{"id":34,"date":"2024-03-29T13:47:23","date_gmt":"2024-03-29T05:47:23","guid":{"rendered":"http:\/\/www.shifengzhi.asia\/?p=34"},"modified":"2024-03-29T13:50:10","modified_gmt":"2024-03-29T05:50:10","slug":"javase%e5%9f%ba%e7%a1%80%e5%85%a5%e9%97%a8","status":"publish","type":"post","link":"https:\/\/boki.shifengzhi.top\/?p=34","title":{"rendered":"JavaSE\u57fa\u7840\u5165\u95e8"},"content":{"rendered":"<h2>Java\u7b80\u4ecb<\/h2>\n<p>Java\u53d1\u5e03\u4e8e1995\u5e745\u670823\u65e5\uff0cJava\u524d\u8eab\u662fOak\u8bed\u8a00\uff0c\u884d\u751f\u81eaC++\uff0cJava\u4e4b\u7236\u662f\u8a79\u59c6\u65af\u00b7\u4e9a\u745f\u00b7\u9ad8\u65af\u6797\uff0cJava\u6700\u65e9\u662fsun\u516c\u53f8\u7684\u4ea7\u54c1\uff0c2009\u5e74\u88abOracle\u516c\u53f8\u6536\u8d2d\uff0c\u73b0\u5c5e\u4e8eOracle\u516c\u53f8\u7684\u4ea7\u54c1\u3002<\/p>\n<h2>Java\u7684\u7248\u672c<\/h2>\n<p>\u6700\u521d\u7248\u672c<\/p>\n<p>\u200b   1995\u5e741.0\u7248\u672c\uff1b1.1\u7248\u672c<\/p>\n<p>Java2\u5e73\u53f0<\/p>\n<p>\u200b   1.2 1.3 1.4 1.5<\/p>\n<p>\u8d70\u51faJava2<\/p>\n<p>6<\/p>\n<p>\u6613\u4e3bOracle<\/p>\n<p>\u200b   2011\u5e747\uff0c8<\/p>\n<p>\u65b0\u7684\u4e3e\u63aa\uff0c\u6bcf\u534a\u5e74\u53d1\u5e03\u4e00\u4e2a\u7248\u672c<\/p>\n<p>9\uff0c 10 \uff0c11 \uff0c12\uff0c....<\/p>\n<h2>Java\u7684\u7248\u672c\u7c7b\u578b<\/h2>\n<p>JavaSE\uff0cJava\u6807\u51c6\u7248\u672c\uff0c\u53ef\u4ee5\u5f00\u53d1Java\u63a7\u5236\u53f0\u7a0b\u5e8f\uff0c\u684c\u9762\u7a0b\u5e8f\u7b49\u3002\u4e3aJavaEE\u63d0\u4f9b\u57fa\u7840          <\/p>\n<p>JavaEE\uff0cJava\u4f01\u4e1a\u7ea7\u7248\u672c\uff0c\u73b0\u4ee5\u6350\u732e\u7ed9eclipse\u57fa\u91d1\u4f1a\uff0c\u6539\u540d\u4e3aJakartaEE\uff08\u96c5\u52a0\u8fbeEE\uff09\u3002\u5b83\u662f\u4e00\u5957\u89c4\u8303\uff0c\u7531\u7b2c\u4e09\u65b9\u5bf9\u4ed6\u5177\u4f53\u5b9e\u73b0\u3002\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u4e00\u822c\u4f7f\u7528\u6846\u67b6\u6765\u4ee3\u66ff\u5b83<\/p>\n<h2>Java\u8bed\u8a00\u7279\u70b9<\/h2>\n<p>1.\u9762\u5411\u5bf9\u8c61<\/p>\n<p>2.\u8de8\u5e73\u53f0<\/p>\n<p>3.\u5065\u58ee\u6027<\/p>\n<p>4.\u7b80\u5355\u6613\u5b66 \u5e9f\u5f03c\u4e2d\u7684\u6307\u9488\u64cd\u4f5c<\/p>\n<p>5.\u591a\u7ebf\u7a0b<\/p>\n<p>6.\u52a8\u6001\u6027<\/p>\n<p>7.\u5206\u5e03\u5f0f<\/p>\n<h2>Java\u5e73\u53f0\u7684\u7ec4\u6210\u90e8\u5206<\/h2>\n<p>JVM\uff1aJava\u865a\u62df\u673a\uff0c\u4f7fJava\u7a0b\u5e8f\u8de8\u5e73\u53f0<\/p>\n<p>JRE\uff1aJava\u8fd0\u884c\u73af\u5883\uff0c\u5305\u542bJVM\u4ee5\u53ca\u5e38\u7528\u7c7b\u5e93\uff0c\u8fd0\u884cJava\u7a0b\u5e8f\u7684\u6700\u5c0f\u5355\u4f4d<\/p>\n<p>JDK\uff1aJava\u5f00\u53d1\u5de5\u5177\u5305\uff0c\u5305\u542bJRE\uff0c\u4ee5\u53ca\u7f16\u8bd1\u5de5\u5177\uff0c\u6253\u5305\u5de5\u5177\uff0c\u5f00\u53d1Java\u7a0b\u5e8f\u7684\u6700\u5c0f\u5355\u4f4d<\/p>\n<p>IDE\uff1a\u96c6\u6210\u5f00\u53d1\u73af\u5883\uff0ceclipse\uff0cMyeclipse\uff0cidea<\/p>\n<h2>\u7b2c\u4e00\u4e2aJava\u7a0b\u5e8f<\/h2>\n<p>\u521b\u5efa\u9879\u76ee\uff1aFile \u2192 New\uff08Other\uff09 \u2192 Java Project \u2192 Project Name \u2192 Finish<\/p>\n<p>\u521b\u5efa\u5305\uff1asrc\u53f3\u952e \u2192 New \u2192 Package \u2192 Name \u2192 Finish<\/p>\n<p>\u521b\u5efa\u7c7b\uff1a\u5728\u5305\u4e0a\u53f3\u952e \u2192 New \u2192 Class \u2192 Name \u2192 Finish<\/p>\n<p><strong>\u6ce8\u91ca\uff1a<\/strong><\/p>\n<p>\u5355\u884c\u6ce8\u91ca\uff1a\/\/<\/p>\n<p>\u591a\u884c\u6ce8\u91ca\uff1a\/<em> <\/em>\/<\/p>\n<p>\u6587\u6863\u6ce8\u91ca\uff1a\/*<em> <\/em>\/<\/p>\n<h2>\u8f93\u51fa\u8bed\u53e5<\/h2>\n<p>1.\u4e0d\u6362\u884c\u8f93\u51fa\uff1aSystem.out.print();<\/p>\n<p>2.\u6362\u884c\u8f93\u51fa\uff1aSystem.out.println();<\/p>\n<h2>\u8f6c\u4e49\u5b57\u7b26<\/h2>\n<p>\u53cc\u5f15\u53f7\uff1a\\ &quot;<\/p>\n<p>\u5355\u5f15\u53f7\uff1a\\ '<\/p>\n<p>\u53cd\u659c\u7ebf\uff1a\\ \\<\/p>\n<p>\u5236\u8868\u7b26\uff1a\\t(Tab\u952e\uff0c\u9002\u5408\u4e0d\u5bf9\u9f50\u8f93\u51fa)<\/p>\n<p>\u6362\u884c\uff1a\\n<\/p>\n<h2>JAVA\u548cJAVAC\u547d\u4ee4\u7684\u4f5c\u7528<\/h2>\n<p>JAVAC\uff1a\u4f5c\u7528\u662f\u5c06.java\u6587\u4ef6\u7f16\u8bd1\u751f\u6210.class\u5b57\u8282\u7801\u6587\u4ef6<\/p>\n<p>JAVA\uff1a\u4f5c\u7528\u5c06.class\u5b57\u8282\u7801\u6587\u4ef6\u89e3\u91ca\u5e76\u6267\u884c<\/p>\n<h2>\u6570\u636e\u7c7b\u578b<\/h2>\n<p>1\u3001\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/p>\n<p>\u6574\u6570\u7c7b\u578b<\/p>\n<p>\u200b   byte                \u5b57\u8282\u578b                     1\u4e2a\u5b57\u8282                          8\u4f4d            \u8303\u56f4\uff1a-128~127<\/p>\n<p>\u200b   short             \u77ed\u6574\u578b                        2\u4e2a\u5b57\u8282                       16\u4f4d      \u8303\u56f4\uff1a-32768~32767<\/p>\n<p>\u200b   int                 \u6574\u578b                          4\u4e2a\u5b57\u8282                        32\u4f4d      \u8303\u56f4\uff1a\u7ea6\u6b63\u8d1f21\u4ebf<\/p>\n<p>\u200b   long                \u957f\u6574\u578b                      8\u4e2a\u5b57\u8282                       64\u4f4d     \u8303\u56f4\uff1a\u7ea6\u4e3a\u6b63\u8d1f922\u4ebf\u4ebf        \u540e\u7f00\uff1aL\u6216l<\/p>\n<p>\u6d6e\u70b9\u7c7b\u578b<\/p>\n<p>\u200b   float               \u5355\u7cbe\u5ea6                     4\u4e2a\u5b57\u8282                        32\u4f4d         \u540e\u7f00\uff1aF\u6216f<\/p>\n<p>\u200b   double          \u53cc\u7cbe\u5ea6                     8\u4e2a\u5b57\u8282                        64\u4f4d         \u540e\u7f00\uff1aD\u6216d<\/p>\n<p>\u5b57\u7b26\u7c7b\u578b<\/p>\n<p>\u200b   char                \u5b57\u7b26\u578b                     2\u4e2a\u5b57\u8282                        16\u4f4d             \u8303\u56f4\uff1a0~65535\uff08\\u0000~\\uFFFF\uff09<\/p>\n<p>\u5e03\u5c14\u7c7b\u578b<\/p>\n<p>\u200b   boolean         \u5e03\u5c14\u578b                 1\u4e2a\u62164\u4e2a                       8\u621632\u4f4d           \u503c\uff1atrue  false<\/p>\n<p>2\u3001\u5f15\u7528\u6570\u636e\u7c7b\u578b<\/p>\n<p>\u7c7b\u7c7b\u578b\uff08class\uff09<\/p>\n<p>\u200b   \u5b57\u7b26\u4e32(String)\uff0c\u591a\u4e2a\u5b57\u7b26\u7ec4\u6210\u4e86\u5b57\u7b26\u4e32\uff0c\u7528\u53cc\u5f15\u53f7\u8868\u793a\uff0c\u5982&quot;\u9ad8\u65af\u6797&quot;<\/p>\n<p>\u6570\u7ec4\u7c7b\u578b\uff08array\uff09<\/p>\n<p>\u63a5\u53e3\u7c7b\u578b\uff08interface\uff09<\/p>\n<p>\u679a\u4e3e\u7c7b\u578b\uff08enum\uff09<\/p>\n<p>\u6ce8\u89e3\u7c7b\u578b\uff08annotation\uff09<\/p>\n<h2>\u53d8\u91cf<\/h2>\n<p>\u7a0b\u5e8f\u4e2d\u53ef\u4ee5\u6539\u53d8\u7684\u91cf<\/p>\n<p>\u53d8\u91cf\u7684\u4e09\u5927\u8981\u7d20\uff08\u4e09\u5927\u7ec4\u6210\u90e8\u5206\uff09<\/p>\n<p>\u6570\u636e\u7c7b\u578b  \u53d8\u91cf\u540d  \u53d8\u91cf\u503c<\/p>\n<p>1.\u58f0\u660e\u53d8\u91cf\uff1a\u6570\u636e\u7c7b\u578b \u53d8\u91cf\u540d\uff1bint a;<\/p>\n<p>2.\u53d8\u91cf\u8d4b\u503c\uff1a\u53d8\u91cf\u540d = \u503c\uff1b a = 10;<\/p>\n<p>\u5408\u5e76\uff1a\u6570\u636e\u7c7b\u578b \u53d8\u91cf\u540d = \u503c; int a = 10;<\/p>\n<p>3.\u58f0\u660e\u591a\u4e2a\u540c\u4e00\u7c7b\u578b\u7684\u53d8\u91cf<\/p>\n<p>\u6570\u636e\u7c7b\u578b  \u53d8\u91cf\u540d1,\u53d8\u91cf\u540d2,...<\/p>\n<p><strong>\u53d8\u91cf\u540d\u7684\u5efa\u8bae\u89c4\u8303<\/strong><\/p>\n<p>\u53d8\u91cf\u540d\u9075\u5faa\u9a7c\u5cf0\u547d\u540d\u6cd5\uff0c\u5373\u9996\u5b57\u6bcd\u5c0f\u5199\uff0c\u5176\u540e\u6bcf\u4e2a\u5355\u8bcd\u9996\u5b57\u6bcd\u5927\u5199\uff0cstrScore<\/p>\n<p>\u4e0d\u5efa\u8bae\u4f7f\u7528\u6c49\u5b57\uff0c\u5c3d\u91cf\u4f7f\u7528\u82f1\u6587\u5355\u8bcd\u6216\u62fc\u97f3\uff0c\u8981\u89c1\u540d\u77e5\u610f<\/p>\n<p>\u4e0d\u5efa\u8bae\u4f7f\u7528\u5355\u4e2a\u5b57\u6bcd\u547d\u540d\uff0c\u7ea6\u5b9a\u4fd7\u6210\u7684\u9664\u5916<\/p>\n<p>\u4e0d\u5efa\u8bae\u4ee5\u4e0b\u5212\u7ebf\u5f00\u5934\uff0c\u4e0d\u5efa\u8bae\u4f7f\u7528$<\/p>\n<p>\u547d\u540d\u6cd5\uff1a<\/p>\n<p>\u9a7c\u5cf0\u547d\u540d\u6cd5\uff1aclassId<\/p>\n<p>\u5e15\u65af\u5361\u547d\u540d\u6cd5\uff1aClassId<\/p>\n<p>\u86c7\u5e95\u5f0f\u547d\u540d\u6cd5\uff1aclass_id<\/p>\n<p>\u5c16\u53eb\u86c7\u5e95\u5f0f\u547d\u540d\u6cd5\uff1aCLASS_ID<\/p>\n<p><strong>\u6807\u8bc6\u7b26\u5f3a\u5236\u89c4\u8303<\/strong><\/p>\n<p>1.\u53ef\u7531\u5b57\u6bcd\uff0c\u6570\u5b57\uff0c\u4e0b\u5212\u7ebf\uff0c$\u7ec4\u6210<\/p>\n<p>2.\u4e0d\u80fd\u4ee5\u6570\u5b57\u5f00\u5934<\/p>\n<p>3.\u5b57\u6bcd\u533a\u5206\u5927\u5c0f\u5199<\/p>\n<p>4.\u4e0d\u80fd\u4f7f\u7528\u5173\u952e\u5b57\uff0c\u5b57\u9762\u91cf\uff0c\u4fdd\u7559\u5b57<\/p>\n<p>5.\u5728\u540c\u4e00\u4f5c\u7528\u57df\u4e0b\u540d\u79f0\u4e0d\u80fd\u91cd\u540d<\/p>\n<p>\u5173\u952e\u5b57\uff1a\u662fJava\u5b9a\u4e49\u597d\u7684\u5177\u6709\u7279\u5b9a\u542b\u4e49\u7684\u5355\u8bcd\uff0cpublic ,class ,int...<\/p>\n<p>\u5b57\u9762\u91cf\uff1a\u662fJava\u5b9a\u4e49\u597d\u7684\u4e00\u4e9b\u503c\uff1atrue\uff0cfalse\uff0cnull<\/p>\n<p>\u4fdd\u7559\u5b57\uff1a\u662fJava\u7684\u524d\u8eabOak\u548c\u524d\u4ee3\u8bed\u8a00C\u3001C++\u7684\u5173\u952e\u5b57\uff0c\u4f46\u662f\u5728Java\u4e2d\u6ca1\u6709\u4f7f\u7528\u5374\u4fdd\u7559\u4e0b\u6765\u7684\uff0cconst\uff0cgoto<\/p>\n<h2>\u63a7\u5236\u53f0\u8f93\u5165<\/h2>\n<p>Scanner\u662f\u7528\u6765\u8f93\u5165\u7684\uff0c\u9996\u5148\u5b9a\u4e49\u4e00\u4e2aScanner<\/p>\n<p>\u200b   Scanner sc = new Scanner(System.in);<\/p>\n<p>\u5bfc\u5165Scanner<\/p>\n<p>\u200b   1.\u5728package\u4e0b\u9762\uff0c\u5199\u4e0aimport java.util.Scanner;<\/p>\n<p>\u200b   2.\u5c06\u9f20\u6807\u653e\u5728Scanner\u4e0a\u9762\uff0c\u6839\u636e\u63d0\u793a\uff0c\u9009\u62e9...<\/p>\n<p>\u200b   3.\u5c06\u5149\u6807\u653e\u5728Scanner\u540e\u9762\uff0c\u6309Alt+\/(?)<\/p>\n<p>\u200b   4.\u4f7f\u7528\u5feb\u6377\u952e:\u6309Ctrl+Shift+o\uff0c\u4f1a\u81ea\u52a8\u5bfc\u5165\u6240\u6709\u6240\u9700\u8981\u7684\u7c7b<\/p>\n<p>\u4e00\u822c\u8bed\u6cd5\uff1asc.next\u7c7b\u578b()\uff0c\u7c7b\u578b\u8981\u6c42\u9996\u5b57\u6bcd\u5927\u5199<\/p>\n<p>\u200b   \u8f93\u5165double\u7c7b\u578b\uff1asc.nextDouble()<\/p>\n<p>\u200b   \u8f93\u5165int\u7c7b\u578b\uff1asc.nextInt()<\/p>\n<p>\u200b   \u8f93\u5165\u5b57\u7b26\u4e32String\uff1asc.next()<\/p>\n<p>\u6ca1\u6709char\u7c7b\u578b\u7684\u8f93\u5165<\/p>\n<h2>\u7c7b\u578b\u8f6c\u6362<\/h2>\n<p>1.\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\uff08\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\uff09<\/p>\n<p>\u200b   \u8303\u56f4\u5c0f\u7684\u7c7b\u578b\u8f6c\u5230\u8303\u56f4\u5927\u7684\u7c7b\u578b<\/p>\n<p>2.\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362<\/p>\n<p>\u200b   \u8303\u56f4\u5927\u7684\u7c7b\u578b\u8f6c\u5230\u8303\u56f4\u5c0f\u7684\u7c7b\u578b<\/p>\n<p>\u200b   (\u60f3\u8981\u8f6c\u5230\u7684\u7c7b\u578b)\u53d8\u91cf<\/p>\n<p>\u200b   \u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u53ef\u80fd\u51fa\u73b0\u6ea2\u51fa\uff08\u7cbe\u5ea6\u4e22\u5931\uff09<\/p>\n<p>3.\u5728\u516b\u5927\u57fa\u672c\u7c7b\u578b\u4e2d\uff0c\u9664\u4e86boolean\u4e4b\u5916\u7684\u4e03\u79cd\u7c7b\u578b\u90fd\u53ef\u4ee5\u4e92\u76f8\u8f6c\u6362<\/p>\n<p><strong>\u5b57\u7b26\u4e32\u8f6c\u57fa\u672c\u7c7b\u578b<\/strong><\/p>\n<p>\u200b   \u4e00\u822c\u8bed\u6cd5\uff1a\u6570\u636e\u7c7b\u578b.parse\u6570\u636e\u7c7b\u578b(\u5b57\u7b26\u4e32)\uff0c\u6570\u636e\u7c7b\u578b\u9996\u5b57\u6bcd\u5927\u5199<\/p>\n<p>\u200b       double score = Double.parseDouble(strScore);<\/p>\n<p>\u200b   1.\u5b57\u7b26\u4e32\u8f6cint\u7c7b\u578b\uff1aInteger.parseInt(\u5b57\u7b26\u4e32);<br \/>\n\u200b       int port = Integer.parseInt(strPort);<\/p>\n<p>\u200b   2.\u5bf9\u4e8e\u5b57\u7b26\u4e32\u8f6c\u5e03\u5c14\u7c7b\u578b\uff0c\u5982\u679c\u5b57\u7b26\u4e32\u662ftrue(\u4e0d\u533a\u5206\u5927\u5c0f\u5199)\uff0c\u5219\u7ed3\u679c\u4e3atrue\uff0c\u5426\u5219\u4e3afalse<\/p>\n<p>\u200b   3.\u6ca1\u6709\u8f6c\u6210char\u7c7b\u578b\u7684\u65b9\u6cd5<br \/>\n<strong>\u57fa\u672c\u7c7b\u578b\u8f6c\u5b57\u7b26\u4e32<\/strong><\/p>\n<p>\u200b   &quot;&quot;+\u57fa\u672c\u7c7b\u578b\u53d8\u91cf\u6216\u6570\u503c<\/p>\n<h2>\u8fd0\u7b97\u7b26<\/h2>\n<p>\u7b97\u672f\u8fd0\u7b97\u7b26\uff0c\u8d4b\u503c\u8fd0\u7b97\u7b26\uff0c\u5173\u7cfb\u8fd0\u7b97\u7b26\uff0c\u903b\u8f91\u8fd0\u7b97\u7b26\uff0c\u6761\u4ef6\u8fd0\u7b97\u7b26<\/p>\n<p>\u3010\u7b97\u672f\u8fd0\u7b97\u7b26\u3011<\/p>\n<p>\u200b   +\u3001-\u3001*\u3001\/\u3001%\u3001++\u3001--<\/p>\n<p>\u200b   1.\u4e24\u4e2a\u6574\u6570\u76f8\u9664\u7684\u7ed3\u679c\u662f\u6574\u6570\uff08\u5373\u6574\u9664\uff09\uff0c\u82e5\u60f3\u5f97\u5230\u5c0f\u6570\u7ed3\u679c\uff0c\u9700\u8981\u5c06\u5176\u4e2d\u4e00\u4e2a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u6210\u6d6e\u70b9\u6570<\/p>\n<p>\u200b   2.\u5229\u7528\u6574\u9664\u53ef\u4ee5\u53bb\u6389\u6700\u540e\u4e00\u4f4d\uff1a\u6574\u6570\/10<\/p>\n<p>\u200b   3.\u6d6e\u70b9\u7c7b\u578b\u7684\u8ba1\u7b97\u4e0d\u4e00\u5b9a\u7cbe\u51c6(\u52a0\u51cf\u4e58\u9664%)<\/p>\n<p>\u200b   4.\u53d6\u4f59\u6570<\/p>\n<p>\u200b       1\uff09\u8d1f\u6570\u53d6\u4f59\u6570\uff0c\u4ee5\u7b2c\u4e00\u4e2a\u6570\u7684\u6b63\u8d1f\u4e3a\u51c6\uff0c\u82e5\u7b2c\u4e00\u4e2a\u6570\u662f\u6b63\u6570\uff0c\u5219\u7ed3\u679c\u4e3a\u6b63\uff0c\u82e5\u7b2c\u4e00\u4e2a\u6570\u662f\u8d1f\u6570\uff0c\u5219\u7ed3\u679c\u4e3a\u8d1f<\/p>\n<p>\u200b       2\uff09\u5224\u65ad\u5947\u5076\uff0c\u6570%2\uff0c\u82e5\u7ed3\u679c\u662f0\u5219\u662f\u5076\u6570\uff0c\u82e5\u7ed3\u679c\u975e0\u5219\u662f\u5947\u6570<\/p>\n<p>\u200b       3\uff09\u83b7\u53d6\u6574\u6570\u7684\u6700\u540e\u4e00\u4f4d\uff1a\u6574\u6570%10<\/p>\n<p>\u200b       4\uff09\u5224\u65ad\u6574\u6570\uff1a\u6570%1\uff0c\u82e5\u7ed3\u679c\u662f0\u5219\u662f\u6574\u6570\uff0c\u82e5\u7ed3\u679c\u975e0\u5219\u662f\u5947\u6570<\/p>\n<p>\u200b   5.\u4e24\u79cd\u7c7b\u578b\u8fdb\u884c\u8ba1\u7b97\u7684\u7ed3\u679c<\/p>\n<p>\u200b       1\uff09\u90fd\u662f\u6574\u6570\u7c7b\u578b\uff0c\u82e5\u7531long\u7c7b\u578b\u53c2\u4e0e\uff0c\u5219\u7ed3\u679c\u4e3along\u7c7b\u578b\uff0c\u5426\u5219\u4e3aint\u7c7b\u578b<\/p>\n<p>\u200b       2\uff09\u82e5\u6709\u6d6e\u70b9\u7c7b\u578b\u53c2\u4e0e\uff0c\u5982\u679c\u6709double\u7c7b\u578b\u53c2\u4e0e\uff0c\u5219\u7ed3\u679c\u4e3adouble\u7c7b\u578b\uff0c\u5426\u5219\u4e3afloat\u7c7b\u578b<\/p>\n<p>\u200b   6.\u9664\u4e86boolean\u4e4b\u5916\u7684\u4e03\u79cd\u7c7b\u578b\uff0c\u90fd\u53ef\u4ee5\u8fdb\u884c\u7b97\u672f\u8fd0\u7b97<\/p>\n<p>\u200b   7.++\u3001--<\/p>\n<p>\u200b   ++\uff1a\u81ea\u52a01    --\u81ea\u51cf1<\/p>\n<p>\u200b   a++\uff1a\u5148\u7528\u540e\u52a0<\/p>\n<p>\u200b   ++a\uff1a\u5148\u52a0\u540e\u7528<\/p>\n<pre><code class=\"language-java\">        \/\/ \u4e60\u9898\n        int i=1;\n        \/\/int c = i++ + ++i;\n        int a = i++;\/\/a=1 i=2\n        int b = ++i;\/\/b=3 i=3\n        int c = a+b;\/\/c=4\n        System.out.println(i);\n        System.out.println(c);\n\n        int x = 1;\n        x = x++;\n        x = x++;\n        x = x++;\n        \/\/ ...\n        System.out.println(x);\/\/ \u503c\u6c38\u8fdc\u4e0d\u53d8<\/code><\/pre>\n<p>\u3010\u8d4b\u503c\u8fd0\u7b97\u7b26\u3011<\/p>\n<p>\u200b   1.\u7b80\u5355\u8d4b\u503c\u8fd0\u7b97\u7b26(\u666e\u901a\u8d4b\u503c\u8fd0\u7b97\u7b26)\uff1a=<\/p>\n<p>\u200b   2.\u590d\u5408\u8d4b\u503c\u8fd0\u7b97\u7b26\uff1a+= -= *= \/= %=<\/p>\n<p>\u200b   short a = 1;<\/p>\n<p>\u200b   a+=2;\/\/a\u53d8\u4e3a3<\/p>\n<p>\u200b   a+=2\u548ca=a+2\u5e76\u4e0d\u5b8c\u5168\u4e00\u6837\uff0ca+=2\u91cc\u8fb9\u5b58\u5728\u4e00\u4e2a\u9690\u5f0f\u7684\u7c7b\u578b\u8f6c\u6362<\/p>\n<p>\u200b   \u76f8\u5f53\u4e8ea=(a\u7684\u7c7b\u578b)(a+2)\uff0c\u7ed3\u679c\u662f+=\u5de6\u8fb9\u7684\u7c7b\u578b<\/p>\n<pre><code class=\"language-java\">        \/\/ \u5b8c\u6210\u4e24\u503c\u4ea4\u6362\n        int x = 1;\n        int y = 9;\n        int z = x;\/\/z=1\n        x = y;\/\/x=9\n        y = z;\/\/y=1\n        System.out.println(x);\/\/9\n        System.out.println(y);\/\/1\n\n        short a = 1;\n        \/\/a += 2;\n        a = (short)(a+2);\n        System.out.println(a);<\/code><\/pre>\n<p>\u3010\u5173\u7cfb\u8fd0\u7b97\u7b26\u3011<\/p>\n<pre><code> \/\/&gt;,&gt;=,&lt;,&lt;=,==\uff08\u7b49\u4e8e\uff09,!=(\u4e0d\u7b49\u4e8e)\u3002\u7ed3\u679c\u662f\u5e03\u5c14\u7c7b\u578b<\/code><\/pre>\n<p>\u3010\u903b\u8f91\u8fd0\u7b97\u7b26\u3011<\/p>\n<p>\u200b   \u4e0e   \u6216   \u975e<\/p>\n<p>\u200b   \u4e0e\uff1a\u5e76\u4e14\uff0c\u5982\u679c\u4e24\u4e2a\u6761\u4ef6\u540c\u65f6\u4e3atrue\uff0c\u5219\u7ed3\u679c\u662ftrue<\/p>\n<p>\u200b   &amp;&amp;\uff1a\u77ed\u8def\u4e0e\uff0c\u5982\u679c\u7b2c\u4e00\u4e2a\u6761\u4ef6\u4e3afalse\uff0c\u5219\u4e0d\u4f1a\u5224\u65ad\u7b2c\u4e8c\u4e2a\u6761\u4ef6<\/p>\n<p>\u200b   &amp;\uff1a\u975e\u77ed\u8def\u4e0e\uff0c\u5373\u4f7f\u7b2c\u4e00\u4e2a\u6761\u4ef6\u4e3afalse\uff0c\u4e5f\u4f1a\u5224\u65ad\u7b2c\u4e8c\u4e2a\u6761\u4ef6<\/p>\n<p>\u200b   \u6216\uff1a\u6216\u8005\uff0c\u5982\u679c\u6709\u4e00\u4e2a\u6761\u4ef6\u4e3atrue\uff0c\u5219\u7ed3\u679c\u4e3atrue<\/p>\n<p>\u200b   ||\uff1a\u77ed\u8def\u6216\uff0c\u5982\u679c\u7b2c\u4e00\u4e2a\u6761\u4ef6\u4e3atrue\uff0c\u5219\u4e0d\u4f1a\u5224\u65ad\u7b2c\u4e8c\u4e2a\u6761\u4ef6<\/p>\n<p>\u200b   |\uff1a\u975e\u77ed\u8def\u6216\uff0c\u5373\u4f7f\u7b2c\u4e00\u4e2a\u6761\u4ef6\u4e3atrue\uff0c\u4e5f\u4f1a\u5224\u65ad\u7b2c\u4e8c\u4e2a\u6761\u4ef6<\/p>\n<p>\u200b   \u975e\uff1a\u53d6\u53cd    \uff01<\/p>\n<p>\u3010\u6761\u4ef6\u8fd0\u7b97\u7b26\u3011<\/p>\n<p>\u200b   ? :<\/p>\n<p>\u200b   \u5e03\u5c14\u7c7b\u578b\u8868\u8fbe\u5f0f ? \u7ed3\u679c\u4e3atrue\u5219\u6267\u884c\u6b64\u90e8\u5206 : \u5426\u5219\u6267\u884c\u6b64\u90e8\u5206<\/p>\n<pre><code class=\"language-java\">    \/\/ \u6c42a\uff0cb\uff0cc\u7684\u6700\u5927\u503c\n        int a = 50;\n        int b = 10;\n        int c = 30;\n\n        int max;\n        \/\/ \u65b9\u5f0f\u4e00\n\/\/      max = a &gt; b ? a : b;\n\/\/      max = max &gt; c ? max : c;\n        \/\/ \u65b9\u5f0f\u4e8c\n        max = (a &gt; b ? a : b) &gt; c ? (a &gt; b ? a : b) : c;\n        System.out.println(max);<\/code><\/pre>\n<p>\u3010\u6309\u64cd\u4f5c\u6570\u5212\u5206\u3011<\/p>\n<p>\u4e00\u5143\u8fd0\u7b97\u7b26\uff08\u5355\u76ee\u8fd0\u7b97\u7b26\uff09\uff1a\u53ea\u6709\u4e00\u4e2a\u64cd\u4f5c\u6570\uff0c\u5982\uff1aa++\uff0c-1<\/p>\n<p>\u4e8c\u5143\u8fd0\u7b97\u7b26\uff08\u53cc\u76ee\u8fd0\u7b97\u7b26\uff09\uff1a\u6709\u4e24\u4e2a\u64cd\u4f5c\u6570\uff0c\u5982a+b<\/p>\n<p>\u4e09\u5143\u8fd0\u7b97\u7b26\uff08\u4e09\u76ee\u8fd0\u7b97\u7b26\uff09\uff1a\u6709\u4e09\u4e2a\u64cd\u4f5c\u6570\uff0c\u5373?:<\/p>\n<h2>\u5feb\u6377\u952e<\/h2>\n<p>\u4e07\u80fd\u952e\uff1aalt+\/(?)  main=&gt;\u4e3b\u65b9\u6cd5<\/p>\n<p>\u590d\u5236\uff1actrl+c<\/p>\n<p>\u7c98\u8d34\uff1actrl+v<\/p>\n<p>\u526a\u5207\uff1actrl+x<\/p>\n<p>\u64a4\u56de\uff1actrl+z<\/p>\n<p>\u5220\u9664\u4e00\u884c\uff1actrl+d<\/p>\n<p>\u4fdd\u5b58\uff1actrl+s<\/p>\n<p>\u5355\u884c\u6ce8\u91ca\uff1actrl+\/(?)<\/p>\n<p>\u591a\u884c\u6ce8\u91ca\uff1actrl+shift+\/(?)<\/p>\n<p>\u53d8\u6210\u5927\u5199\uff1actrl+shift+x<\/p>\n<p>\u53d8\u6210\u5c0f\u5199\uff1actrl+shift+y<\/p>\n<h2>\u6d41\u7a0b\u63a7\u5236<\/h2>\n<p>1\u3001\u987a\u5e8f\u6267\u884c<\/p>\n<h3>\u5206\u652f\u8bed\u53e5<\/h3>\n<p>if\u3001switch<\/p>\n<p>if<\/p>\n<p>\u4e00\u3001\u5355\u5206\u652f<\/p>\n<p>if(\u6761\u4ef6){<\/p>\n<p>\u200b   \/\/ \u5982\u679c\u6761\u4ef6\u4e3atrue\uff0c\u5219\u6267\u884c\u6b64\u90e8\u5206\u4ee3\u7801<\/p>\n<p>}<\/p>\n<p>\u4e8c\u3001\u53cc\u5206\u652f<\/p>\n<p>if(\u6761\u4ef6){<\/p>\n<p>\u200b   \/\/ \u5982\u679c\u6761\u4ef6\u4e3atrue\uff0c\u5219\u6267\u884c\u6b64\u90e8\u5206\u4ee3\u7801<\/p>\n<p>}else{<\/p>\n<p>\u200b   \/\/ \u5426\u5219\u6267\u884c\u6b64\u90e8\u5206<\/p>\n<p>}<\/p>\n<p>\u4e09\u3001\u591a\u5206\u652f<\/p>\n<p>if(\u6761\u4ef61){<\/p>\n<p>\u200b   \/\/ \u5982\u679c\u6761\u4ef61\u4e3atrue\uff0c\u5219\u6267\u884c\u6b64\u90e8\u5206\u4ee3\u7801\uff0c\u4e0d\u4f1a\u5224\u65ad\u4e0b\u9762\u7684\u6761\u4ef6<\/p>\n<p>}else if(\u6761\u4ef62){<\/p>\n<p>\u200b   \/\/ \u5982\u679c\u6761\u4ef62\u4e3atrue\uff0c\u5219\u6267\u884c\u6b64\u90e8\u5206\u4ee3\u7801\uff0c\u4e0d\u4f1a\u5224\u65ad\u4e0b\u9762\u7684\u6761\u4ef6<\/p>\n<p>}...else{<\/p>\n<p>\u200b   \/\/ \u5982\u679c\u4ee5\u4e0a\u6761\u4ef6\u90fd\u4e0d\u6ee1\u8db3\uff0c\u5219\u6267\u884c\u6b64\u90e8\u5206\u4ee3\u7801<\/p>\n<p>}<\/p>\n<p>\u5f53\u4ee3\u7801\u5757\u8bed\u53e5\u662f\u4e00\u53e5\u6267\u884c\u8bed\u53e5\u65f6\uff0c{}\u53ef\u4ee5\u7701\u7565\u4e0d\u5199<\/p>\n<p><strong>switch\uff1a\u5f00\u5173\u8bed\u53e5<\/strong><\/p>\n<p>switch(\u53d8\u91cf){<\/p>\n<p>case \u503c1:<\/p>\n<p>\u200b   \/\/ \u5982\u679c\u53d8\u91cf\u548c\u503c1\u76f8\u7b49\uff0c\u5219\u6267\u884c\u6b64\u90e8\u5206\u4ee3\u7801<\/p>\n<p>\u200b   break;<\/p>\n<p>case \u503c2:<\/p>\n<p>\u200b   \/\/ \u5982\u679c\u53d8\u91cf\u548c\u503c2\u76f8\u7b49\uff0c\u5219\u6267\u884c\u6b64\u90e8\u5206\u4ee3\u7801<\/p>\n<p>\u200b   break;<\/p>\n<p>...<\/p>\n<p>default:<\/p>\n<p>\u200b   \/\/ \u5982\u679c\u53d8\u91cf\u548c\u4ee5\u4e0a\u503c\u90fd\u4e0d\u76f8\u7b49\uff0c\u5219\u6267\u884c\u6b64\u90e8\u5206\u4ee3\u7801<\/p>\n<p>}<\/p>\n<p>\u6ce8\u610f\uff1a<\/p>\n<p>\u200b   1.case\u8d2f\u7a7f\uff1a\u5982\u679c\u6ca1\u6709break\uff0c\u4f1a\u7ee7\u7eed\u6267\u884c\uff0c\u76f4\u5230\u9047\u5230\u4e00\u4e2abreak\u6216\u8005\u7a0b\u5e8f\u7ed3\u675f<\/p>\n<p>\u200b   2.case\u540e\u9762\u5fc5\u987b\u662f\u4e00\u4e2a\u5177\u4f53\u7684\u503c\uff0c\u4e0d\u80fd\u662f\u53d8\u91cf\uff0c\u4e5f\u4e0d\u80fd\u662f\u591a\u4e2a\u503c\uff0c\u4e5f\u4e0d\u80fd\u8868\u793a\u8303\u56f4<\/p>\n<p>\u200b   3.case\u7684\u503c\u4e0d\u80fd\u91cd\u590d<\/p>\n<p>\u200b   4.switch\u652f\u6301\u76846\u79cd\u7c7b\u578b\uff1abyte\uff0cshort\uff0cint\uff0cchar\uff0cString(Java 7)\uff0c\u679a\u4e3e(Java 5)<\/p>\n<h3>\u5faa\u73af<\/h3>\n<p>1.while\u5faa\u73af   2.for\u5faa\u73af 3.do-while  4.\u65b0\u578bfor\u5faa\u73af<\/p>\n<p><strong>while\u5faa\u73af<\/strong><\/p>\n<p>\u786e\u5b9a\u5faa\u73af\u6b21\u6570<\/p>\n<p>1.\u521d\u59cb\u53d8\u91cf<\/p>\n<p>while(2.\u5faa\u73af\u6761\u4ef6){<\/p>\n<p>\u200b   3.\u5faa\u73af\u4f53<\/p>\n<p>\u200b   4.\u8fed\u4ee3\u56e0\u5b50<\/p>\n<p>}<\/p>\n<p>\u6267\u884c\u987a\u5e8f\uff1a1234   234     234...<\/p>\n<p><strong>for\u5faa\u73af<\/strong><\/p>\n<p>for(1.\u521d\u59cb\u53d8\u91cf;2.\u5faa\u73af\u6761\u4ef6;4.\u8fed\u4ee3\u56e0\u5b50){<\/p>\n<p>\u200b   3.\u5faa\u73af\u4f53<\/p>\n<p>}<\/p>\n<p>\u6267\u884c\u987a\u5e8f\uff1a1234 234 234...<\/p>\n<p>\u5e94\u7528\u573a\u666f\uff1a<\/p>\n<p>1.for\u5faa\u73af\u9002\u5408\u786e\u5b9a\u5faa\u73af\u6b21\u6570\u7684\u573a\u666f<\/p>\n<p>2.while\u5faa\u73af\u9002\u5408\u4e0d\u786e\u5b9a\u5faa\u73af\u6b21\u6570\u7684\u573a\u666f<\/p>\n<p><strong>\u5faa\u73af\u63a7\u5236<\/strong><\/p>\n<p>1.break\uff1a\u7ec8\u6b62\u6574\u4e2a\u5faa\u73af <\/p>\n<p>2.continue\uff1a\u7ec8\u6b62\u672c\u6b21\u5faa\u73af\uff0c\u8fd8\u4f1a\u6267\u884c\u4e0b\u6b21\u5faa\u73af<\/p>\n<p><strong>do-while<\/strong><\/p>\n<p>1.\u521d\u59cb\u53d8\u91cf<\/p>\n<p>do{<\/p>\n<p>\u200b   3.\u5faa\u73af\u4f53<\/p>\n<p>\u200b   4.\u8fed\u4ee3\u56e0\u5b50<\/p>\n<p>}while(2.\u5faa\u73af\u6761\u4ef6);<\/p>\n<p>\u6267\u884c\u987a\u5e8f\uff1a1342   342 ...\u3001<\/p>\n<p>do while\u5faa\u73af\u81f3\u5c11\u6267\u884c\u4e00\u6b21<\/p>\n<h2>\u6570\u7ec4<\/h2>\n<p>1.\u58f0\u660e\u6570\u7ec4\uff1a\u6570\u636e\u7c7b\u578b[] \u6570\u7ec4\u540d\uff1b<\/p>\n<p>\u200b                       \u6570\u636e\u7c7b\u578b \u6570\u7ec4\u540d[]; \u4e0d\u63a8\u8350<\/p>\n<p>2.\u5b9e\u4f8b\u5316\u6570\u7ec4\uff1a\u6570\u7ec4\u540d = new \u6570\u636e\u7c7b\u578b[\u957f\u5ea6];<\/p>\n<p>\u5408\u5e76\uff1a\u58f0\u660e\u5e76\u5b9e\u4f8b\u5316\u5bf9\u8c61\uff1a\u6570\u636e\u7c7b\u578b[] \u6570\u7ec4\u540d = new \u6570\u636e\u7c7b\u578b[\u957f\u5ea6];<\/p>\n<p>\u200b   \u6ce8\u610f\uff1a\u6570\u7ec4\u957f\u5ea6\u662fint\u7c7b\u578b<\/p>\n<p>3.\u4f7f\u7528\u6570\u7ec4<\/p>\n<p>\u200b   1\uff09\u4e3a\u5143\u7d20\u8d4b\u503c\uff1a\u6570\u7ec4\u540d[\u7d22\u5f15] = \u503c<\/p>\n<p>\u200b       \u7d22\u5f15\uff0c\u4e0b\u6807\uff0c\u4e0b\u89d2\u6807\uff0c\u89d2\u6807\uff0c\u4ece0\u5f00\u59cb\uff0c\u6700\u5927\u7d22\u5f15\u6bd4\u957f\u5ea6\u5c0f1<\/p>\n<p>\u200b   2\uff09\u83b7\u53d6\u5143\u7d20\u503c\uff1a\u6570\u7ec4\u540d[\u7d22\u5f15]<\/p>\n<p>4.\u6570\u7ec4\u957f\u5ea6\uff1a\u6570\u7ec4\u540d.length<\/p>\n<pre><code class=\"language-java\">\n        int[] scores = new int[3];\n        scores[0] = 90;\n        scores[1] = 80;\n        scores[2] = 99;\n\n        \/\/\u904d\u5386\u6570\u7ec4\n        \/\/\u65b9\u5f0f\u4e00\n\/\/      for (int i = 0; i &lt; scores.length; i++) {\n\/\/          System.out.println(scores[i]);\n\/\/      }\n\n        \/*\n         *  \u65b0\u578bfor\u5faa\u73af\uff0c\u589e\u5f3afor\u5faa\u73af\uff0cforeach\u5faa\u5e8f\uff0c\u8fed\u4ee3\u5faa\u73af\uff0cfor\u5faa\u73af\n         *  for(\u5143\u7d20\u7684\u6570\u636e\u7c7b\u578b  \u53d8\u91cf\u540d : \u6570\u7ec4\u540d){\n         *      \/\/ \u6bcf\u6b21\u5faa\u73af\uff0c\u53d8\u91cf\u7684\u503c\uff0c\u5c31\u662f\u6570\u7ec4\u4e2d\u6bcf\u4e2a\u5143\u7d20\u503c\n         *  }\n         *\/\n        \/\/ \u65b9\u5f0f\u4e8c\n        for(int score : scores) {\n            System.out.println(score);\n        }<\/code><\/pre>\n<p>5.\u6570\u7ec4\u9ed8\u8ba4\u503c<\/p>\n<p>\u6574\u6570\u7c7b\u578b\uff1a0<\/p>\n<p>\u200b   byte:byte(0)<\/p>\n<p>\u200b   short:short(0)<\/p>\n<p>\u200b   int:0<\/p>\n<p>\u200b   long:0L<\/p>\n<p>\u6d6e\u70b9\u7c7b\u578b\uff1a0.0<\/p>\n<p>\u200b   float:0.0F<\/p>\n<p>\u200b   double:0.0<\/p>\n<p>\u5b57\u7b26\u7c7b\u578b\uff1achar \\u0000,\u5b9e\u9645\u4e0a\u5c31\u662f0<\/p>\n<p>\u5e03\u5c14\u7c7b\u578b\uff1afalse<\/p>\n<p>\u5b57\u7b26\u4e32\uff1anull<\/p>\n<p>6.\u6570\u7ec4\u521d\u59cb\u5316<\/p>\n<p>1.\u6570\u636e\u7c7b\u578b[] \u6570\u7ec4\u540d = new \u6570\u636e\u7c7b\u578b[]{\u503c1,\u503c2,...};<\/p>\n<p>2.\u6570\u636e\u7c7b\u578b[] \u6570\u7ec4\u540d = {\u503c1,\u503c2,...};\u6b64\u65b9\u5f0f\u53ea\u80fd\u5728\u58f0\u660e\u6570\u7ec4\u65f6\u4f7f\u7528<\/p>\n<p>ArrayIndexOutOfBoundsException  \u4e0b\u6807\u8d8a\u754c\u5f02\u5e38<\/p>\n<p><strong>\u5192\u6ce1\u6392\u5e8f<\/strong><\/p>\n<pre><code class=\"language-java\">    public static void main(String[] args) {\n        int[] arr = { 25, 16, 7, 51, 65, 78, 91, 1 };\n        for (int i = 0; i &lt; arr.length-1; i++) {\n            \/*\n             * i    7-i\n             * 0    7\n             * 1    6\n             * 2    5\n             * 3    4\n             * 4    3\n             * 5    2\n             * 6    1\n             *\/\n            for(int j=0; j&lt;arr.length-1-i; j++) {\n                \/\/ \u4ea4\u6362   \u5c0f-\u300b\u5927\n                if(arr[j] &gt; arr[j+1]) {\n                    int temp = arr[j];\n                    arr[j] = arr[j+1];\n                    arr[j+1] = temp;\n                }\n            }\n        }\n        System.out.println(Arrays.toString(arr));\n    }<\/code><\/pre>\n<p><strong>\u6570\u7ec4\u6392\u5e8f<\/strong>\uff1aArrays.sort(\u6570\u7ec4\u540d);  \u9ed8\u8ba4\u662f\u6b63\u5e8f\u6392\u5e8f<\/p>\n<p><strong>\u6570\u7ec4\u8f6c\u5b57\u7b26\u4e32\uff1a<\/strong>Arrays.toString(\u6570\u7ec4\u540d)\uff1b<\/p>\n<p><strong>\u6570\u7ec4\u6269\u5bb9\uff1a<\/strong>Arrays.copyOf(\u6570\u7ec4\u540d, \u65b0\u957f\u5ea6)<\/p>\n<p>\u200b   \u6269\u5bb9\uff1a\u65b0\u957f\u5ea6\u6bd4\u539f\u957f\u5ea6\u5927<\/p>\n<p>\u200b   \u7f29\u5bb9\uff1a\u65b0\u957f\u5ea6\u6bd4\u539f\u957f\u5ea6\u5c0f<\/p>\n<p><strong>\u4e8c\u7ef4\u952f\u9f7f\u6570\u7ec4<\/strong><\/p>\n<p>\u6570\u636e\u7c7b\u578b[ ] [ ] \u6570\u7ec4\u540d = new \u6570\u636e\u7c7b\u578b[\u957f\u5ea6] [\u957f\u5ea6]<\/p>\n<p>int[] [] nums = new int[2] [3];<\/p>\n<p>nums[0] [0] nums[0] [1]   nums[0] [2]<\/p>\n<p>nums[1] [0]     nums[1] [1]   nums[1] [2]<\/p>\n<p>nums\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u91cc\u9762\u67092\u4e2a\u5143\u7d20\uff0c\u957f\u5ea6\u662f2<\/p>\n<p>nums[0]\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u91cc\u9762\u67093\u4e2a\u5143\u7d20\uff0c\u957f\u5ea6\u662f3<\/p>\n<p>nums[1]\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u91cc\u9762\u67093\u4e2a\u5143\u7d20\uff0c\u957f\u5ea6\u662f3<\/p>\n<pre><code class=\"language-java\">public static void main(String[] args) {\n        \/*\n         * \u4e8c\u7ef4\u952f\u9f7f\u6570\u7ec4\n         *\/\n        \/\/ int[][] nums = new int[2][3];\n        int[][] nums = new int[2][];\n        nums[0] = new int[3];\n        nums[1] = new int[2];\n        \/\/ \u7b2c\u4e00\u884c\n        nums[0][0] = 1;\n        nums[0][1] = 2;\n        nums[0][2] = 3;\n        \/\/ \u7b2c\u4e8c\u884c\n        nums[1][0] = 4;\n        nums[1][1] = 5;\n\/\/      System.out.println(nums.length);\/\/ 2\n\/\/      System.out.println(nums[0].length);\/\/ 3\n\/\/      System.out.println(nums[1].length);\/\/2\n\n        \/\/ \u904d\u5386\u4e8c\u7ef4\u952f\u9f7f\u6570\u7ec4\n        for (int i = 0; i &lt; nums.length; i++) {\n            for(int j=0;j&lt;nums[i].length;j++) {\n                System.out.print(nums[i][j]+&quot; &quot;);\n            }\n            System.out.println();\n        }\n\n    }<\/code><\/pre>\n<h2>\u9762\u5411\u5bf9\u8c61<\/h2>\n<p>\u9762\u5411\u8fc7\u7a0b\uff1a\u662f\u5177\u4f53\u5316\u7684\uff0c\u6d41\u7a0b\u5316\u7684\uff0c\u89e3\u51b3\u4e00\u4e2a\u95ee\u9898\uff0c\u4f60\u9700\u8981\u4e00\u6b65\u4e00\u6b65\u7684\u5206\u6790\uff0c\u4e00\u6b65\u4e00\u6b65\u7684\u5b9e\u73b0\uff0c\u6ce8\u91cd\u7684\u662f\u5177\u4f53\u5b9e\u73b0                  \u8fc7\u7a0b\uff0c\u6bcf\u4e2a\u6b65\u9aa4\u4eb2\u5386\u4eb2\u4e3a<\/p>\n<p>\u200b                   \u4f8b\uff1a\u5403\u997a\u5b50=\u300b\u548c\u9762\uff0c\u548c\u9985\uff0c\u5305\uff0c\u84b8\uff0c....\u81ea\u5df1\u5f04<\/p>\n<p>\u9762\u5411\u5bf9\u8c61\uff1a\u662f\u6a21\u578b\u5316\u7684\uff0c\u6ce8\u91cd\u7684\u662f\u5bf9\u8c61\u4e0e\u5bf9\u8c61\u4e4b\u95f4\u7684\u534f\u4f5c\uff0c\u4e0d\u5fc5\u53bb\u4e00\u6b65\u4e00\u6b65\u7684\u5b9e\u73b0<\/p>\n<p>\u200b                   \u4f8b\uff1a\u5403\u997a\u5b50=\u300b\u70b9\u5916\u9762\uff0c\u5546\u5bb6\u505a\uff0c\u9a91\u624b\u9001\uff0c\u81ea\u5df1\u5403<\/p>\n<p>\u200b   \u4f18\u70b9\uff1a\u6613\u7ef4\u62a4\uff0c\u6613\u590d\u7528\uff0c\u6613\u6269\u5c55\uff0c\u7531\u4e8e\u9762\u5411\u5bf9\u8c61\u6709\u5c01\u88c5\uff0c\u7ee7\u627f\uff0c\u591a\u6001\u7684\u7279\u6027\uff0c\u53ef\u4ee5\u8bbe\u8ba1\u51fa\u4f4e\u8026\u5408\u7684\u7cfb\u7edf\uff0c\u4f7f\u7cfb                \u7edf\u66f4\u52a0\u7075\u6d3b\uff0c\u66f4\u52a0\u6613\u4e8e\u7ef4\u62a4<\/p>\n<p>\u7c7b\uff1a\u662f\u4e00\u79cd\u62bd\u8c61\u7684\u8868\u793a\uff0c\u53ef\u4ee5\u628a\u5177\u6709\u76f8\u540c\u7279\u5f81\u7684\u4e8b\u7269\u5f52\u4e3a\u4e00\u7c7b\uff0c\u4f8b\uff1a\u4eba\u7c7b\uff0c\u8f66\u7c7b\uff0c\u9e1f\u7c7b<\/p>\n<p>\u5bf9\u8c61\uff1a\u7c7b\u522b\u4e2d\u5177\u4f53\u7684\u4e00\u4e2a\u4e8b\u7269<\/p>\n<p>\u5bf9\u8c61\u7684\u6210\u5458\uff1a<\/p>\n<p>\u200b   1.\u5c5e\u6027\uff1a\u6307\u5bf9\u8c61\u7684\u7279\u5f81<\/p>\n<p>\u200b   2.\u65b9\u6cd5\uff1a\u6307\u5bf9\u8c61\u7684\u52a8\u4f5c\uff08\u884c\u4e3a\uff09<\/p>\n<p><strong>\u5b9a\u4e49\u7c7b<\/strong><\/p>\n<p>\u8bbf\u95ee\u4fee\u9970\u7b26  class \u7c7b\u540d{<\/p>\n<p>}<\/p>\n<p><strong>\u5b9a\u4e49\u65b9\u6cd5<\/strong><\/p>\n<p>\u8bbf\u95ee\u4fee\u9970\u7b26  \u8fd4\u56de\u503c\u7c7b\u578b  \u65b9\u6cd5\u540d(\u53c2\u6570\u5217\u8868){<\/p>\n<p>\u200b   \u65b9\u6cd5\u4f53<\/p>\n<p>}<\/p>\n<p><strong>\u65b9\u6cd5\u53c2\u6570<\/strong>\uff1a\u65b9\u6cd5\u4e2d\u9700\u8981\u6570\u636e\uff0c\u4f46\u662f\u5b83\u672c\u8eab\u6ca1\u6709\uff0c\u9700\u8981\u4ece\u5916\u90e8\u4f20\u5165\u65f6\uff0c\u5c31\u8981\u5b9a\u4e49\u53c2\u6570<\/p>\n<p>\u5f62\u53c2\uff1a\u5f62\u5f0f\u53c2\u6570\uff0c\u5728\u65b9\u6cd5\u5b9a\u4e49\u65f6\u5199\u7684\u53c2\u6570<\/p>\n<p>\u5b9e\u53c2\uff1a\u5b9e\u9645\u53c2\u6570\uff0c\u5728\u65b9\u6cd5\u8c03\u7528\u65f6\u4f20\u5165\u7684\u53c2\u6570<\/p>\n<p><strong>\u8fd4\u56de\u503c<\/strong>\uff1a\u5916\u90e8\u9700\u8981\u65b9\u6cd5\u5185\u90e8\u6570\u636e<\/p>\n<p>\u200b   1.\u5728\u5b9a\u4e49\u65b9\u6cd5\u65f6\uff0c\u9700\u8981\u6307\u5b9a\u8fd4\u56de\u503c\u7c7b\u578b<\/p>\n<p>\u200b   2.\u5728\u65b9\u6cd5\u4f53\u4e2d\uff0c\u4f7f\u7528return\u5173\u952e\u5b57\uff0c\u8fd4\u56de\u4e00\u4e2a\u5177\u4f53\u7684\u503c<\/p>\n<p><strong>\u65b9\u6cd5\u91cd\u8f7d<\/strong>\uff1a\u65b9\u6cd5\u540d\u76f8\u540c\uff0c\u53c2\u6570\u5217\u8868\u4e0d\u540c\uff08\u53c2\u6570\u7684\u4e2a\u6570\u4e0d\u540c\uff0c\u53c2\u6570\u7c7b\u578b\u4e0d\u540c\uff09<\/p>\n<p><strong>\u65b9\u6cd5\u7b7e\u540d<\/strong>\uff1a\u65b9\u6cd5\u540d+\u53c2\u6570\u5217\u8868<\/p>\n<p><strong>\u53ef\u53d8\u957f\u53c2\u6570\/\u4e0d\u5b9a\u957f\u53c2\u6570\uff1a<\/strong>\u6570\u636e\u7c7b\u578b...\u53d8\u91cf\u540d\u3002\u53ef\u53d8\u957f\u53c2\u6570\u5fc5\u987b\u662f\u6700\u540e\u4e00\u4e2a\u53c2\u6570<\/p>\n<pre><code class=\"language-java\">package com.zretc.javase.d0302.p1;\n\npublic class Cal {\n\n    \/*\n     *  \u65b9\u6cd5\u91cd\u8f7d\uff1a\u65b9\u6cd5\u540d\u76f8\u540c\uff0c\u53c2\u6570\u5217\u8868\u4e0d\u540c(\u53c2\u6570\u4e2a\u6570\u4e0d\u540c\uff0c\u53c2\u6570\u7c7b\u578b\u4e0d\u540c)\n     *  \u65b9\u6cd5\u7b7e\u540d\uff1a\u65b9\u6cd5\u540d+\u53c2\u6570\u5217\u8868\n     *\/\n    public int add(int a, int b) {\n        return a + b;\n    }\n\n    public int add(int a, int b, int c) {\n        return a + b + c;\n    }\n\n    \/*\n     *  \u53ef\u53d8\u957f\u53c2\u6570\uff1a\u6570\u636e\u7c7b\u578b... \u53d8\u91cf\u540d\n     *  \u53ef\u53d8\u957f\u53c2\u6570\u5fc5\u987b\u662f\u6700\u540e\u4e00\u4e2a\u53c2\u6570\n     *\/\n    \/\/ \u6c42\u591a\u4e2a\u6574\u6570\u7684\u548c\n    public int add(int... nums) {\n        int sum = 0;\n        for (int num : nums) {\n            sum += num;\/\/ sum = sum+num\n        }\n        return sum;\n    }\n\n    public double add(double a, double b) {\n        return a + b;\n    }\n\n    public static void main(String[] args) {\n        Cal cal = new Cal();\n\/\/      double sum = cal.add(1.2, 1.3);\n\/\/      System.out.println(sum);\n\n        \/\/int[] nums = { 1, 2, 35, 8 };\n        System.out.println(cal.add(1,2,3,4));\n    }\n\n}\n<\/code><\/pre>\n<h2>\u6210\u5458\u53d8\u91cf(\u5b57\u6bb5\uff0c\u57df)<\/h2>\n<p>\u6210\u5458\u53d8\u91cf\u9ed8\u8ba4\u503c\uff1a<\/p>\n<p>\u6574\u6570\u7c7b\u578b\uff1a0<\/p>\n<p>\u200b   byte\uff1a(byte)0<\/p>\n<p>\u200b   short\uff1a(short)0<\/p>\n<p>\u200b   int:0<\/p>\n<p>\u200b   long:0L<\/p>\n<p>\u6d6e\u70b9\u7c7b\u578b\uff1a0.0<\/p>\n<p>\u200b   float\uff1a0.0F<\/p>\n<p>\u200b   double\uff1a0.0<\/p>\n<p>\u5b57\u7b26\u7c7b\u578b:\\u0000<\/p>\n<p>\u5e03\u5c14\u7c7b\u578b\uff1afalse<\/p>\n<p>\u7c7b\u7c7b\u578b\uff1anull<\/p>\n<p><strong>\u6210\u5458\u53d8\u91cf\u548c\u5c40\u90e8\u53d8\u91cf\u533a\u522b\uff1a<\/strong><\/p>\n<p>1.\u4f5c\u7528\u57df\u4e0d\u540c\uff1a<\/p>\n<p>\u200b   \u5c40\u90e8\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u4ec5\u5c40\u9650\u4e8e\u5b83\u7684\u65b9\u6cd5<\/p>\n<p>\u200b   \u6210\u5458\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u5728\u6574\u4e2a\u7c7b\u5185\u90e8\u90fd\u662f\u53ef\u89c1\u7684\uff0c\u8fd8\u53ef\u4ee5\u5728\u5916\u90e8\u8bbf\u95ee<\/p>\n<p>2.\u521d\u59cb\u503c\u4e0d\u540c<\/p>\n<p>\u200b   Java\u4f1a\u7ed9\u6210\u5458\u53d8\u91cf\u4e00\u4e2a\u521d\u59cb\u503c<\/p>\n<p>\u200b   Java\u4e0d\u4f1a\u7ed9\u5c40\u90e8\u53d8\u91cf\u4e00\u4e2a\u521d\u59cb\u503c<\/p>\n<p>3.\u5728\u540c\u4e00\u65b9\u6cd5\u4e2d\uff0c\u4e0d\u5141\u8bb8\u6709\u540c\u540d\u5c40\u90e8\u53d8\u91cf<\/p>\n<p>\u200b   \u5728\u4e0d\u540c\u65b9\u6cd5\u4e2d\uff0c\u53ef\u4ee5\u6709\u540c\u540d\u5c40\u90e8\u53d8\u91cf<\/p>\n<p>4.\u4e24\u7c7b\u53d8\u91cf\u540c\u540d\u65f6\uff0c\u5c40\u90e8\u53d8\u91cf\u5177\u6709\u66f4\u9ad8\u7684\u4f18\u5148\u7ea7<\/p>\n<h2>\u9762\u5411\u5bf9\u8c61\u4e09\u5927\u7279\u5f81<\/h2>\n<p>\u5c01\u88c5\uff0c\u7ee7\u627f\uff0c\u591a\u6001<\/p>\n<h2>\u5c01\u88c5<\/h2>\n<p>1.\u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5\u662f\u4e00\u79cd\u5c01\u88c5<\/p>\n<p>2.\u6210\u5458\u53d8\u91cf\u6216\u65b9\u6cd5\u7528private\u4fee\u9970\u662f\u4e00\u79cd\u5c01\u88c5<\/p>\n<p>\u5c5e\u6027\u7ec4\u6210\u90e8\u5206\uff1a\u5c5e\u6027\u53d8\u91cf\u548c\u5c5e\u6027\u8bbf\u95ee\u5668<\/p>\n<p>\u5c5e\u6027\u53d8\u91cf\uff1a\u7528\u4e8e\u8868\u793a\u5c5e\u6027\u7684\u6210\u5458\u53d8\u91cf<\/p>\n<p>\u5c5e\u6027\u8bbf\u95ee\u5668\uff1asetter\u548cgetter<\/p>\n<p>\u5c5e\u6027\u540d\uff1asetter\u548cgetter\u53bb\u6389set\u548cget\u540e\uff0c\u5269\u4e0b\u90e8\u5206\u9996\u5b57\u6bcd\u5c0f\u5199<\/p>\n<p>\u53ea\u8bfb\u5c5e\u6027\uff1a\u53ea\u6709getter\u6ca1\u6709setter<\/p>\n<pre><code class=\"language-java\">    private String name;\n    \/\/ \u8d4b\u503c\u65b9\u6cd5 setter set\u8bbf\u95ee\u5668\n    public void setName(String name) {\/\/name\n        \/\/ this:\u672c\u7c7b\u5bf9\u8c61\n        this.name = name;\n    }\n\n    \/\/ \u53d6\u503c\u65b9\u6cd5 getter get\u8bbf\u95ee\u5668\n    public String getName() {\n        return name;\n    }\n<\/code><\/pre>\n<h2>\u6784\u9020\u5668\uff08\u6784\u9020\u65b9\u6cd5\uff09<\/h2>\n<p>\u6ca1\u6709\u8fd4\u56de\u503c\u7c7b\u578b\uff0c\u540d\u79f0\u548c\u7c7b\u540d\u76f8\u540c<\/p>\n<p>\u9ed8\u8ba4\u6784\u9020\u65b9\u6cd5<\/p>\n<p>\u200b   1.\u5982\u679c\u4e0d\u521b\u5efa\u6784\u9020\u65b9\u6cd5\uff0c\u4e5f\u6709\u4e00\u4e2a\u9ed8\u8ba4\u7684\u6784\u9020\u65b9\u6cd5<\/p>\n<p>\u200b   2.\u9ed8\u8ba4\u6784\u9020\u65b9\u6cd5\u6ca1\u6709\u53c2\u6570<\/p>\n<p>\u200b   3.\u5982\u679c\u521b\u5efa\u4e86\u6709\u53c2\u6784\u9020\u65b9\u6cd5\uff0c\u5219\u9ed8\u8ba4\u6784\u9020\u65b9\u6cd5\u6d88\u5931<\/p>\n<p>\u5728\u6784\u9020\u5668\u4e2d\u8c03\u7528\u672c\u7c7b\u5176\u4ed6\u6784\u9020\u5668\uff1athis(\u53c2\u6570)<\/p>\n<p>this()\u5fc5\u987b\u5199\u5728\u6784\u9020\u5668\u7684\u7b2c\u4e00\u884c\u4ee3\u7801\u4e0a<\/p>\n<pre><code class=\"language-java\">package com.zretc.javase.d0303.p2;\n\npublic class Student {\n\n    private String name;\n    private int score;\n\n    public Student() {\n        System.out.println(&quot;\u8c03\u7528\u4e86\u6784\u9020\u65b9\u6cd5&quot;);\n    }\n\n    public Student(String name,int score) {\n        this();\n        this.name = name;\n        this.score = score;\n    }\n\n    public String getName() {\n        return name;\n    }\n\n    public int getScore() {\n        return score;\n    }\n\n}\n<\/code><\/pre>\n<pre><code class=\"language-java\">    public static void main(String[] args) {\n        \/\/ \u6784\u9020\u65b9\u6cd5\u662f\u5728\u5b9e\u4f8b\u5316\u5bf9\u8c61\u65f6\u81ea\u52a8\u8c03\u7528\n        Student st = new Student(&quot;\u9ad8\u65af\u6797&quot;, 90);\n        System.out.println(st.getName() + &quot;,&quot; + st.getScore());\n    }<\/code><\/pre>\n<h2>\u9759\u6001\u65b9\u6cd5\uff08\u7c7b\u65b9\u6cd5\uff09<\/h2>\n<p>\u662f\u5c5e\u4e8e\u7c7b\u7684\uff0c\u4e0d\u5c5e\u4e8e\u5bf9\u8c61\uff0c\u4f7f\u7528\u7c7b\u8c03\u7528<\/p>\n<p>\u9759\u6001\u65b9\u6cd5\u4e0d\u80fd\u8c03\u7528\u6210\u5458\u65b9\u6cd5\uff0c\u4e5f\u4e0d\u80fd\u4f7f\u7528\u6210\u5458\u53d8\u91cf<\/p>\n<p>\u9759\u6001\u65b9\u6cd5\u4e0d\u80fd\u4f7f\u7528this<\/p>\n<p>\u6210\u5458\u65b9\u6cd5\u53ef\u4ee5\u8c03\u7528\u9759\u6001\u65b9\u6cd5\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u9759\u6001\u53d8\u91cf<\/p>\n<p><strong>\u9759\u6001\u5757\uff0c\u9759\u6001\u4ee3\u7801\u5757<\/strong><\/p>\n<p>static{<\/p>\n<p>}<\/p>\n<p>\u5728\u7b2c\u4e00\u6b21\u4f7f\u7528\u7c7b\u65f6\u81ea\u52a8\u8c03\u7528\uff0c\u800c\u4e14\u53ea\u8c03\u7528\u4e00\u6b21<\/p>\n<p>\u9759\u6001\u5757\u7684\u6267\u884c\u8981\u4f18\u5148\u4e8e\u4e3b\u65b9\u6cd5\u7684\u6267\u884c<\/p>\n<p><strong>\u9759\u6001\u5757\u548c\u9759\u6001\u65b9\u6cd5\u7684\u533a\u522b\uff1a<\/strong><\/p>\n<p>1.\u9759\u6001\u5757\u81ea\u52a8\u8c03\u7528\uff0c\u9759\u6001\u65b9\u6cd5\u624b\u52a8\u8c03\u7528<\/p>\n<p>2.\u9759\u6001\u5757\u53ea\u80fd\u8c03\u7528\u4e00\u6b21\uff0c\u9759\u6001\u65b9\u6cd5\u53ef\u4ee5\u8c03\u7528\u591a\u6b21<\/p>\n<p>3.\u9759\u6001\u5757\u6ca1\u6709\u8bbf\u95ee\u4fee\u9970\u7b26\uff0c\u8fd4\u56de\u503c\u7c7b\u578b\uff0c\u540d\u79f0\uff0c\u53c2\u6570\uff0c\u9759\u6001\u65b9\u6cd5\u6709<\/p>\n<p><strong>\u52a8\u6001\u5757\uff1a<\/strong>{}\uff0c\u5b9e\u4f8b\u5316\u5bf9\u8c61\u65f6\u81ea\u52a8\u8c03\u7528<\/p>\n<h2>\u7ee7\u627f<\/h2>\n<p>\u51cf\u5c11\u4ee3\u7801\u5197\u4f59\uff0c\u5b9e\u73b0\u4ee3\u7801\u91cd\u7528\u6027<\/p>\n<p>\u8bbf\u95ee\u4fee\u9970\u7b26 class \u5b50\u7c7b extends \u7236\u7c7b{<\/p>\n<p>}<\/p>\n<p>\u5b50\u7c7b\u53c8\u53eb\u6d3e\u751f\u7c7b<\/p>\n<p>\u7236\u7c7b\u53c8\u53eb\u57fa\u7c7b\uff0c\u8d85\u7c7b<\/p>\n<p>\u5355\u7ee7\u627f\uff1a\u5b50\u7c7b\u53ea\u80fd\u7ee7\u627f\u4e00\u4e2a\u7236\u7c7b\uff0c\u5982Java<\/p>\n<p>\u591a\u7ee7\u627f\uff1a\u5b50\u7c7b\u53ef\u4ee5\u7ee7\u627f\u591a\u4e2a\u7236\u7c7b\uff0c\u5982C++<\/p>\n<p><strong>\u7ee7\u627f\u4e2d\u7684\u6784\u9020\u5668<\/strong><\/p>\n<p>1.\u5148\u8c03\u7528\u7236\u7c7b\u6784\u9020\u5668\uff0c\u518d\u8c03\u7528\u5b50\u7c7b\u6784\u9020\u5668<\/p>\n<p>2.\u5b50\u7c7b\u9ed8\u8ba4\u8c03\u7528\u7236\u7c7b\u7684\u65e0\u53c2\u6784\u9020\u5668<\/p>\n<p>3.\u6784\u9020\u5668\u4e0d\u80fd\u7ee7\u627f<\/p>\n<p>4.\u5b50\u7c7b\u8c03\u7528\u7236\u7c7b\u6784\u9020\u5668\uff1asuper(\u53c2\u6570)\uff0csuper()\u5fc5\u987b\u5199\u5728\u6784\u9020\u5668\u7684\u7b2c\u4e00\u884c\u4ee3\u7801\u4e0a<\/p>\n<p>5.\u5982\u679c\u7236\u7c7b\u6ca1\u6709\u65e0\u53c2\u6784\u9020\u5668\uff0c\u5219\u5b50\u7c7b\u5fc5\u987b\u624b\u52a8\u8c03\u7528\u7236\u7c7b\u7684\u5176\u4ed6\u6784\u9020\u5668<\/p>\n<p>super\uff1a\u7236\u7c7b\u7684<\/p>\n<p>super.\u5c5e\u6027\uff1a\u7236\u7c7b\u7684\u5c5e\u6027<\/p>\n<p>super.\u65b9\u6cd5(\u53c2\u6570)\uff1a\u7236\u7c7b\u7684\u65b9\u6cd5<\/p>\n<p>super(\u53c2\u6570)\uff1a\u7236\u7c7b\u7684\u6784\u9020\u5668\uff0c\u5fc5\u987b\u653e\u5728\u7b2c\u4e00\u884c<\/p>\n<p>this\uff1a\u672c\u7c7b\u5bf9\u8c61<\/p>\n<p>this.\u5c5e\u6027\uff1a\u5f53\u524d\u5bf9\u8c61\u5c5e\u6027<\/p>\n<p>this.\u65b9\u6cd5\uff1a\u5f53\u524d\u5bf9\u8c61\u7684\u65b9\u6cd5<\/p>\n<p>this(\u53c2\u6570)\uff1a\u5f53\u524d\u6784\u9020\u65b9\u6cd5\uff0c\u5fc5\u987b\u653e\u5728\u7b2c\u4e00\u884c<\/p>\n<h2>\u8bbf\u95ee\u4fee\u9970\u7b26<\/h2>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th>\u672c\u7c7b<\/th>\n<th>\u672c\u5305\u5176\u4ed6\u7c7b<\/th>\n<th>\u5176\u4ed6\u5305\u5b50\u7c7b<\/th>\n<th>\u5176\u4ed6\u5305<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>public (\u516c\u6709\u7684)<\/td>\n<td>\u221a<\/td>\n<td>\u221a<\/td>\n<td>\u221a<\/td>\n<td>\u221a<\/td>\n<\/tr>\n<tr>\n<td>protected (\u4fdd\u62a4\u7684)<\/td>\n<td>\u221a<\/td>\n<td>\u221a<\/td>\n<td>\u221a<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u9ed8\u8ba4\u7684<\/td>\n<td>\u221a<\/td>\n<td>\u221a<\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>private (\u79c1\u6709\u7684)<\/td>\n<td>\u221a<\/td>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u91cd\u5199<\/h2>\n<p>\u91cd\u5199\uff1a\u5b50\u7c7b\u91cd\u65b0\u5199\u7236\u7c7b\u7684\u65b9\u6cd5<\/p>\n<p><strong>\u4e00\u5927\u4e24\u5c0f\u4e24\u76f8\u540c<\/strong><\/p>\n<p>\u4e24\u76f8\u540c\uff1a\u65b9\u6cd5\u540d\u76f8\u540c\uff0c\u53c2\u6570\u5217\u8868\u76f8\u540c<\/p>\n<p>\u4e00\u5927\uff1a\u8bbf\u95ee\u4fee\u9970\u7b26\u8981\u5927\u4e8e\u7b49\u4e8e\u7236\u7c7b<\/p>\n<p>\u4e24\u5c0f\uff1a1)\u8fd4\u56de\u503c\u7c7b\u578b\u8981\u5c0f\u4e8e\u7b49\u4e8e\u7236\u7c7b\u7684<\/p>\n<p>\u5982\u679c\u662f\u57fa\u672c\u7c7b\u578b\u548cvoid\uff0c\u5fc5\u987b\u4fdd\u6301\u4e00\u81f4<\/p>\n<p>2)\u629b\u51fa\u5f02\u5e38\u7684\u7c7b\u578b\u8981\u5c0f\u4e8e\u7b49\u4e8e\u7236\u7c7b\u7684<\/p>\n<p><strong>\u4e0d\u80fd\u91cd\u5199\u7684\u65b9\u6cd5\uff1a<\/strong><\/p>\n<p>1.\u6784\u9020\u65b9\u6cd5\u4e0d\u80fd\u91cd\u5199<\/p>\n<p>2.\u79c1\u6709\u65b9\u6cd5\u4e0d\u80fd\u91cd\u5199<\/p>\n<p>3.\u9759\u6001\u65b9\u6cd5\u4e0d\u80fd\u91cd\u5199<\/p>\n<p>4.final\u4fee\u9970\u7684\u65b9\u6cd5\u4e0d\u80fd\u91cd\u5199<\/p>\n<p><strong>\u91cd\u8f7d\u4e0e\u91cd\u5199\u7684\u76f8\u540c\u70b9\u548c\u4e0d\u540c\u70b9<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>\u91cd\u5199\u4e0e\u91cd\u8f7d<\/th>\n<th>\u91cd\u5199\uff08override\uff09<\/th>\n<th>\u91cd\u8f7d\uff08overload\uff09<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u4f5c\u7528\u57df<\/td>\n<td>\u5b50\u91cd\u5199\u7236\u7684<\/td>\n<td>\u540c\u4e00\u4f5c\u7528\u57df\uff08\u5b50\u91cd\u8f7d\u7236\u7684\uff0c\u91cd\u8f7d\u81ea\u5df1\uff09<\/td>\n<\/tr>\n<tr>\n<td>\u65b9\u6cd5\u540d<\/td>\n<td>\u5fc5\u987b\u4e00\u81f4<\/td>\n<td>\u5fc5\u987b\u4e00\u81f4<\/td>\n<\/tr>\n<tr>\n<td>\u53c2\u6570\u5217\u8868<\/td>\n<td>\u5fc5\u987b\u4e00\u81f4<\/td>\n<td>\u5fc5\u987b\u4e0d\u4e00\u81f4<\/td>\n<\/tr>\n<tr>\n<td>\u8fd4\u56de\u503c\u7c7b\u578b<\/td>\n<td>\u8fd4\u56de\u503c\u7c7b\u578b\u8981\u5c0f\u4e8e\u7b49\u4e8e\u7236\u7c7b\u7684\uff0c\u5982\u679c\u662f\u57fa\u672c\u7c7b\u578b\u548cvoid\u5fc5\u987b\u4fdd\u6301\u4e00\u81f4<\/td>\n<td>\u65e0\u6240\u8c13<\/td>\n<\/tr>\n<tr>\n<td>\u8bbf\u95ee\u4fee\u9970\u7b26<\/td>\n<td>\u5b50\u5927\u4e8e\u7b49\u4e8e\u7236<\/td>\n<td>\u65e0\u6240\u8c13<\/td>\n<\/tr>\n<tr>\n<td>\u5f02\u5e38<\/td>\n<td>\u629b\u51fa\u5f02\u5e38\u7684\u7c7b\u578b\u8981\u5c0f\u4e8e\u7b49\u4e8e\u7236\u7c7b\u7684<\/td>\n<td>\u65e0\u6240\u8c13<\/td>\n<\/tr>\n<tr>\n<td>\u6b21\u6570<\/td>\n<td>\u4e00\u6b21<\/td>\n<td>\u591a\u6b21<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u591a\u6001<\/h2>\n<p>\u540c\u4e00\u79cd\u884c\u4e3a\uff0c\u4ea7\u751f\u7684\u7ed3\u679c\u4e0d\u540c<\/p>\n<p>\u6ee1\u8db3\u591a\u6001\u7684\u6761\u4ef6\uff1a\u7ee7\u627f  \u91cd\u5199  \u5411\u4e0a\u8f6c\u578b<\/p>\n<p>\u9762\u5411\u5bf9\u8c61\u4e09\u5927\u7279\u5f81\uff1a\u5c01\u88c5     \u7ee7\u627f  \u591a\u6001<\/p>\n<p>\u9762\u5411\u5bf9\u8c61\u56db\u5927\u7279\u5f81\uff1a\u5c01\u88c5     \u7ee7\u627f  \u591a\u6001  \u62bd\u8c61<\/p>\n<h2>final\u80fd\u4fee\u9970\u4ec0\u4e48<\/h2>\n<p>1.\u4fee\u9970\u7c7b\uff0c\u4e0d\u80fd\u88ab\u7ee7\u627f<\/p>\n<p>2.\u4fee\u9970\u65b9\u6cd5\uff0c\u4e0d\u80fd\u88ab\u91cd\u5199<\/p>\n<p>3.\u4fee\u9970\u53d8\u91cf\uff0c\u4e0d\u80fd\u88ab\u91cd\u590d\u8d4b\u503c<\/p>\n<p>\u200b   1\uff09\u6210\u5458\u53d8\u91cf\u7528final\u4fee\u9970\uff0c\u53ef\u4ee5\u5728\u5b9a\u4e49\u65f6\u8d4b\u503c\uff0c\u4e5f\u53ef\u4ee5\u5728\u6784\u9020\u5668\u548c\u52a8\u6001\u5757\u4e2d\u8d4b\u503c<\/p>\n<p>\u200b   2\uff09\u5e38\u91cf\uff1a\u4e00\u822c\u662f\u516c\u6709\u9759\u6001\u5e38\u91cf\uff0cpublic static final\u4fee\u9970<\/p>\n<p>\u200b                   \u547d\u540d\u89c4\u8303\uff1a\u6240\u6709\u5b57\u6bcd\u90fd\u5927\u5199\uff0c\u6bcf\u4e2a\u5355\u8bcd\u4e4b\u95f4\u7528\u4e0b\u5212\u7ebf\u5206\u9694\uff08\u5c16\u53eb\u86c7\u5e95\u5f0f\u547d\u540d\u6cd5\uff09<\/p>\n<p>\u200b   3\uff09\u5c40\u90e8\u53d8\u91cf\u7528final\u4fee\u9970\uff0c\u5728\u4f7f\u7528\u524d\u8d4b\u503c\u5373\u53ef\uff0c\u4f46\u53ea\u80fd\u8d4b\u503c\u4e00\u6b21<\/p>\n<p>4.\u53c2\u6570\u4e0a\u7528final\u4fee\u9970\uff0c\u4e0d\u53ef\u4ee5\u8d4b\u503c\uff0c\u503c\u662f\u901a\u8fc7\u65b9\u6cd5\u8c03\u7528\u4f20\u8fc7\u6765\u7684\uff0c\u5728\u65b9\u6cd5\u5185\u90e8\u4e0d\u80fd\u6539\u503c<\/p>\n<h2>JVM\u5185\u5b58<\/h2>\n<p>\u6808<\/p>\n<p>\u6808\u5e27\uff1aJVM\u4e3a\u6bcf\u4e00\u4e2a\u65b9\u6cd5\u90fd\u5b9a\u4e49\u4e86\u4e00\u4e2a\u6808\u5e27\uff0c\u6808\u5e27\u4e2d\u5b58\u653e\u5c40\u90e8\u53d8\u91cf<\/p>\n<p>\u5806\uff1a\u5b9e\u4f8b\u5316\u51fa\u6765\u7684\u5bf9\u8c61\uff0c\u6210\u5458\u53d8\u91cf<\/p>\n<p>\u65b9\u6cd5\u533a\uff1a\u9759\u6001\u53d8\u91cf\uff0c\u65b9\u6cd5\u4fe1\u606f<\/p>\n<h2>\u62bd\u8c61<\/h2>\n<p>\u62bd\u8c61\u7c7b\uff1a\u7c7b\u4e0a\u7528abstract\u4fee\u9970<\/p>\n<p>\u62bd\u8c61\u65b9\u6cd5\uff1a\u65b9\u6cd5\u4e0a\u7528abstract\u4fee\u9970\uff0c\u6ca1\u6709\u65b9\u6cd5\u4f53<\/p>\n<p>\u62bd\u8c61\u7c7b\u4e0d\u80fd\u5b9e\u4f8b\u5316\u5bf9\u8c61<\/p>\n<p>\u62bd\u8c61\u7c7b\u53ef\u4ee5\u6709\u62bd\u8c61\u65b9\u6cd5\uff0c\u4e5f\u53ef\u4ee5\u6709\u975e\u62bd\u8c61\u65b9\u6cd5<\/p>\n<p>\u5982\u679c\u5b50\u7c7b\u4e0d\u662f\u62bd\u8c61\u7c7b\uff0c\u5219\u5fc5\u987b\u5b9e\u73b0\u7236\u7c7b\u7684\u62bd\u8c61\u65b9\u6cd5<\/p>\n<p>\u5982\u679c\u5b50\u7c7b\u4e5f\u662f\u62bd\u8c61\u7c7b\uff0c\u5219\u53ef\u4ee5\u4e0d\u5b9e\u73b0\u7236\u7c7b\u7684\u62bd\u8c61\u65b9\u6cd5<\/p>\n<p>private \u548c abstract \u4e0d\u80fd\u8fde\u7528<\/p>\n<p>final\u548cabstract \u4e0d\u80fd\u8fde\u7528<\/p>\n<h2>\u63a5\u53e3<\/h2>\n<p>\u662f\u4e00\u79cd\u516c\u5171\u7684\u89c4\u8303\u6807\u51c6\uff0c\u5f15\u7528\u6570\u636e\u7c7b\u578b<\/p>\n<p><strong>\u5b9a\u4e49\u63a5\u53e3\uff1a<\/strong><\/p>\n<p>[\u8bbf\u95ee\u4fee\u9970\u7b26] interface \u63a5\u53e3\u540d{<\/p>\n<p>}<\/p>\n<p>1.\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u90fd\u662f\u516c\u6709\u62bd\u8c61\u65b9\u6cd5\uff08public abstract\uff09<\/p>\n<p>2.\u63a5\u53e3\u4e0d\u80fd\u5b9e\u4f8b\u5316<\/p>\n<p>3.\u63a5\u53e3\u4e2d\u6ca1\u6709\u6784\u9020\u5668<\/p>\n<p>4.\u63a5\u53e3\u4e2d\u7684\u53d8\u91cf\uff0c\u90fd\u662f\u516c\u6709\u9759\u6001\u5e38\u91cf\uff08public static final\u4fee\u9970\uff09<\/p>\n<p>5.\u5728Java8\u4e2d\uff0c\u63d0\u4f9b\u4e86\u63a5\u53e3\u7684\u9ed8\u8ba4\u65b9\u6cd5\uff08default\uff09\u548c\u9759\u6001\u65b9\u6cd5<\/p>\n<p>6.\u5728Java9\u4e2d\uff0c\u63d0\u4f9b\u4e86\u63a5\u53e3\u7684\u79c1\u6709\u65b9\u6cd5<\/p>\n<p>7.\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u5b9e\u73b0\u63a5\u53e3\u7684\u8bed\u6cd5\uff1a<\/p>\n<p>\u8bbf\u95ee\u4fee\u9970\u7b26 class \u7c7b\u540d implements \u63a5\u53e3\u540d1,\u63a5\u53e3\u540d2...{<\/p>\n<p>}<\/p>\n<p>8.\u7c7b\u662f\u5355\u7ee7\u627f\uff0c\u63a5\u53e3\u53ef\u4ee5\u591a\u5b9e\u73b0\uff0c\u591a\u7ee7\u627f<\/p>\n<p>9.\u5b9e\u73b0\u7c7b\u65e2\u53ef\u4ee5\u7ee7\u627f\u7236\u7c7b\uff0c\u53c8\u53ef\u4ee5\u5b9e\u73b0\u63a5\u53e3<\/p>\n<p>\u8bbf\u95ee\u4fee\u9970\u7b26 class \u7c7b\u540d extends \u7236\u7c7b implements \u63a5\u53e3\u540d1,\u63a5\u53e3\u540d2...{<\/p>\n<p>}<\/p>\n<p>10.\u63a5\u53e3\u7ee7\u627f\u63a5\u53e3<\/p>\n<p>\u8bbf\u95ee\u4fee\u9970\u7b26 interface \u63a5\u53e3\u540d extends \u63a5\u53e3\u540d1,\u63a5\u53e3\u540d2...{<\/p>\n<p>}<\/p>\n<p>11.\u62bd\u8c61\u7c7b\u4e0e\u63a5\u53e3<\/p>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th>\u62bd\u8c61\u7c7b<\/th>\n<th>\u63a5\u53e3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u5b9a\u4e49\u5173\u952e\u5b57<\/td>\n<td>abstract class<\/td>\n<td>interface<\/td>\n<\/tr>\n<tr>\n<td>\u7ee7\u627f\u5173\u7cfb<\/td>\n<td>\u5355\u7ee7\u627f<\/td>\n<td>\u591a\u7ee7\u627f<\/td>\n<\/tr>\n<tr>\n<td>\u6784\u9020\u65b9\u6cd5<\/td>\n<td>\u6709<\/td>\n<td>\u6ca1\u6709<\/td>\n<\/tr>\n<tr>\n<td>\u5b9e\u4f8b\u5316\u5bf9\u8c61<\/td>\n<td>\u4e0d\u80fd<\/td>\n<td>\u4e0d\u80fd<\/td>\n<\/tr>\n<tr>\n<td>\u666e\u901a\u6210\u5458<\/td>\n<td>\u53ef\u4ee5<\/td>\n<td>\u4e0d\u80fd\u6709\u53d8\u91cf\uff0c\u666e\u901a\u65b9\u6cd5\u662fjdk8\u4e4b\u540e\u53ef\u4ee5<\/td>\n<\/tr>\n<tr>\n<td>\u4e0e\u63a5\u53e3\u7684\u5173\u7cfb<\/td>\n<td>\u591a\u5b9e\u73b0\u3010implements\u3011<\/td>\n<td>\u591a\u7ee7\u627f\u3010extends\u3011<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>instanceof<\/h2>\n<p>\u5224\u65ad\u5de6\u8fb9\u7684\u5bf9\u8c61\u662f\u5426\u5c5e\u4e8e\u53f3\u8fb9\u7c7b\u7684\u5b9e\u4f8b\uff0c\u7ed3\u679c\u662fboolean\u7c7b\u578b\uff0c\u662f\u8fd4\u56detrue\uff0c\u4e0d\u662f\u8fd4\u56defalse<\/p>\n<pre><code class=\"language-java\">class Tree{} \nclass Pine extends Tree{} \nclass Oak extends Tree{} \npublic class Forest { \n    public static void main( String[] args ) { \n        Tree tree = new Pine(); \n        if( tree instanceof Pine ) \/\/ true\n            System.out.println( &quot;Pine&quot; ); \n        if( tree instanceof Tree ) \/\/ true\n            System.out.println( &quot;Tree&quot; ); \n        if( tree instanceof Oak ) \/\/ false\n            System.out.println( &quot;Oak&quot; ); \n        else \n            System.out.println( &quot;Oops&quot; ); \n    } \n}\n\u5219\u8f93\u51fa\u7ed3\u679c\u4e2d\u6709\u54ea\u4e9b\uff1f ABD\nA.Pine  B\uff0eTree  C\uff0eForest  D\uff0eOops E\uff0e\u65e0\u8f93\u51fa<\/code><\/pre>\n<h2>\u5185\u90e8\u7c7b<\/h2>\n<p>\u9759\u6001\u5185\u90e8\u7c7b   \u52a8\u6001\u5185\u90e8\u7c7b   \u5c40\u90e8\u5185\u90e8\u7c7b   \u533f\u540d\u5185\u90e8\u7c7b<\/p>\n<h3>\u9759\u6001\u5185\u90e8\u7c7b<\/h3>\n<p>\u8bbf\u95ee\u4fee\u9970\u7b26 class \u5916\u90e8\u7c7b{<\/p>\n<p>\u200b   \u8bbf\u95ee\u4fee\u9970\u7b26 static class \u5185\u90e8\u7c7b{<\/p>\n<p>\u200b   } <\/p>\n<p>}<\/p>\n<pre><code class=\"language-java\">public class Outer {\n\n    private static int n = 1;\n\n    public static class Inner {\n        private int n = 2;\n\n        public void show() {\n            int n = 3;\n            System.out.println(Outer.n + &quot;,&quot; + this.n + &quot;,&quot; + n);\n        }\n    }\n\n    public void display() {\n        Inner inner = new Inner();\n        inner.show();\n    }\n\n}<\/code><\/pre>\n<p>\u5728\u5916\u90e8\u8bbf\u95ee\u9759\u6001\u5185\u90e8\u7c7b\uff1a\u5916\u90e8\u7c7b.\u5185\u90e8\u7c7b \u53d8\u91cf = new \u5916\u90e8\u7c7b.\u5185\u90e8\u7c7b();<\/p>\n<pre><code class=\"language-java\">Outer.Inner inner = new Outer.Inner();\ninner.show();<\/code><\/pre>\n<h3>\u52a8\u6001\u5185\u90e8\u7c7b<\/h3>\n<p>\u8bbf\u95ee\u4fee\u9970\u7b26 class \u5916\u90e8\u7c7b{<\/p>\n<p>\u200b   \u8bbf\u95ee\u4fee\u9970\u7b26 class \u5185\u90e8\u7c7b{<\/p>\n<p>\u200b   } <\/p>\n<p>}<\/p>\n<p>\u5728\u5916\u90e8\u8bbf\u95ee\u52a8\u6001\u5185\u90e8\u7c7b\uff1a<\/p>\n<p>\u5916\u90e8\u7c7b \u53d8\u91cf = new \u5916\u90e8\u7c7b();<\/p>\n<p>\u5916\u90e8\u7c7b.\u5185\u90e8\u7c7b  \u53d8\u91cf = \u5916\u90e8\u7c7b\u53d8\u91cf.new \u5185\u90e8\u7c7b();<\/p>\n<pre><code class=\"language-java\">public class Outer {\n    private int n = 1;\n\n    public class Inner {\n        private int n = 2;\n\n        public void show() {\n            int n = 3;\n            System.out.println(Outer.this.n + &quot;,&quot; + this.n + &quot;,&quot; + n);\n        }\n    }\n\n    public void display() {\n        Inner inner = new Inner();\n        inner.show();\n    }\n\n}<\/code><\/pre>\n<pre><code class=\"language-java\">    public static void main(String[] args) {\n\/\/      Outer outer = new Outer();\n\/\/      outer.display();\n\n        Outer outer = new Outer();\n        Outer.Inner inner = outer.new Inner();\n        inner.show();\n    }<\/code><\/pre>\n<h3>\u5c40\u90e8\u5185\u90e8\u7c7b<\/h3>\n<pre><code class=\"language-java\">public class Test {\n\n    public static void main(String[] args) {\n        \/\/ \u5c40\u90e8\u5185\u90e8\u7c7b\n        class Inner{\n            public void show() {\n                System.out.println(&quot;a&quot;);\n            }\n        }\n\n        Inner inner = new Inner();\n        inner.show();\n    }\n\n}<\/code><\/pre>\n<h3>\u533f\u540d\u5185\u90e8\u7c7b<\/h3>\n<pre><code class=\"language-java\">public class Test {\n\n    public static void main(String[] args) {\n        \/*\n         *  \u533f\u540d\u5185\u90e8\u7c7b\n         *\/\n        Human h = new Human() {\n            @Override\n            public void work() {\n                System.out.println(&quot;\u5de5\u4f5c&quot;);\n            }\n        };\n\n        h.work();\n\n    }\n\n}<\/code><\/pre>\n<p><strong>\u7c7b\u80fd\u7528\u4ec0\u4e48\u8bbf\u95ee\u4fee\u9970\u7b26\u4fee\u9970<\/strong><\/p>\n<p>1.\u5bf9\u4e8e\u5916\u90e8\u7c7b\uff0c\u53ea\u80fd\u7528public\u548c\u9ed8\u8ba4\uff08\u4e0d\u5199\uff09<\/p>\n<p>2.\u5bf9\u4e8e\u5185\u90e8\u7c7b\uff1a<\/p>\n<p>\u200b   1\uff09\u5982\u679c\u662f\u9759\u6001\u5185\u90e8\u7c7b\u548c\u52a8\u6001\u5185\u90e8\u7c7b\uff0c\u56db\u79cd\u90fd\u53ef\u4ee5<\/p>\n<p>\u200b   2\uff09\u5982\u679c\u662f\u5c40\u90e8\u5185\u90e8\u7c7b\u548c\u533f\u540d\u5185\u90e8\u7c7b\uff0c\u4e0d\u53ef\u4ee5\u5199<\/p>\n<h2>String<\/h2>\n<p>\u5b57\u7b26\u4e32<\/p>\n<p>charAt(int index) \uff1a\u4f9d\u636e\u7d22\u5f15\u67e5\u627e\u5b57\u7b26<\/p>\n<p>compareTo()\uff1a\u5b57\u7b26\u4e32\u6bd4\u8f83\uff0c\u6b63\u6570\uff1a\u7b2c\u4e00\u4e2a\u4e32\u5927\uff0c\u8d1f\u6570\uff1a\u7b2c\u4e8c\u4e2a\u4e32\u5927\uff0c0\uff1a\u76f8\u7b49<\/p>\n<p>compareToIgnoreCase\uff1a\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u6bd4\u8f83<\/p>\n<p>contains\uff1a\u5224\u65ad\u662f\u5426\u5b58\u5728<\/p>\n<p>startsWith\uff1a\u5224\u65ad\u662f\u5426\u4ee5\u67d0\u5b50\u4e32\u5f00\u5934<\/p>\n<p>endsWith\uff1a\u5224\u65ad\u662f\u5426\u4ee5\u67d0\u5b50\u4e32\u7ed3\u5c3e<\/p>\n<p>equals\uff1a\u5224\u65ad\u5b57\u7b26\u4e32\u76f8\u7b49<\/p>\n<p>equalsIgnoreCase\uff1a\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u5224\u65ad\u5b57\u7b26\u4e32\u76f8\u7b49<\/p>\n<p>getBytes()\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6210byte\u6570\u7ec4<\/p>\n<p>indexOf()\uff1a\u4f9d\u636e\u5143\u7d20\u67e5\u627e\u7d22\u5f15\uff08\u4ece\u5de6\u5f80\u53f3\u67e5\u627e\u7b2c\u4e00\u4e2a\uff09<\/p>\n<p>lastIndexOf()\uff1a\u4f9d\u636e\u5143\u7d20\u67e5\u627e\u7d22\u5f15\uff08\u4ece\u5de6\u5f80\u53f3\u67e5\u627e\u6700\u540e\u4e00\u4e2a\uff09<\/p>\n<p>length()\uff1a\u5b57\u7b26\u4e32\u957f\u5ea6<\/p>\n<p>isEmpty()\uff1a\u5224\u65ad\u662f\u5426\u662f\u7a7a\u4e32<\/p>\n<p>replace(\u65e7\u4e32, \u65b0\u4e32)\uff1a\u5b57\u7b26\u4e32\u66ff\u6362<\/p>\n<p>split(\u5206\u9694\u7b26)\uff1a\u5b57\u7b26\u4e32\u5206\u9694\uff0c\u8fd4\u56de\u503c\u7c7b\u578b\u662f\u5b57\u7b26\u4e32\u6570\u7ec4\uff0c\u6ce8\u610f\uff1a\u5982\u679c\u9047\u5230\u5206\u9694\u7b26\u51fa\u73b0\u9519\u8bef\uff0c\u9700\u8981\u5c06\u5206\u9694\u7b26\u7528\\ \\\u8f6c\u4e49<\/p>\n<p>substring(\u5f00\u59cb\u4f4d\u7f6e\uff0c\u7ed3\u675f\u4f4d\u7f6e)\uff1a\u622a\u53d6\u5b50\u4e32\uff0c\u4e0d\u5305\u542b\u7ed3\u5c3e\u4f4d\u7f6e\uff0c\u542b\u5934\u4e0d\u542b\u5c3e\u3001<\/p>\n<p>substring(\u5f00\u59cb\u4f4d\u7f6e)\uff1a\u4ece\u5f00\u59cb\u4f4d\u7f6e\u622a\u53d6\u5230\u6700\u540e<\/p>\n<p>toCharArray()\uff1a\u5b57\u7b26\u4e32\u8f6cchar\u7c7b\u578b\u6570\u7ec4<\/p>\n<p>toLowerCase()\uff1a\u8f6c\u6210\u5c0f\u5199<\/p>\n<p>toUpperCase()\uff1a\u8f6c\u6210\u5927\u5199<\/p>\n<p>trim()\uff1a\u53bb\u6389\u5de6\u53f3\u4e24\u8fb9\u7a7a\u683c<\/p>\n<pre><code class=\"language-java\">package com.zretc.javase.d0309;\n\nimport java.util.Arrays;\n\npublic class StringDemo {\n\n    public static void main(String[] args) {\n        \/\/ 01234567\n        String str = &quot;abcdefga&quot;;\n        \/\/ \u4f9d\u636e\u7d22\u5f15\u67e5\u627e\u5b57\u7b26 \u7d22\u5f15\u4ece0\u5f00\u59cb\uff0c\u6700\u5927\u7d22\u5f15\u6bd4\u957f\u5ea6\u5c0f1\n        System.out.println(str.charAt(0));\n        String s1 = &quot;abc&quot;;\n        String s2 = &quot;ABC&quot;;\n        \/\/ \u5b57\u7b26\u4e32\u6bd4\u8f83\uff0c\u6b63\u6570\uff1a\u7b2c\u4e00\u4e2a\u4e32\u5927\uff0c\u8d1f\u6570\uff1a\u7b2c\u4e8c\u4e2a\u4e32\u5927\uff0c0\uff1a\u76f8\u7b49\n        System.out.println(s2.compareTo(s1));\n        \/\/ \u4e0d\u533a\u5206\u5927\u5c0f\u5199\u7684\u6bd4\u8f83\n        System.out.println(s1.compareToIgnoreCase(s2));\n        \/\/ \u5224\u65ad\u662f\u5426\u5b58\u5728\n        System.out.println(str.contains(&quot;df&quot;));\n        \/\/ \u5224\u65ad\u662f\u5426\u4ee5\u67d0\u5b50\u4e32\u5f00\u5934\n        System.out.println(str.startsWith(&quot;ab&quot;));\n        \/\/ \u5224\u65ad\u662f\u5426\u4ee5\u67d0\u5b50\u4e32\u7ed3\u5c3e\n        System.out.println(str.endsWith(&quot;ab&quot;));\n        \/\/ \u5224\u65ad\u5b57\u7b26\u4e32\u76f8\u7b49\n        System.out.println(s1.equals(s2));\n        \/\/ \u4e0d\u533a\u5206\u5927\u5c0f\u5199\u5224\u65ad\u5b57\u7b26\u4e32\u76f8\u7b49\n        System.out.println(s1.equalsIgnoreCase(s2));\n        \/\/ \u5c06\u5b57\u7b26\u4e32\u8f6c\u6210\u5b57\u8282\u6570\u7ec4\n        byte[] bs = str.getBytes();\n        \/\/ \u5c06\u6570\u7ec4\u8f6c\u5b57\u7b26\u4e32\u8f93\u51fa\n        System.out.println(Arrays.toString(bs));\n        \/\/ \u4f9d\u636e\u5143\u7d20\u67e5\u627e\u7d22\u5f15\uff08\u4ece\u5de6\u5f80\u53f3\uff09\n        System.out.println(str.indexOf(&quot;a&quot;));\n        \/\/ \u4f9d\u636e\u5143\u7d20\u67e5\u627e\u7d22\u5f15\uff08\u4ece\u5de6\u5f80\u53f3\u627e\u6700\u540e\u4e00\u4e2a\uff09\n        System.out.println(str.lastIndexOf(&quot;a&quot;));\n        \/\/ \u5224\u65ad\u662f\u5426\u662f\u7a7a\u4e32\n        System.out.println(str.isEmpty());\n        \/\/ \u5b57\u7b26\u4e32\u957f\u5ea6\uff1astr.length()\n        System.out.println(str.length() == 0);\n        \/\/ \u5b57\u7b26\u4e32\u66ff\u6362\n        System.out.println(str.replace(&quot;ab&quot;, &quot;q&quot;));\n        \/*\n         *  \u5b57\u7b26\u4e32\u5206\u5272\uff1a\u8fd4\u56de\u503c\u7c7b\u578b\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\u6570\u7ec4\n         *  \u5982\u679c\u9047\u5230\u5206\u9694\u7b26\u51fa\u73b0\u9519\u8bef\uff0c\u9700\u8981\u5c06\u5206\u9694\u7b26\u7528\\\\\u8f6c\u4e49\n         *\/\n        String strArr = &quot;tom.amy.john&quot;;\n        String[] arr = strArr.split(&quot;\\\\.&quot;);\n        System.out.println(Arrays.toString(arr));\n\n        \/*\n         *  \u622a\u53d6\u5b50\u4e32\uff1a\u5b57\u7b26\u4e32.substring(\u5f00\u59cb\u4f4d\u7f6e,\u7ed3\u675f\u4f4d\u7f6e)\uff1a\u4e0d\u5305\u542b\u7ed3\u5c3e\u4f4d\u7f6e\uff0c\u542b\u5934\u4e0d\u542b\u5c3e\u3001\n         *          \u5b57\u7b26\u4e32.substring(\u5f00\u59cb\u4f4d\u7f6e)\uff1a\u4ece\u5f00\u59cb\u4f4d\u7f6e\u622a\u53d6\u5230\u6700\u540e\n         *\/\n        String str2 = &quot;ABC&quot;;\n        System.out.println(str2.substring(1));\n        \/\/ \u5b57\u7b26\u4e32\u8f6cchar\u7c7b\u578b\u6570\u7ec4\n        char[] cs = str2.toCharArray();\n        System.out.println(Arrays.toString(cs));\n        \/\/ \u8f6c\u6210\u5927\u5199\n        System.out.println(str2.toUpperCase());\n        \/\/ \u8f6c\u6210\u5c0f\u5199\n        System.out.println(str2.toLowerCase());\n\n        String ss = &quot;    abc   &quot;;\n        \/\/ \u53bb\u6389\u5de6\u53f3\u4e24\u8fb9\u7a7a\u683c\n        System.out.println(ss.trim());\n\n    }\n\n}<\/code><\/pre>\n<p>\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\uff1a\u7a0b\u5e8f\u5f53\u4e2d\u76f4\u63a5\u5199\u4e0a\u7684\u53cc\u5f15\u53f7\u5b57\u7b26\u4e32\uff0c\u5c31\u5728\u4f60\u7684\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u91cc<\/p>\n<p>\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\uff1a==\u662f\u8fdb\u884c\u6570\u503c\u7684\u6bd4\u8f83<\/p>\n<p>\u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\uff1a==\u662f\u8fdb\u884c\u5730\u5740\u503c\u7684\u6bd4\u8f83<\/p>\n<p>\u5730\u5740\u76f8\u540c\u7684\u60c5\u51b5\uff1a<\/p>\n<p>\u60c5\u51b51\uff1a<\/p>\n<p>\u200b   String str1 = &quot;abc&quot;;<\/p>\n<p>\u200b   String str2 = &quot;abc&quot;;<br \/>\n\u60c5\u51b52\uff1a<\/p>\n<p>\u200b   String str1 = &quot;abc&quot;;<\/p>\n<p>\u200b   String str2 = &quot;ab&quot;+&quot;c&quot;;<\/p>\n<p>\u5730\u5740\u4e0d\u76f8\u540c\u7684\u60c5\u51b5\uff1a<\/p>\n<p>\u60c5\u51b51\uff1a<\/p>\n<p>\u200b   String str1 = &quot;abc&quot;;<\/p>\n<p>\u200b   String s = &quot;c&quot;;<\/p>\n<p>\u200b   String str2 = &quot;ab&quot; + s;<\/p>\n<p>\u60c5\u51b52\uff1a<\/p>\n<p>\u200b   String str1 = new String(&quot;abc&quot;);<\/p>\n<p>\u200b   String str2 = new String(&quot;abc&quot;);<\/p>\n<p>\u60c5\u51b53\uff1a<\/p>\n<p>\u200b   Scanner sc = new Scanner(System.in);<\/p>\n<p>\u200b   String str1 = &quot;abc&quot;;<\/p>\n<p>\u200b   String str2 = sc.next();<\/p>\n<p>StringBuilder,StringBuffer<\/p>\n<p>\u200b    \u4e13\u95e8\u7528\u6765\u5b57\u7b26\u4e32\u62fc\u63a5\u7684\uff0c\u62fc\u63a5\u65f6\u4e0d\u751f\u6210\u65b0\u7684\u5bf9\u8c61\uff0c\u62fc\u63a5\u901f\u5ea6\u5feb<\/p>\n<p><strong>String,StringBuilder,StringBuffer\u7684\u533a\u522b\uff1a<\/strong><\/p>\n<p>1.String\u662f\u5e38\u91cf\uff0c\u503c\u4e0d\u80fd\u6539\u53d8\uff0c\u62fc\u63a5\u5b57\u7b26\u4e32\u65f6\u751f\u6210\u65b0\u7684\u5bf9\u8c61\uff0c\u62fc\u63a5\u901f\u5ea6\u6162<\/p>\n<p>\u200b   StringBuilder\u548cStringBuffer\u662f\u52a8\u6001\u62fc\u63a5\uff0c\u62fc\u63a5\u65f6\u4e0d\u751f\u6210\u65b0\u7684\u5bf9\u8c61\uff0c\u62fc\u63a5\u901f\u5ea6\u5feb<\/p>\n<p>2.StringBuilder\u548cStringBuffer\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u65b9\u6cd5\uff0c\u5982\u63d2\u5165\u5220\u9664\u7b49<\/p>\n<p>3.StringBuilder\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\uff0c\u62fc\u63a5\u901f\u5ea6\u7a0d\u5feb<\/p>\n<p>\u200b   StringBuffer\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u62fc\u63a5\u901f\u5ea6\u7a0d\u6162<\/p>\n<pre><code class=\"language-java\">        StringBuilder s = new StringBuilder();\n        \/\/ \u6dfb\u52a0\u5b57\u7b26\u4e32\n        s.append(&quot;ab&quot;);\n        s.append(&quot;Hello&quot;);\n        System.out.println(s);\n        \/\/ \u63d2\u5165\u5b57\u7b26\u4e32\n        s.insert(1, &quot;q&quot;);\n        System.out.println(s);\n        \/\/ \u5220\u9664\u5b57\u7b26\u4e32 \u542b\u5934\u4e0d\u542b\u5c3e\n        s.delete(1, 4);\n        System.out.println(s);\n\n        StringBuilder ss = new StringBuilder(&quot;abcd&quot;);\n        \/\/ \u5b57\u7b26\u4e32\u53cd\u8f6c\n        System.out.println(ss.reverse());<\/code><\/pre>\n<h2>\u5305\u88c5\u7c7b\u578b<\/h2>\n<p>\u6bcf\u4e00\u4e2a\u57fa\u672c\u7c7b\u578b\uff0c\u90fd\u5bf9\u5e94\u7740\u4e00\u4e2a\u7c7b\uff0c\u5b83\u5c06\u57fa\u672c\u7c7b\u578b\u5c01\u88c5\u5230\u7c7b\u4e2d\uff0c\u6dfb\u52a0\u4e86\u989d\u4e3a\u5f97\u529f\u80fd\uff0c\u8fd8\u53ef\u4ee5\u8d4b\u503c\u4e3anull\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u57fa\u672c\u7c7b\u578b<\/th>\n<th>\u5305\u88c5\u7c7b\u578b<\/th>\n<th>\u7236\u7c7b\u578b<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>byte<\/td>\n<td>Byte<\/td>\n<td>Number<\/td>\n<\/tr>\n<tr>\n<td>short<\/td>\n<td>Short<\/td>\n<td>Number<\/td>\n<\/tr>\n<tr>\n<td>int<\/td>\n<td>Integer<\/td>\n<td>Number<\/td>\n<\/tr>\n<tr>\n<td>long<\/td>\n<td>Long<\/td>\n<td>Number<\/td>\n<\/tr>\n<tr>\n<td>float<\/td>\n<td>Float<\/td>\n<td>Number<\/td>\n<\/tr>\n<tr>\n<td>double<\/td>\n<td>Double<\/td>\n<td>Number<\/td>\n<\/tr>\n<tr>\n<td>char<\/td>\n<td>Character<\/td>\n<td>Object<\/td>\n<\/tr>\n<tr>\n<td>boolean<\/td>\n<td>Boolean<\/td>\n<td>Object<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u88c5\u7bb1\uff1a\u57fa\u672c\u7c7b\u578b\u8f6c\u6362\u6210\u5305\u88c5\u7c7b\u578b\u7684\u8fc7\u7a0b<\/p>\n<p>\u62c6\u7bb1\uff1a\u5305\u88c5\u7c7b\u578b\u8f6c\u6362\u6210\u57fa\u672c\u7c7b\u578b\u7684\u8fc7\u7a0b<\/p>\n<p>\u3010\u624b\u52a8\u62c6\u88c5\u7bb1\u3011<\/p>\n<p>Java 5 \u4e4b\u524d<\/p>\n<p>\u624b\u52a8\u88c5\u7bb1\uff1a\u5c06\u57fa\u672c\u6570\u636e\u5199\u5728\u5305\u88c5\u7c7b\u578b\u7684\u6784\u9020\u5668\u4e2d<\/p>\n<p>\u624b\u52a8\u62c6\u7bb1\uff1a\u5305\u88c5\u7c7b\u578b\u53d8\u91cf.xxxValue();<\/p>\n<p>\u3010\u81ea\u52a8\u62c6\u88c5\u7bb1\u3011<\/p>\n<p>\u81ea\u52a8\u88c5\u7bb1\uff1a\u5305\u88c5\u7c7b\u578b \u53d8\u91cf = \u57fa\u672c\u7c7b\u578b\u503c    Integer a = 12;<\/p>\n<p>\u81ea\u52a8\u62c6\u7bb1\uff1a\u57fa\u672c\u7c7b\u578b \u53d8\u91cf = \u5305\u88c5\u7c7b\u578b\u53d8\u91cf   int b = a;<\/p>\n<p>\u81ea\u52a8\u88c5\u7bb1\u7684\u6ce8\u610f\u4e8b\u9879\uff1a\u8d4b\u503c\u65f6\uff0c\u8981\u4e25\u683c\u5bf9\u5e94\u4e0a\u7c7b\u578b\u3002<\/p>\n<p>\u5982\uff1aLong num = 1L;<\/p>\n<p>\u200b       Double num2 = 10D;<\/p>\n<p>\u5305\u88c5\u7c7b\u578b\u6bd4\u8f83\u7528equals\u65b9\u6cd5<\/p>\n<p>\u3010\u6574\u578b\u6c60\u3011<\/p>\n<p>\u6574\u578b\u7f13\u5b58\u6c60\uff0c\u6574\u578b\u5e38\u91cf\u6c60<\/p>\n<p>\u8303\u56f4\uff1a-128~127<\/p>\n<p>Integer a = 128;<\/p>\n<p>Integer b = 128;<\/p>\n<p>System.out.println(a &gt;= b);\/\/ true<\/p>\n<p>\u9996\u5148\u5c06\u4e24\u4e2a\u5305\u88c5\u7c7b\u578b\u53d8\u91cf\u81ea\u52a8\u62c6\u7bb1\u6210\u57fa\u672c\u7c7b\u578b\uff0c\u7136\u540e\u6bd4\u8f83\u57fa\u672c\u7c7b\u578b\u7684\u503c<\/p>\n<p>\u7c7b\u578b\u8f6c\u6362\uff1a<\/p>\n<p>\u5305\u88c5\u7c7b\u578b.parse\u7c7b\u578b(\u5b57\u7b26\u4e32)\uff1a\u8fd4\u56de\u57fa\u672c\u7c7b\u578b<\/p>\n<p>\u5305\u88c5\u7c7b\u578b.valueOf(\u5b57\u7b26\u4e32)\uff1a\u8fd4\u56de\u5305\u88c5\u7c7b\u578b<\/p>\n<p>String str = &quot;12&quot;;<\/p>\n<p>int num = Integer.parseInt(str);<\/p>\n<p>Integer num2 = Integer.valueOf(str);<\/p>\n<p>MAX_VALUE\uff1a\u6700\u5927\u503c<\/p>\n<p>MIN_VALUE\uff1a\u6700\u5c0f\u503c<\/p>\n<p>SIZE\uff1a\u4f4d\u6570<\/p>\n<p><strong>Double<\/strong><\/p>\n<p>NaN:Not a Number <\/p>\n<p>NaN\u548c\u4efb\u4f55\u4e00\u4e2a\u6570\u90fd\u4e0d\u76f8\u7b49\uff0c\u5305\u62ec\u5b83\u81ea\u5df1<\/p>\n<p>Double.isNaN()\uff1a\u5224\u65ad\u662f\u5426\u662fNaN<\/p>\n<p>Double.NaN\uff1a0.0d \/ 0.0<\/p>\n<p>Infinity\uff1a\u6b63\u65e0\u7a77\u5927<\/p>\n<p>-Infinity\uff1a\u8d1f\u65e0\u7a77\u5927<\/p>\n<p>Double.POSITIVE_INFINITY\uff1a1.0\/0.0<\/p>\n<p>Double.NEGATIVE_INFINITY\uff1a-1.0\/0.0<\/p>\n<pre><code class=\"language-java\">        double num = 0.0 \/ 0.0;\n        System.out.println(num);\/\/ NaN:Not a Number\n        System.out.println(num == num);\/\/ false\uff0c NaN\u548c\u4efb\u4f55\u4e00\u4e2a\u6570\u90fd\u4e0d\u76f8\u7b49\uff0c\u5305\u62ec\u5b83\u81ea\u5df1\n        System.out.println(Double.isNaN(num));\/\/ \u5224\u65ad\u662f\u5426\u662fNaN\n\n        System.out.println(Double.NaN);\n\n        System.out.println(-1.0 \/ 0.0);\n\n        System.out.println(Double.POSITIVE_INFINITY);\n\n        System.out.println(Double.NEGATIVE_INFINITY);\n\n        double a = Double.NEGATIVE_INFINITY;\n        System.out.println((a + 1) == a);\/\/ true<\/code><\/pre>\n<p><strong>Character<\/strong><\/p>\n<pre><code class=\"language-java\">    public static void main(String[] args) {\n        char c = &#039; &#039;;\n        \/\/ \u5224\u65ad\u662f\u5426\u662f\u6574\u6570\n        System.out.println(c &gt;= &#039;0&#039; &amp;&amp; c &lt;= &#039;9&#039;);\n        System.out.println(Character.isDigit(c));\n        \/\/ \u5224\u65ad\u662f\u5426\u662f\u5c0f\u5199\u5b57\u6bcd\n        System.out.println(c &gt;= &#039;a&#039; &amp;&amp; c &lt;= &#039;z&#039;);\n        System.out.println(Character.isLowerCase(c));\n        \/\/ \u5224\u65ad\u662f\u5426\u662f\u5927\u5199\u5b57\u6bcd\n        System.out.println(c &gt;= &#039;A&#039; &amp;&amp; c &lt;= &#039;Z&#039;);\n        System.out.println(Character.isUpperCase(c));\n        \/\/ \u5224\u65ad\u662f\u5426\u662f\u5b57\u6bcd\n        System.out.println((c &gt;= &#039;a&#039; &amp;&amp; c &lt;= &#039;z&#039;) || (c &gt;= &#039;A&#039; &amp;&amp; c &lt;= &#039;Z&#039;));\n        System.out.println(Character.isLetter(c));\n        \/\/ \u5224\u65ad\u662f\u5426\u662f\u5b57\u6bcd\u6216\u8005\u6570\u5b57\n        System.out.println((c &gt;= &#039;a&#039; &amp;&amp; c &lt;= &#039;z&#039;) || (c &gt;= &#039;A&#039; &amp;&amp; c &lt;= &#039;Z&#039;) || (c &gt;= &#039;0&#039; &amp;&amp; c &lt;= &#039;9&#039;));\n        System.out.println(Character.isLetterOrDigit(c));\n        \/\/ \u5224\u65ad\u662f\u5426\u662f\u7a7a\u767d\u5b57\u7b26\n        System.out.println(Character.isWhitespace(c));\n\n    }<\/code><\/pre>\n<h2>\u6b63\u5219\u8868\u8fbe\u5f0f<\/h2>\n<p>Java\u662f\u4eceJava 1.4\u5f00\u59cb\u652f\u6301\u7684\u6b63\u5219\u8868\u8fbe\u5f0f<\/p>\n<p>\u6b63\u5219\u8868\u8fbe\u5f0f\uff0c\u7b80\u5199\u4e3aregex\uff0cregxp\uff0cregexp<\/p>\n<p>\u662f\u7528\u4e8e\u5339\u914d\u3001\u67e5\u627e\u3001\u66ff\u6362\u6587\u672c\u7b49\u64cd\u4f5c\u7684\u8868\u8fbe\u5f0f<\/p>\n<p>\u6b63\u5219\u8868\u8fbe\u5f0f\u4e2d\u5305\u542b\u666e\u901a\u5b57\u7b26\u548c\u5143\u5b57\u7b26<\/p>\n<p>\u5143\u5b57\u7b26\u5c31\u662f\u4e00\u7c7b\u7279\u6b8a\u7684\u5b57\u7b26\uff0c\u6709\u5177\u4f53\u7684\u542b\u4e49<\/p>\n<p>^\u3001$\uff1a\u5f00\u59cb\u548c\u7ed3\u675f<\/p>\n<p>[abc] \uff1a\u5339\u914dabc\u4e2d\u4efb\u610f\u5b57\u7b26<\/p>\n<p>[^abc] \uff1a\u9664\u4e86abc\u7684\u4efb\u610f\u5b57\u7b26<\/p>\n<p>[a-z] \uff1aa\u5230z\u4e4b\u95f4\u7684\u5b57\u7b26<\/p>\n<p>[a-zA-Z0-9] \uff1aa\u5230z\uff0cA\u5230Z\uff0c0\u52309\u4e4b\u95f4\u7684\u4efb\u610f\u5b57\u7b26<\/p>\n<p>\\d \uff1a\u6570\u5b57\u5b57\u7b26\uff0c\u7b49\u6548\u4e8e[0-9]<\/p>\n<p>\\w \uff1a\u5355\u8bcd\u5b57\u7b26\uff0c\u7b49\u6548\u4e8e[a-zA-Z0-9_]<\/p>\n<p>\\s \uff1a\u7a7a\u767d\u5b57\u7b26\uff0c\u5982\u7a7a\u683c\uff0c\u5236\u8868\u7b26\uff0c\u6362\u884c\uff0c\u56de\u8f66<\/p>\n<p>\\D \uff1a\u975e\u6570\u5b57\u5b57\u7b26<\/p>\n<p>\\W \uff1a\u975e\u5355\u8bcd\u5b57\u7b26<\/p>\n<p>\\S \uff1a\u975e\u7a7a\u767d\u5b57\u7b26<\/p>\n<p>? \uff1a0\u52301\u4e2a<\/p>\n<p>*\uff1a0\u5230\u591a\u4e2a<\/p>\n<p>+\uff1a1\u5230\u591a\u4e2a<\/p>\n<p><strong>.<\/strong> \uff1a\u4efb\u610f\u5b57\u7b26<\/p>\n<p>| \uff1a\u6216\u8005<\/p>\n<p>\\ \uff1a\u8f6c\u4e49<\/p>\n<p>X{n}\uff1an\u4e2aX<\/p>\n<p>X{n,}\uff1an\u5230\u591a\u4e2aX<\/p>\n<p>X{n,m}\uff1an\u5230m\u4e2aX<\/p>\n<p>^\uff1a\u975e<\/p>\n<p>()\uff1a\u5206\u7ec4<\/p>\n<pre><code class=\"language-java\">    public static void main(String[] args) {\n        String str = &quot;\u4e2d\u56fd&quot;;\n        \/\/ \u9a8c\u8bc1\u662f\u5426\u662f\u6574\u6570\n        boolean ok = str.matches(&quot;^\\\\d+$&quot;);\n        System.out.println(ok);\n\n        \/\/ \u9a8c\u8bc1\u662f\u5426\u662f\u5c0f\u6570\n        boolean ok2 = str.matches(&quot;^\\\\d+\\\\.\\\\d+$&quot;);\n        System.out.println(ok2);\n\n        \/\/ \u9a8c\u8bc1\u4e24\u4f4d\u5c0f\u6570\n        boolean ok3 = str.matches(&quot;^\\\\d+\\\\.\\\\d{2}$&quot;);\n        System.out.println(ok3);\n\n        \/\/ \u9a8c\u8bc1\u6574\u6570\u6216\u8005\u5c0f\u6570\n        boolean ok4 = str.matches(&quot;^\\\\d+(\\\\.\\\\d+)?$&quot;);\n        System.out.println(ok4);\n\n        \/\/ \u9a8c\u8bc1\u5927\u591a\u6570\u6c49\u5b57  :\\u4E00 \\u9FA5\n        boolean ok5 = str.matches(&quot;^[\\u4E00-\\u9FA5]+$&quot;);\n        System.out.println(ok5);\n\n    }<\/code><\/pre>\n<pre><code class=\"language-java\">    public static void main(String[] args) {\n        String str = &quot;abc123dea456wers&quot;;\n        \/\/ str = str.replace(&quot;123&quot;, &quot;-&quot;);\n        str = str.replaceAll(&quot;\\\\d+&quot;, &quot;-&quot;);\n        System.out.println(str);\n\n        String str2 = &quot;Java.Python.PHP&quot;;\n        String[] ss = str2.split(&quot;\\\\.&quot;);\n        System.out.println(Arrays.toString(ss));\n    }<\/code><\/pre>\n<pre><code class=\"language-java\">    public static void main(String[] args) {\n\/\/      String str = &quot;Java123Python456&quot;;\n\/\/      \/\/ \u6a21\u5f0f\u5bf9\u8c61\uff0c\u8bbe\u7f6e\u6b63\u5219\u8868\u8fbe\u5f0f\n\/\/      Pattern p = Pattern.compile(&quot;[a-zA-Z]+&quot;);\n\/\/      \/\/ \u5339\u914d\u5bf9\u8c61\uff0c\u5339\u914d\u5b57\u7b26\u4e32\n\/\/      Matcher m = p.matcher(str);\n\/\/      \/\/ \u5224\u65ad\u6709\u6ca1\u6709\u627e\u5230\u5339\u914d\u4e0a\u7684\u5b57\u7b26\u4e32\n\/\/      while (m.find()) {\n\/\/          System.out.println(m.group());\/\/ \u5339\u914d\u4e0a\u7684\u5b57\u7b26\u4e32\n\/\/      }\n\n        \/\/ \u952e\u503c\u5bf9\n        String str = &quot;n@ame=to@%m;salary=18000;&quot;;\n        Pattern p = Pattern.compile(&quot;([^=]+)=([^;]+);&quot;);\n        Matcher m = p.matcher(str);\n        while (m.find()) {\n            \/\/ m.group(\u7ec4\u7d22\u5f15)\uff1a\u4ece1\u5f00\u59cb\n            System.out.println(m.group(1) + &quot;\\t&quot; + m.group(2));\n        }\n    }<\/code><\/pre>\n<h2>Object<\/h2>\n<p>Object\u662f\u6240\u6709\u7c7b\u7684\u7236\u7c7b\uff0c\u53c8\u53eb\u9876\u7ea7\u7236\u7c7b\uff0c\u4e5f\u53eb\u4e07\u7c7b\u4e4b\u6e90<\/p>\n<p>\u5982\u679c\u4e00\u4e2a\u7c7b\u6ca1\u6709\u6307\u5b9a\u7236\u7c7b\uff0c\u4e5f\u9ed8\u8ba4\u7ee7\u627f\u4e86Object<\/p>\n<p>\u9664\u4e86Object\u4e4b\u5916\uff0c\u5269\u4e0b\u7684\u6240\u6709\u7c7b\u90fd\u6709\u7236\u7c7b<\/p>\n<p>Object\u4e2d\u6709\u4e00\u4e9b\u65b9\u6cd5\uff0c\u6709\u7684\u65f6\u5019\u6211\u4eec\u9700\u8981\u91cd\u5199\uff1a<\/p>\n<p>\u5982\uff1atoString()\uff1a\u9ed8\u8ba4\u662f\u8fd4\u56de\u7c7b\u5168\u540d@\u54c8\u5e0c\u503c<\/p>\n<p>\u200b   \u4e00\u822c\u7528\u4f5c\u8fd4\u56de\u7c7b\u4e2d\u4fe1\u606f\uff08\u6210\u5458\u53d8\u91cf\u7684\u503c\uff09\uff0c\u6240\u4ee5\u9700\u8981\u91cd\u5199<\/p>\n<p>\u5bf9\u4e8eprint\u548cprintln\uff0c\u5982\u679c\u4f20\u5165\u7c7b\u7c7b\u578b\u53d8\u91cf\uff0c\u5c31\u662f\u8c03\u7528toString\u65b9\u6cd5<\/p>\n<p>equals()\uff0cequals\u65b9\u6cd5\u662fObject\u4e2d\u7684\u65b9\u6cd5\uff0c\u9ed8\u8ba4\u662f\u5224\u65ad\u5730\u5740\u76f8\u7b49(==)<\/p>\n<p>\u4f46\u662f\u5b98\u65b9\u5efa\u8bae\u4f60\u91cd\u5199equals()\uff0c\u7528\u4e8e\u6bd4\u8f83\u503c\u76f8\u7b49<\/p>\n<p>\uff08\u6bd4\u5982String\uff0c\u5728String\u7c7b\u4e2d\u5b9a\u4e49\u7684equals\u80fd\u591f\u6bd4\u8f83\u503c\u76f8\u7b49\uff0c\u662f\u56e0\u4e3aString\u4e2d\u91cd\u5199\u4e86equals\uff09<\/p>\n<pre><code class=\"language-java\">public class Emp {\n\n    private String name;\n    private double salary;\n\n    public String getName() {\n        return name;\n    }\n\n    public void setName(String name) {\n        this.name = name;\n    }\n\n    public double getSalary() {\n        return salary;\n    }\n\n    public void setSalary(double salary) {\n        this.salary = salary;\n    }\n    \/\/ \u4e00\u822c\u7528\u4f5c\u8fd4\u56de\u7c7b\u4e2d\u4fe1\u606f\uff08\u6210\u5458\u53d8\u91cf\u7684\u503c\uff09\uff0c\u6240\u4ee5\u9700\u8981\u91cd\u5199\n\n    @Override\n    public String toString() {\n        return &quot;Emp [name=&quot; + name + &quot;, salary=&quot; + salary + &quot;]&quot;;\n    }\n\n}<\/code><\/pre>\n<pre><code class=\"language-java\">    public static void main(String[] args) {\n        Emp emp = new Emp();\n        emp.setName(&quot;tom&quot;);\n        emp.setSalary(18000);\n        \/\/ \u5bf9\u4e8eprint\u548cprintln\uff0c\u5982\u679c\u4f20\u5165\u7684\u7c7b\u7c7b\u578b\u53d8\u91cf\uff0c\u5c31\u662f\u8c03\u7528\u4e86toString\u65b9\u6cd5\n        System.out.println(emp);\n\n        Emp emp2 = new Emp();\n        emp2.setName(&quot;tom&quot;);\n        emp2.setSalary(18000);\n        System.out.println(emp.equals(emp2));\/\/ false\n\n    }<\/code><\/pre>\n<h2>Math<\/h2>\n<p>Math.max()\uff1a\u6700\u5927\u503c<\/p>\n<p>Math.min()\uff1a\u6700\u5c0f\u503c<\/p>\n<p>Math.round()\uff1a\u56db\u820d\u4e94\u5165<\/p>\n<p>Math.ceil()\uff1a\u5411\u4e0a\u53d6\u6574<\/p>\n<p>Math.floor()\uff1a\u5411\u4e0b\u53d6\u6574<\/p>\n<p>Math.pow()\uff1a\u6c42\u5e42<\/p>\n<p>Math.sqrt()\uff1a\u5f00\u5e73\u65b9<\/p>\n<p>Math.cbrt()\uff1a\u5f00\u7acb\u65b9<\/p>\n<p>Math.abs()\uff1a\u7edd\u5bf9\u503c<\/p>\n<p>Math.PI\uff1a\u03a0<\/p>\n<h2>Random<\/h2>\n<p>\u968f\u673a\u6570<\/p>\n<p>\u200b   1.Math.random()  \u751f\u62100~1\u4e4b\u95f4\u7684\u968f\u673a\u5c0f\u6570<\/p>\n<p>\u200b       \u751f\u6210\u968f\u673a\u6570[min,max) =\u300b int(Math.random()*(max-min))+min<\/p>\n<p>\u200b   2.Random\u7c7b<\/p>\n<p>\u200b       Random rand = new Random();<\/p>\n<p>\u200b       rand.nextInt(\u4e0a\u9650)\uff1a[0,\u4e0a\u9650)  \u968f\u673a\u6574\u6570<\/p>\n<p>\u200b       \u751f\u6210\u968f\u673a\u6570[min,max) =\u300brand.nextInt(max-min)+min;<\/p>\n<h2>Date<\/h2>\n<p><strong>date\uff1a\u65e5\u671f\u7c7b<\/strong><\/p>\n<p>Date date = new Date();\u8c03\u7528\u4e86System.currentTimeMillis() \u7cfb\u7edf\u6beb\u79d2\u6570<\/p>\n<p>getTime()\uff1a\u83b7\u53d6\u7cfb\u7edf\u6beb\u79d2\u6570<\/p>\n<p>setTime()\uff1a\u8bbe\u7f6e\u7cfb\u7edf\u6beb\u79d2\u6570<\/p>\n<p>compareTo\uff1a\u65e5\u671f\u6bd4\u8f83\uff0c\u8fd4\u56de\u503c\uff1a\u6b63\u6570\u7b2c\u4e00\u4e2a\u65e5\u671f\u5927\uff0c\u8d1f\u6570\u7b2c\u4e8c\u4e2a\u65e5\u671f\u5927\uff0c0\u76f8\u540c<\/p>\n<p>after\uff1a\u5224\u65ad\u65e5\u671f\u662f\u5426\u662f\u53e6\u4e00\u4e2a\u65e5\u671f\u4e4b\u540e<\/p>\n<p>before\uff1a\u5224\u65ad\u65e5\u671f\u662f\u5426\u662f\u53e6\u4e00\u4e2a\u65e5\u671f\u4e4b\u524d<\/p>\n<p><strong>SimpleDateFormat\uff0c\u7b80\u5355\u65e5\u671f\u683c\u5f0f\uff0c\u7528\u6765\u505a\u65e5\u671f\u7684\u683c\u5f0f\u5316<\/strong><\/p>\n<p><strong>\u683c\u5f0f\u5316\u5b57\u7b26<\/strong><\/p>\n<p>\uff59\uff1a\u5e74(yyyy\uff0c\u56db\u4f4d\u53ca\u4ee5\u4e0a\uff1byy\uff1a\u4e24\u4f4d\u5e74)<\/p>\n<p>M\uff1a\u6708\uff08MM\uff1a\u4e24\u4f4d\u6708\uff09<\/p>\n<p>d\uff1a\u65e5\uff08dd\uff0c\u4e24\u4f4d\u65e5\u671f\uff09<\/p>\n<p>h\uff1a12\u8fdb\u5236\u5c0f\u65f6\uff08hh\uff0c\u4e24\u4f4d\u5c0f\u65f6\uff09<\/p>\n<p>H\uff1a24\u8fdb\u5236\u5c0f\u65f6\uff08HH\uff0c\u4e24\u4f4d\u5c0f\u65f6\uff09<\/p>\n<p>m\uff1a\u5206\u949f<\/p>\n<p>s\uff1a\u79d2<\/p>\n<p>S\uff1a\u6beb\u79d2<\/p>\n<p>E\uff1a\u661f\u671f<\/p>\n<p>a\uff1a\u4e0a\u5348\/\u4e0b\u5348<\/p>\n<p>\u5982\u679c\u60f3\u76f4\u63a5\u663e\u793a\u5b57\u6bcd\uff0c\u9700\u8981\u52a0\u4e0a\u5355\u5f15\u53f7<\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) throws ParseException {\n        Date date = new Date();\n        \/\/ \u5982\u679c\u60f3\u76f4\u63a5\u663e\u793a\u5b57\u6bcd\uff0c\u9700\u8981\u52a0\u4e0a\u5355\u5f15\u53f7\n        SimpleDateFormat fmt = new SimpleDateFormat(&quot;yyyy\u5e74MM\u6708dd\u65e5 &#039;at&#039; HH:mm:ss&quot;);\n        \/\/ Date\u5bf9\u8c61\u8f6c\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\n        String str = fmt.format(date);\n        System.out.println(str);\n        \/\/ \u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u8f6cDate\u5bf9\u8c61 \u5b57\u7b26\u4e32\u4e0e\u65e5\u671f\u6a21\u677f\u4e0d\u4e00\u81f4\u65f6\uff0c\u65e5\u671f\u8f6c\u6362\u5f02\u5e38\uff1aParseException\n        \/\/ Date date2 = fmt.parse(str);\n        Date date2 = fmt.parse(str,new ParsePosition(0))\n        System.out.println(date2);\n    }<\/code><\/pre>\n<p><strong>Calendar<\/strong><\/p>\n<p>\u83b7\u53d6\u5e74\u4efd\uff1acal.get(Calendar.YEAR)<\/p>\n<p>\u83b7\u53d6\u6708\u4efd\uff1acal.get(Calendar.MONTH)+1\uff0c\u6708\u4efd\u4ece0\u5f00\u59cb\uff0c\u6240\u4ee5\u771f\u5b9e\u6708\u4efd\u9700\u8981\u52a01<\/p>\n<p>\u83b7\u53d6\u65e5\u671f\uff1acal.get(Calendar.DATE) \u6216\u8005 cal.get(Calendar.DAY_OF_MONTH)<\/p>\n<p>\u83b7\u53d6\u5c0f\u65f6\uff0812\u8fdb\u5236\uff09\uff1acal.get(Calendar.HOUR)<\/p>\n<p>\u83b7\u53d6\u5c0f\u65f6\uff0824\u8fdb\u5236\uff09\uff1acal.get(Calendar.HOUR_OF_DAY)<\/p>\n<p>\u83b7\u53d6\u5206\u949f\uff1acal.get(Calendar.MINUTE)<\/p>\n<p>\u83b7\u53d6\u79d2\uff1acal.get(Calendar.SECOND)<\/p>\n<p>\u83b7\u53d6\u661f\u671f\uff0c\u661f\u671f\u4ece1\u5f00\u59cb\uff0c\u661f\u671f\u65e5\u662f1\uff1acal.get(Calendar.DAY_OF_WEEK)-1<\/p>\n<p>\u6dfb\u52a0\u5b57\u6bb5\u7684\u503c\uff1acal.add(\u5b57\u6bb5\u7684\u5e38\u91cf\uff0c\u503c)<\/p>\n<p>\u6eda\u52a8\u5b57\u6bb5\u7684\u503c\uff1acal.roll(\u5b57\u6bb5\u7684\u5e38\u91cf, \u503c)<\/p>\n<p>add \u548c roll\u7684\u533a\u522b\uff1a<\/p>\n<p>add\uff1a\u5982\u679c\u8d85\u51fa\u6587\u672c\u5b57\u6bb5\u7684\u8303\u56f4\uff0c\u4f1a\u5f71\u54cd\u5230\u4e0a\u4e00\u4e2a\u5b57\u6bb5<\/p>\n<p>roll\uff1a\u5982\u679c\u8d85\u51fa\u6587\u672c\u5b57\u6bb5\u7684\u8303\u56f4\uff0c\u4e0d\u4f1a\u5f71\u54cd\u4e0a\u4e00\u4e2a\u5b57\u6bb5\uff0c\u4f1a\u5728\u672c\u5b57\u6bb5\u4e2d\u5faa\u73af\u6eda\u52a8<\/p>\n<p>\u5f53\u524d\u65e5\u671f\u662f\u5f53\u524d\u5e74\u4efd\u7684\u7b2c\u51e0\u5929\uff1acal.get(Calendar.DAY_OF_YEAR)<\/p>\n<pre><code class=\"language-java\">    public static void main(String[] args) {\n        Calendar cal = Calendar.getInstance();\n        \/\/ \u8bbe\u7f6e\u5b57\u6bb5\uff1acal.set\uff08\u5b57\u6bb5\u5e38\u91cf\uff0c\u503c\uff09\n        cal.set(Calendar.YEAR, 2023);\n        cal.set(Calendar.MONTH, 2 - 1);\n        cal.set(Calendar.MONDAY, Calendar.OCTOBER);\n        \/\/ \u8bbe\u7f6e\u5e74\u6708\u65e5\n        cal.set(2022, 2 - 1, 28);\n\n        \/\/ \u83b7\u53d6Date\u5bf9\u8c61\n        Date date = cal.getTime();\n        SimpleDateFormat fmt = new SimpleDateFormat(&quot;yyyy-MM-dd&quot;);\n        System.out.println(fmt.format(date));\n\n        Calendar cal2 = Calendar.getInstance();\n        \/\/ \u5c06Date\u5bf9\u8c61\u4f20\u5230Calendar\u4e2d\n        cal2.setTime(date);\n        System.out.println(cal2.get(Calendar.YEAR));\n\n        \/\/ \u83b7\u53d6\u7cfb\u7edf\u6beb\u79d2\u6570\n        System.out.println(cal2.getTimeInMillis());\n        \/\/ \u8bbe\u7f6e\u7cfb\u7edf\u6beb\u79d2\u6570\n        cal2.setTimeInMillis(1646976305614L);\n    }<\/code><\/pre>\n<h2>\u6cdb\u578b<\/h2>\n<p>\u53c2\u6570\u5316\u7684\u7c7b\u578b<\/p>\n<p>\u6cdb\u578b\uff1a\u6cdb\u578b\u65b9\u6cd5\uff0c\u6cdb\u578b\u7c7b<\/p>\n<p>\u6cdb\u578b\u4e0d\u652f\u6301\u57fa\u672c\u7c7b\u578b\uff0c\u4e0d\u80fd\u5b9e\u4f8b\u5316\u5bf9\u8c61<\/p>\n<p>Java\u4e2d\u7684\u6cdb\u578b\uff0c\u662fJava5\u589e\u52a0\u7684\u7279\u6027<\/p>\n<p>\u64e6\u9664\u6cd5\u6cdb\u578b\uff0cJava\u7684\u6cdb\u578b\u662f\u8bed\u6cd5\u5c42\u9762\u7684\uff0c\u7f16\u8bd1\u4e4b\u540e\uff0c\u6cdb\u578b\u7c7b\u578b\u662fObject<\/p>\n<p>\u5728Java7\u4e4b\u524d\uff1a\u7c7b\u540d&lt;\u6cdb\u578b\u7c7b\u578b&gt; \u53d8\u91cf = new \u7c7b\u540d&lt;\u6cdb\u578b\u7c7b\u578b&gt;();<\/p>\n<p>\u5728Java7\u4e4b\u540e\uff1a\u7c7b\u540d&lt;\u6cdb\u578b\u7c7b\u578b&gt; \u53d8\u91cf = new \u7c7b\u540d&lt;&gt;();<\/p>\n<h2>\u96c6\u5408<\/h2>\n<p><strong>List\u662fCollection\u7684\u5b50\u63a5\u53e3\uff0c\u4e3b\u8981\u5b58\u50a8\u6709\u5e8f\u53ef\u91cd\u590d\u6570\u636e<\/strong><\/p>\n<p>ArrayList\uff1a\u6570\u7ec4\u5217\u8868\uff0c\u4f7f\u7528\u6570\u7ec4\u5b9e\u73b0<\/p>\n<p>List<String> list = new ArrayList&lt;&gt;();<\/p>\n<p>\u8ffd\u52a0\u5143\u7d20\uff1alist.add(\u5143\u7d20);<\/p>\n<p>\u63d2\u5165\u5143\u7d20\uff1alist.add(\u7d22\u5f15\uff0c\u5143\u7d20);<\/p>\n<p>\u4fee\u6539\u5143\u7d20\uff1alist.set(\u7d22\u5f15, \u5143\u7d20);<\/p>\n<p>\u5220\u9664\u5143\u7d20\uff08\u4f9d\u636e\u7d22\u5f15\u5220\u9664\uff09\uff1alist.remove(\u7d22\u5f15);<\/p>\n<p>\u5220\u9664\u5143\u7d20\uff08\u4f9d\u636e\u5143\u7d20\u5220\u9664\uff09\uff1alist.remove(\u5143\u7d20);<\/p>\n<p>\u200b   \u6ce8\u610f\uff1a\u5982\u679c\u6cdb\u578b\u7c7b\u578b\u662fInteger\uff0c\u4f7f\u7528remove\u65f6\uff0c\u4f20\u5165\u5143\u7d20\uff0c\u4f1a\u5f53\u6210\u7d22\u5f15\uff0c\u6240\u4ee5\u9700\u8981\u5c06\u5143\u7d20\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u6210Integer\u6216Object<\/p>\n<p>\u4f9d\u636e\u7d22\u5f15\u83b7\u53d6\u5143\u7d20\uff1alist.get(\u7d22\u5f15)<\/p>\n<p>\u96c6\u5408\u957f\u5ea6\uff1alist.size();<\/p>\n<p>\u6e05\u7a7a\u96c6\u5408\uff1alist.clear();<\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        \/\/ List\u662fCollection\u7684\u5b50\u63a5\u53e3\uff0c\u4e3b\u8981\u5b58\u50a8\u6709\u5e8f\u53ef\u91cd\u590d\u6570\u636e\n        List&lt;String&gt; list = new ArrayList&lt;&gt;();\n        \/\/ \u6dfb\u52a0\u5143\u7d20\n        list.add(&quot;\u4efb\u5747\u5b87&quot;);\n        list.add(&quot;\u4f55\u4e66\u9f99&quot;);\n        System.out.println(list);\n        \/\/ \u63d2\u5165\u5143\u7d20\n        list.add(1, &quot;\u738b\u535a\u6593&quot;);\n        System.out.println(list);\n        \/\/ \u4fee\u6539\u5143\u7d20\n        list.set(1, &quot;\u4efb\u5747\u5b87&quot;);\n        System.out.println(list);\n        \/\/ \u5220\u9664\u5143\u7d20(\u4f9d\u636e\u7d22\u5f15\u5220\u9664)\n        list.remove(2);\n        System.out.println(list);\n        \/\/ \u5220\u9664\u5143\u7d20(\u4f9d\u636e\u5143\u7d20\u5220\u9664)\n        list.remove(&quot;\u4efb\u5747\u5b87&quot;);\n        System.out.println(list);\n        \/\/ \u83b7\u53d6\u5143\u7d20\n        System.out.println(list.get(0));\n        \/\/ \u96c6\u5408\u957f\u5ea6\n        System.out.println(list.size());\n    }<\/code><\/pre>\n<p><strong>\u904d\u5386\u96c6\u5408\u4e09\u79cd\u65b9\u5f0f\uff1a<\/strong><\/p>\n<pre><code class=\"language-Java\">List&lt;Integer&gt; list = new ArrayList&lt;&gt;();\nlist.add(1433);\nlist.add(1521);\nlist.add(3306);\n\/\/ \u904d\u5386\u96c6\u5408\uff0c\u666e\u901afor\u5faa\u73af\nfor(int i=0;i&lt;list.size();i++){\n    System.out.println(list.get(i));\n}\nSystem.out.println(&quot;=============&quot;);\n\/\/ \u904d\u5386\u96c6\u5408\uff0c\u589e\u5f3afor\u5faa\u73af\nfor(Integer num : list){\n    System.out.println(num);\n}\nSystem.out.println(&quot;=============&quot;);\n\/\/ \u904d\u5386\u96c6\u5408\uff0c\u4f7f\u7528\u8fed\u4ee3\u5668\n\/\/ \u83b7\u53d6\u8fed\u4ee3\u5668\nIterator&lt;Integer&gt; it = list.iterator();\n\/\/ \u5224\u65ad\u6709\u6ca1\u6709\u4e0b\u4e00\u6761\u6570\u636e\nwhile(it.hasNext()){\n    \/\/ \u79fb\u52a8\u5230\u4e0b\u4e00\u6761\u6570\u636e\uff0c\u5e76\u83b7\u53d6\u6570\u636e\n    System.out.println(it.next());\n}<\/code><\/pre>\n<p><strong>Collections\uff1a\u96c6\u5408\u5de5\u5177\u7c7b<\/strong><\/p>\n<p>Collections.addAll(\u96c6\u5408, \u5143\u7d20,...)\uff1a\u5411\u96c6\u5408\u4e2d\u6dfb\u52a0\u82e5\u5e72\u5143\u7d20<\/p>\n<p><strong>Collection\u548cCollections\u7684\u533a\u522b<\/strong><\/p>\n<p>\u200b   1.Collection\u662f\u96c6\u5408\u7684\u603b\u63a5\u53e3\uff0c\u662f\u5b58\u50a8\u5355\u4e00\u7c7b\u578b\u7684\u96c6\u5408<\/p>\n<p>\u200b   2.Collections\u662f\u96c6\u5408\u5de5\u5177\u7c7b\uff0c\u63d0\u4f9b\u64cd\u4f5c\u96c6\u5408\u7684\u76f8\u5173\u65b9\u6cd5<\/p>\n<p>\u5224\u65ad\u662f\u5426\u6709\u67d0\u4e32\uff1alist.contains()<\/p>\n<p>\u4f9d\u636e\u5143\u7d20\u67e5\u627e\u7d22\u5f15\uff08\u4ece\u5de6\u5f80\u53f3\u627e\u7b2c\u4e00\u4e2a\uff09\uff1alist.indexOf()<\/p>\n<p>\u4f9d\u636e\u5143\u7d20\u67e5\u627e\u7d22\u5f15\uff08\u4ece\u5de6\u5f80\u53f3\u627e\u6700\u540e\u4e00\u4e2a\uff09\uff1alist.lastIndexOf()<\/p>\n<p>\u5224\u65ad\u96c6\u5408\u662f\u5426\u4e3a\u7a7a\uff1alist.isEmpty()<\/p>\n<p>\u83b7\u53d6\u5b50\u96c6\u5408\uff08\u542b\u5934\u4e0d\u542b\u5c3e\uff09\uff1alist.subList()<\/p>\n<p>\u200b   \u5b9e\u9645\u4e0a\u662f\u4ece\u96c6\u5408\u4e2d\u83b7\u53d6\u4e00\u90e8\u5206\uff0c\u4f46\u662f\u8fd8\u662f\u540c\u4e00\u4e2a\u96c6\u5408\uff0c\u4e00\u4e2a\u4fee\u6539\uff0c\u4f1a\u5f71\u54cd\u53e6\u4e00\u4e2a<\/p>\n<p>\u200b   \u5982\u679c\u60f3\u4e92\u4e0d\u5f71\u54cd\uff0c\u9700\u8981\u5c06list.subList()\u653e\u5230\u96c6\u5408\u5b9e\u73b0\u7c7b\u5982ArrayList\u7684\u6784\u9020\u5668\u4e2d<\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        List&lt;Integer&gt; list = new ArrayList&lt;&gt;();\n        \/*\n         * Collections:\u96c6\u5408\u5de5\u5177\u7c7b\n         * Collections.addAll(\u96c6\u5408, \u5143\u7d20,...)\uff1a\u5411\u96c6\u5408\u4e2d\u6dfb\u52a0\u82e5\u5e72\u5143\u7d20\n         *\/\n        Collections.addAll(list, 1521, 1433, 3306);\n        Collections.addAll(list, 8080,1433);\n        System.out.println(list);\n        \/\/ \u5224\u65ad\u662f\u5426\u6709\u67d0\u5b50\u4e32\n        System.out.println(list.contains(1433));\n        \/\/ \u4f9d\u636e\u5143\u7d20\u67e5\u627e\u7d22\u5f15\uff08\u4ece\u5de6\u5f80\u53f3\u627e\u7b2c\u4e00\u4e2a\uff09\n        System.out.println(list.indexOf(1433));\n        \/\/ \u4f9d\u636e\u5143\u7d20\u67e5\u627e\u7d22\u5f15\uff08\u4ece\u5de6\u5f80\u53f3\u627e\u6700\u540e\u4e00\u4e2a\uff09\n        System.out.println(list.lastIndexOf(1433));\n        \/\/ \u5224\u65ad\u96c6\u5408\u662f\u5426\u4e3a\u7a7a\n        System.out.println(list.isEmpty());\n        System.out.println(list.size() == 0);\n\n        \/*\n         *  \u83b7\u53d6\u5b50\u96c6\u5408(\u542b\u5934\u4e0d\u542b\u5c3e)\n         *  \u5b9e\u9645\u4e0a\u662f\u4ece\u96c6\u5408\u4e2d\u83b7\u53d6\u4e00\u90e8\u5206\uff0c\u4f46\u662f\u8fd8\u662f\u540c\u4e00\u4e2a\u96c6\u5408\uff0c\u4e00\u4e2a\u4fee\u6539\uff0c\u4f1a\u5f71\u54cd\u53e6\u4e00\u4e2a\n         *  \u5982\u679c\u60f3\u4e92\u4e0d\u5f71\u54cd\uff0c\u9700\u8981\u5c06list.subList()\u653e\u5230\u96c6\u5408\u5b9e\u73b0\u7c7b\u7684\u6784\u9020\u5668\u4e2d\n         *\/\n        List&lt;Integer&gt; sub = new ArrayList&lt;&gt;(list.subList(1, 3));\n        sub.set(0, 9090);\n        System.out.println(list);\n        System.out.println(sub);\n    }<\/code><\/pre>\n<p><strong>\u6570\u7ec4\u8f6cList\uff1a<\/strong><\/p>\n<p>Arrays.asList()\uff1a\u8f6c\u6210\u4e86\u53ea\u8bfb\u96c6\u5408<\/p>\n<p>\u6b63\u786e\u505a\u6cd5\uff1a\u5c06Arrays.asList()\u653e\u5728List\u5b9e\u73b0\u7c7b\u7684\u6784\u9020\u5668\u4e2d<\/p>\n<p>List&lt;\u6cdb\u578b\u7c7b\u578b&gt; \u53d8\u91cf = new ArrayList&lt;&gt;(Arrays.asList(\u6570\u7ec4));<\/p>\n<pre><code class=\"language-Java\">    Integer[] nums = { 1, 2, 3 };\n    List&lt;Integer&gt; list = new ArrayList&lt;&gt;(Arrays.asList(nums));\n    list.add(0, 10);\n    System.out.println(list);<\/code><\/pre>\n<p><strong>List\u8f6c\u6570\u7ec4\uff1a<\/strong><\/p>\n<p>\u65b9\u5f0f\u4e00\uff1a\u7c7b\u578b[] \u6570\u7ec4 = list.toArray(new \u7c7b\u578b[0]);<\/p>\n<p>\u65b9\u5f0f\u4e8c\uff1a\u7c7b\u578b[] \u6570\u7ec4 = new \u7c7b\u578b[\u96c6\u5408\u957f\u5ea6];<\/p>\n<p>\u200b               \u96c6\u5408.toArray(arr);<\/p>\n<pre><code class=\"language-Java\">        \/\/ \u65b9\u5f0f\u4e00\n        Integer[] arr = list.toArray(new Integer[0]);\n        \/\/ \u65b9\u5f0f\u4e8c\n\/\/      Integer[] arr = new Integer[list.size()];\n\/\/      list.toArray(arr);\n        System.out.println(Arrays.toString(arr));<\/code><\/pre>\n<p><strong>\u6392\u5e8f<\/strong><\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        List&lt;Integer&gt; list = new ArrayList&lt;&gt;();\n        Collections.addAll(list, 3306, 1433, 1521);\n        \/\/ \u6b63\u5e8f\u6392\u5e8f\n        Collections.sort(list);\n        System.out.println(list);\n        \/*\n         *  \u6b63\u5e8f\u6392\u5e8f\uff1a\u7b2c\u4e00\u4e2a\u6570\u51cf\u7b2c\u4e8c\u4e2a\u6570\n         *  \u5012\u53d9\u6392\u5e8f\uff1a\u7b2c\u4e8c\u4e2a\u6570\u51cf\u7b2c\u4e00\u4e2a\u6570\n         *\/\n        Collections.sort(list, new Comparator&lt;Integer&gt;() {\n            @Override\n            public int compare(Integer o1, Integer o2) {\n                \/\/ TODO Auto-generated method stub\n                return o2 - o1;\n            }\n\n        });\n        System.out.println(list);\n\n        list.sort(new Comparator&lt;Integer&gt;() {\n            @Override\n            public int compare(Integer o1, Integer o2) {\n                \/\/ TODO Auto-generated method stub\n                return o1 - o2;\n            }\n\n        });\n        System.out.println(list);\n\n        List&lt;String&gt; strList = new ArrayList&lt;&gt;();\n        Collections.addAll(strList, &quot;a&quot;, &quot;b&quot;, &quot;c&quot;, &quot;z&quot;, &quot;e&quot;);\n        Collections.sort(strList);\/\/ \u6b63\u5e8f\n        System.out.println(strList);\n        \/\/ \u5012\u5e8f\n        strList.sort(new Comparator&lt;String&gt;() {\n            @Override\n            public int compare(String o1, String o2) {\n                \/\/ TODO Auto-generated method stub\n                return o2.compareTo(o1);\n            }\n        });\n        System.out.println(strList);\n    }<\/code><\/pre>\n<p><strong>LinkedList\uff1a\u94fe\u8868\u96c6\u5408<\/strong><\/p>\n<p>\u662f\u7528\u94fe\u8868\u5b9e\u73b0\u7684<\/p>\n<p><strong>ArrayList\u548cLinkedList\u7684\u533a\u522b\uff1a<\/strong><\/p>\n<p>\u200b   1.ArrayList\u662f\u7528\u6570\u7ec4\u5b9e\u73b0\u7684\uff0c\u5728\u5185\u5b58\u4e2d\u8fde\u7eed\u7684\uff0c\u9002\u5408\u904d\u5386\u548c\u8ffd\u52a0<\/p>\n<p>\u200b   2.LinkedLIst\u662f\u7528\u94fe\u8868\u5b9e\u73b0\u7684\uff0c\u5728\u5185\u5b58\u4e2d\u4e0d\u662f\u8fde\u7eed\u7684\uff0c\u9002\u5408\u63d2\u5165\u548c\u5220\u9664<\/p>\n<p>\u200b       LinkedList\u80fd\u591f\u5b9e\u73b0\u961f\u5217\u548c\u6808<\/p>\n<p><strong>\u961f\u5217\uff1a\u5148\u8fdb\u5148\u51fa\uff08FIFO\uff09<\/strong><\/p>\n<p><strong>\u6808\uff1a\u5148\u8fdb\u540e\u51fa\uff08FILO\uff09<\/strong><\/p>\n<p>Queue&lt;\u7c7b\u578b&gt; queue = new LinkedList&lt;&gt;();<\/p>\n<p>\u6dfb\u52a0\u5143\u7d20\uff1aqueue.offer();<\/p>\n<p>\u83b7\u53d6\u5143\u7d20\uff08\u4e0d\u5220\u9664\uff09\uff1aqueue.peek();<\/p>\n<p>\u83b7\u53d6\u5143\u7d20\u5e76\u5220\u9664\uff1aqueue.poll();<\/p>\n<p>Deque&lt;\u7c7b\u578b&gt; statck = new LinkedList&lt;&gt;();<\/p>\n<p>\u8fdb\u6808\uff1astack.push();<\/p>\n<p>\u51fa\u6808\uff1astack.pop();<\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        Queue&lt;Integer&gt; queue = new LinkedList&lt;&gt;();\n        \/\/ \u6dfb\u52a0\u65b9\u6cd5\n        queue.offer(10);\n        queue.offer(20);\n        queue.offer(30);\n        System.out.println(queue);\n        \/\/ \u83b7\u53d6\u5143\u7d20(\u4e0d\u5220\u9664)\n\/\/      System.out.println(queue.peek());\n\/\/      System.out.println(queue.peek());\n\/\/      \/\/ \u83b7\u53d6\u5143\u7d20\u5e76\u5220\u9664\n\/\/      System.out.println(queue.poll());\n\/\/      System.out.println(queue.poll());\n\/\/      System.out.println(queue.poll());\n\n        for (Integer num : queue) {\n            System.out.println(num);\n        }\n\n        System.out.println(&quot;================&quot;);\n\n        Deque&lt;Integer&gt; stack = new LinkedList&lt;&gt;();\n        \/\/ \u8fdb\u6808\n        stack.push(10);\n        stack.push(20);\n        stack.push(30);\n        System.out.println(stack);\n        \/\/ \u51fa\u6808\n\/\/      System.out.println(stack.pop());\n\/\/      System.out.println(stack.pop());\n\/\/      System.out.println(stack.pop());\n\n        for(Integer n : stack) {\n            System.out.println(n);\n        }\n        System.out.println(stack.size());\n        while(stack.size()&gt;0) {\n            System.out.println(stack.pop());\n        }<\/code><\/pre>\n<p><strong>Set\u96c6\u5408\u662fCollection\u7684\u5b50\u63a5\u53e3\uff0c\u65e0\u5e8f\u5b58\u50a8\uff0c\u4e0d\u53ef\u91cd\u590d\u5b58\u50a8\uff0c\u53ef\u4ee5null\u503c<\/strong><\/p>\n<p>HashSet\uff1a\u65e0\u5e8f\u7684<\/p>\n<p>LinkedHashSet\uff1a\u6dfb\u52a0\u7684\u987a\u5e8f<\/p>\n<p>TreeSet\uff1a\u6392\u5e8f\u7684\uff08\u9ed8\u8ba4\u662f\u6b63\u5e8f\u6392\u5e8f\uff09<\/p>\n<p>\u6dfb\u52a0\u5143\u7d20\uff1aadd()<\/p>\n<p>\u4f9d\u636e\u5143\u7d20\u5220\u9664\uff1aremove(\u5143\u7d20)<\/p>\n<p>\u83b7\u53d6\u957f\u5ea6\uff1asize()<\/p>\n<p><strong>\u904d\u5386Set\u96c6\u5408<\/strong><\/p>\n<pre><code class=\"language-Java\">        \/\/ \u904d\u5386Set\u96c6\u5408\n        for (String str : phone) {\n            System.out.println(str);\n        }\n        System.out.println(&quot;=============&quot;);\n        Iterator&lt;String&gt; it = phone.iterator();\n        while (it.hasNext()) {\n            System.out.println(it.next());\n        }<\/code><\/pre>\n<p><strong>Set\u96c6\u5408\u8f6cList\u96c6\u5408\uff0c\u653e\u5230List\u96c6\u5408\u5b9e\u73b0\u7c7b\u7684\u6784\u9020\u5668\u4e2d<\/strong><\/p>\n<p><strong>List\u96c6\u5408\u8f6cSet\u96c6\u5408\uff0c\u653e\u5230Set\u96c6\u5408\u5b9e\u73b0\u7c7b\u7684\u6784\u9020\u5668\u4e2d<\/strong><\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        Set&lt;String&gt; phone = new HashSet&lt;&gt;();\n        phone.add(&quot;13312345688&quot;);\n        phone.add(&quot;13912345688&quot;);\n        phone.add(&quot;13612345688&quot;);\n        \/\/ Set\u96c6\u5408\u8f6cList\uff1a\u653e\u5230List\u96c6\u5408\u5b9e\u73b0\u7c7b\u7684\u6784\u9020\u5668\u4e2d\n        List&lt;String&gt; list = new ArrayList&lt;&gt;(phone);\n        list.add(1, &quot;13612345688&quot;);\n        System.out.println(list);\n\n        \/\/ List\u96c6\u5408\u8f6cSet\u96c6\u5408\uff0c\u653e\u5230Set\u96c6\u5408\u5b9e\u73b0\u7c7b\u7684\u6784\u9020\u5668\u4e2d\n        Set&lt;String&gt; set = new HashSet&lt;&gt;(list);\n        System.out.println(set);\n    }<\/code><\/pre>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        \/\/ \u5012\u5e8f\u6392\u5e8f\uff1a\u5c06\u6bd4\u8f83\u5668\u653e\u5728TreeSet\u7684\u6784\u9020\u5668\u4e2d\n        Set&lt;String&gt; phone = new TreeSet&lt;&gt;(new Comparator&lt;String&gt;() {\n\n            @Override\n            public int compare(String o1, String o2) {\n                \/\/ TODO Auto-generated method stub\n                return o2.compareTo(o1);\n            }\n\n        });\n        phone.add(&quot;13312345688&quot;);\n        phone.add(&quot;13912345688&quot;);\n        phone.add(&quot;13612345688&quot;);\n        System.out.println(phone);\n    }<\/code><\/pre>\n<p><strong>Map\u96c6\u5408\u4ee5\u952e\u503c\u5bf9\u7684\u5f62\u5f0f\u5b58\u5728\uff0c\u952e\u662f\u4e0d\u80fd\u91cd\u590d\u7684\uff0c\u503c\u662f\u53ef\u4ee5\u91cd\u590d\u7684<\/strong><\/p>\n<p>HashMap\uff1a\u65e0\u5e8f\u7684<\/p>\n<p>LinkedHashMap\uff1a\u6dfb\u52a0\u7684\u987a\u5e8f<\/p>\n<p>TreeMap\uff1a\u6392\u5e8f\u7684\uff08\u9ed8\u8ba4\u6309\u7167\u952e\u7684\u6b63\u5e8f\u987a\u5e8f\uff09<\/p>\n<p>\u6dfb\u52a0\uff1aput(\u952e, \u503c)<\/p>\n<p>\u4fee\u6539\uff1aput()<\/p>\n<p>\u5220\u9664\uff08\u4f9d\u636e\u952e\u5220\u9664\uff09\uff1aremove(\u952e)<\/p>\n<p>\u662f\u5426\u5305\u542b\u67d0\u952e\uff1acontainsKey()<\/p>\n<p>\u83b7\u53d6\u957f\u5ea6\uff1asize()<\/p>\n<p>\u83b7\u53d6\u952e\u96c6\u5408\uff1akeySet()<\/p>\n<p>\u83b7\u53d6\u503c\u96c6\u5408\uff1avalues()<\/p>\n<p>\u4f9d\u636e\u952e\u83b7\u53d6\u503c\uff1aget(\u952e)<\/p>\n<p>\u6e05\u7a7a\u96c6\u5408\uff1aclear()<\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        \/*\n         * Map\u96c6\u5408\uff0c\u662f\u4e00\u79cd\u952e\u503c\u5bf9\u96c6\u5408\n         * HashMap\uff1a\u65e0\u5e8f\u7684\n         * LinkedHashMap\uff1a\u6dfb\u52a0\u7684\u987a\u5e8f\n         * TreeMap\uff1a\u6392\u5e8f\u7684\uff08\u9ed8\u8ba4\u6309\u7167\u952e\u7684\u6b63\u5e8f\u6392\u5e8f\uff09\n         *\/\n        Map&lt;String,String&gt; map = new HashMap&lt;&gt;();\n        \/\/ \u6dfb\u52a0\n        map.put(&quot;name&quot;, &quot;\u9ad8\u65af\u6797&quot;);\n        map.put(&quot;gender&quot;, &quot;\u7537&quot;);\n        map.put(&quot;job&quot;, &quot;\u67b6\u6784\u5e08&quot;);\n        System.out.println(map);\n        \/\/ \u4fee\u6539\n        map.put(&quot;job&quot;, &quot;\u7a0b\u5e8f\u5458&quot;);\n        System.out.println(map);\n        \/\/ \u5220\u9664(\u4f9d\u636e\u952e\u5220\u9664)\n        map.remove(&quot;job&quot;);\n        System.out.println(map);\n\n        \/\/ \u662f\u5426\u5305\u542b\u67d0\u952e\n        System.out.println(map.containsKey(&quot;name&quot;));\n        \/\/ \u96c6\u5408\u957f\u5ea6\n        System.out.println(map.size());\n        \/\/ \u83b7\u53d6\u952e\u96c6\u5408\n        System.out.println(map.keySet());\n        \/\/ \u83b7\u53d6\u503c\u96c6\u5408\n        System.out.println(map.values());\n        \/\/ \u4f9d\u636e\u952e\u83b7\u53d6\u503c\n        System.out.println(map.get(&quot;name&quot;));\n        \/\/ \u6e05\u7a7a\u96c6\u5408\n        map.clear();\n        System.out.println(map.size());\n    }<\/code><\/pre>\n<p><strong>\u904d\u5386Map\u96c6\u5408<\/strong><\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        Map&lt;String, String&gt; map = new HashMap&lt;&gt;();\n        map.put(&quot;name&quot;, &quot;\u9ad8\u65af\u6797&quot;);\n        map.put(&quot;gender&quot;, &quot;\u7537&quot;);\n        map.put(&quot;job&quot;, &quot;\u7a0b\u5e8f\u5458&quot;);\n\n        \/\/ \u904d\u5386Map\u96c6\u5408\u65b9\u5f0f\u4e00\uff0c\u901a\u8fc7\u904d\u5386\u952e\u96c6\u5408\n        for (String str : map.keySet()) {\n            System.out.println(str + &quot;\\t&quot; + map.get(str));\n        }\n        System.out.println(&quot;=============&quot;);\n        \/*\n         *  \u904d\u5386Map\u96c6\u5408\u65b9\u5f0f\u4e8c\uff1a\u901a\u8fc7\u904d\u5386\u952e\u503c\u5bf9\u5bf9\u8c61 \n         *  Entry\uff1a\u952e\u503c\u5bf9\u5bf9\u8c61\n         *  entry.getKey()\uff1a\u83b7\u53d6\u952e\n         *  entry.getValue()\uff1a\u83b7\u53d6\u503c\n         *\/\n        for (Entry&lt;String, String&gt; entry : map.entrySet()) {\n            System.out.println(entry.getKey() + &quot;\\t&quot; + entry.getValue());\n        }\n\n        System.out.println(&quot;==============&quot;);\n        \/\/ \u53ea\u904d\u5386\u503c\n        for(String s : map.values()) {\n            System.out.println(s);\n        }\n    }<\/code><\/pre>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        \/\/ Map&lt;String,String&gt; map = new LinkedHashMap&lt;&gt;();\n        \/\/ \u5012\u5e8f\uff1a\u5c06\u6bd4\u8f83\u5668\u653e\u5728TreeMap\u7684\u6784\u9020\u5668\u4e2d\n        Map&lt;String, String&gt; map = new TreeMap&lt;&gt;(new Comparator&lt;String&gt;() {\n\n            @Override\n            public int compare(String o1, String o2) {\n                return o2.compareTo(o1);\n            }\n        });\n        map.put(&quot;name&quot;, &quot;\u9ad8\u65af\u6797&quot;);\n        map.put(&quot;gender&quot;, &quot;\u7537&quot;);\n        map.put(&quot;job&quot;, &quot;\u67b6\u6784\u5e08&quot;);\n        System.out.println(map);\n    }<\/code><\/pre>\n<p><strong>Properties\uff1a\u5c5e\u6027\u96c6\u5408\uff0c\u952e\u503c\u5bf9\u90fd\u662f\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u4fdd\u5b58\u5230\u6587\u4ef6\u4e2d<\/strong><\/p>\n<p>\u6dfb\u52a0\u503c\uff1asetProperty(\u952e\uff0c\u503c);<\/p>\n<p>\u83b7\u53d6\u503c\uff1agetProperty(\u952e);<\/p>\n<p>\u83b7\u53d6\u503c\uff1agetProperty(\u952e\uff0c\u9ed8\u8ba4\u503c);  \u5982\u679c\u6ca1\u6709\u952e\uff0c\u5c31\u8fd4\u56de\u9ed8\u8ba4\u503c<\/p>\n<p>HashMap\u548cHashtable\u7684\u533a\u522b\uff1a<\/p>\n<p>1.HashMap\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\uff0c\u901f\u5ea6\u7a0d\u5feb\uff0c\u63a8\u8350\u4f7f\u7528\uff0c\u952e\u503c\u53ef\u4ee5\u5b58\u653enull<\/p>\n<p>2.Hashtable\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u901f\u5ea6\u7a0d\u6162\uff0c\u4e0d\u63a8\u8350\u4f7f\u7528\uff0c\u952e\u503c\u4e0d\u80fd\u5b58\u653enull<\/p>\n<h2>\u5f02\u5e38<\/h2>\n<p>\u8bed\u6cd5\uff1atry-catch\uff0ctry-catch-finally\uff0ctry-finally<\/p>\n<p>\u3010try-catch\u3011<\/p>\n<p>try {<\/p>\n<p>\u200b   \/\/ \u53ef\u80fd\u4f1a\u51fa\u73b0\u5f02\u5e38\u7684\u4ee3\u7801<\/p>\n<p>} catch(\u5f02\u5e38\u5bf9\u8c61) {<\/p>\n<p>\u200b   \/\/ \u5904\u7406\u5f02\u5e38\uff0c\u6355\u6349\u5230\u5f02\u5e38\u4e4b\u540e\u4f1a\u6267\u884c\u7684\u4ee3\u7801<\/p>\n<p>}<\/p>\n<p>\u3010try-catch-finally\u3011<\/p>\n<p>try {<\/p>\n<p>\u200b   \/\/ \u53ef\u80fd\u4f1a\u51fa\u73b0\u5f02\u5e38\u7684\u4ee3\u7801<\/p>\n<p>} catch(\u5f02\u5e38\u5bf9\u8c61) {<\/p>\n<p>\u200b   \/\/ \u5904\u7406\u5f02\u5e38\uff0c\u6355\u6349\u5230\u5f02\u5e38\u4e4b\u540e\u4f1a\u6267\u884c\u7684\u4ee3\u7801<\/p>\n<p>} finally{<\/p>\n<p>\u200b   \/\/ \u65e0\u8bba\u662f\u5426\u6709\u5f02\u5e38\uff0c\u90fd\u4f1a\u6267\u884c(\u6ce8\u610f\uff1aSystem.exit(0)\u9000\u51fa\u7a0b\u5e8f\u9664\u5916)<\/p>\n<p>}<\/p>\n<p>\u3010try-finally\u3011<\/p>\n<p>try {<\/p>\n<p>\u200b   \/\/ \u53ef\u80fd\u4f1a\u51fa\u73b0\u5f02\u5e38\u7684\u4ee3\u7801<\/p>\n<p>} finally{<\/p>\n<p>\u200b   \/\/ \u65e0\u8bba\u662f\u5426\u6709\u5f02\u5e38\uff0c\u90fd\u4f1a\u6267\u884c(\u6ce8\u610f\uff1aSystem.exit(0)\u9000\u51fa\u7a0b\u5e8f\u9664\u5916)<\/p>\n<p>}<\/p>\n<table>\n<thead>\n<tr>\n<th>Throwable\uff08Java\u8bed\u8a00\u4e2d\u6240\u6709\u9519\u8bef\u7684\u7236\u7c7b\uff09<\/th>\n<th><\/th>\n<th>-- Exception\uff08\u5f02\u5e38\uff09<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><\/td>\n<td>-- \u8fd0\u884c\u65f6\u5f02\u5e38\uff08\u975e\u68c0\u67e5\u5f02\u5e38\uff09\uff0cRuntimeException<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th><\/th>\n<th>-- ArithmeticException\uff08\u7b97\u672f\u5f02\u5e38\uff09<\/th>\n<th><\/th>\n<th><\/th>\n<th>-- NumberFormatException\uff08\u6570\u5b57\u683c\u5f0f\u5f02\u5e38\uff09<\/th>\n<th><\/th>\n<th><\/th>\n<th>-- NullPointerException\uff08\u7a7a\u6307\u9488\u5f02\u5e38\uff09<\/th>\n<th><\/th>\n<th><\/th>\n<th>-- StringIndexOutOfBoundsException\uff08\u5b57\u7b26\u4e32\u7d22\u5f15\u8d8a\u754c\u5f02\u5e38\uff09<\/th>\n<th><\/th>\n<th><\/th>\n<th>-- ArrayIndexOutOfBoundsException\uff08\u6570\u7ec4\u7d22\u5f15\u8d8a\u754c\u5f02\u5e38\uff09<\/th>\n<th><\/th>\n<th><\/th>\n<th>-- IndexOutOfBoundsException\uff08\u7d22\u5f15\u8d8a\u754c\u5f02\u5e38\uff09<\/th>\n<th><\/th>\n<th><\/th>\n<th>-- ClassCastException\uff08\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38\uff09<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><\/td>\n<td>-- \u975e\u8fd0\u884c\u65f6\u5f02\u5e38\uff08\u7f16\u8bd1\u5f02\u5e38\uff0c\u68c0\u67e5\u5f02\u5e38\uff09\uff0cException<\/td>\n<\/tr>\n<tr>\n<\/tr>\n<tr>\n<td>-- Error\uff08\u9519\u8bef\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Exception\uff1a\u7a0b\u5e8f\u4e2d\u51fa\u73b0\u7684\u5f02\u5e38<\/p>\n<p>Error\uff1a\u4e00\u822c\u6307\u865a\u62df\u673a\u51fa\u73b0\u7684\u9519\u8bef<\/p>\n<p>\u8fd0\u884c\u65f6\u5f02\u5e38\uff1a\u7f16\u5199\u7a0b\u5e8f\u548c\u7f16\u8bd1\u7a0b\u5e8f\u65f6\u4e0d\u4f1a\u51fa\u73b0\u5f02\u5e38\uff0c\u4f46\u662f\u8fd0\u884c\u7684\u65f6\u5019\u6709\u53ef\u80fd\u51fa\u73b0\u5f02\u5e38<\/p>\n<p>\u975e\u8fd0\u884c\u65f6\u5f02\u5e38\uff1a\u5728\u7f16\u5199\u7a0b\u5e8f\u6216\u7f16\u8bd1\u7a0b\u5e8f\u65f6\u5c31\u51fa\u73b0\u4e86\u5f02\u5e38\uff0c\u9700\u8981\u5f02\u5e38\u5904\u7406<\/p>\n<p>catch\uff1a\u53ef\u4ee5\u6709\u591a\u4e2a\uff0c\u4f46\u662f\u8303\u56f4\u5fc5\u987b\u7531\u5c0f\u5230\u5927<\/p>\n<pre><code class=\"language-Java\">public class Test {\n\n    public static void main(String[] args) {\n        \/*\n         * try-catch     try-catch-finally    try-finally\n         *  \u3010try-catch \u3011\n         *  try{\n         *      \/\/ \u53ef\u80fd\u4f1a\u51fa\u73b0\u5f02\u5e38\u7684\u4ee3\u7801\n         *  }catch(\u5f02\u5e38\u5bf9\u8c61){\n         *      \/\/ \u5904\u7406\u5f02\u5e38\uff0c\u6355\u6349\u5230\u5f02\u5e38\u4e4b\u540e\u4f1a\u6267\u884c\u7684\u4ee3\u7801\n         *  }\n         * \n         *  catch\u53ef\u4ee5\u6709\u591a\u4e2a\uff0c\u4f46\u662f\u8303\u56f4\u5fc5\u987b\u662f\u7531\u5c0f\u5230\u5927\n         *  \n         *  \u5e38\u89c1\u7684\u8fd0\u884c\u65f6\u5f02\u5e38\uff1a\n         *  ArithmeticException:\u7b97\u672f\u5f02\u5e38\n         *  NumberFormatException:\u6570\u5b57\u683c\u5f0f\u5f02\u5e38\n         *  NullPointerException:\u7a7a\u6307\u9488\u5f02\u5e38\n         *  StringIndexOutOfBoundsException:\u5b57\u7b26\u4e32\u7d22\u5f15\u8d8a\u754c\u5f02\u5e38\n         *  ArrayIndexOutOfBoundsException:\u6570\u7ec4\u7d22\u5f15\u8d8a\u754c\u5f02\u5e38\n         *  IndexOutOfBoundsException:\u7d22\u5f15\u8d8a\u754c\u5f02\u5e38\n         *  ClassCastException:\u7c7b\u578b\u8f6c\u6362\u5f02\u5e38\n         *\/\n        try {\n\n\/\/          int a = 0 \/ 0;\n\n\/\/          Integer.parseInt(&quot;abc&quot;);\n\n\/\/          String str = null;\n\/\/          str.length();\n\n\/\/          String str = &quot;&quot;;\n\/\/          str.charAt(0);\n\n\/\/          int[] nums = new int[0];\n\/\/          nums[0] = 10;\n\n\/\/          List&lt;Integer&gt; list = new ArrayList&lt;&gt;();\n\/\/          list.set(0, 10);\n\n\/\/          Object obj = &quot;abc&quot;;\n\/\/          Integer num = (Integer)obj;\n\n            Object[] num = {1,2,3};\n            Integer[] aa = (Integer[])num;\n\n        } catch (NumberFormatException e) {\n            System.out.println(&quot;\u5f02\u5e38\u7c7b\u578b\uff1a&quot; + e.getClass());\n            System.out.println(&quot;\u5f02\u5e38\u4fe1\u606f\uff1a&quot; + e.getMessage());\n        } catch (ArithmeticException e) {\n            System.out.println(&quot;\u7b97\u672f\u5f02\u5e38&quot;);\n        } catch (Exception e) {\n            System.out.println(&quot;\u5f02\u5e38\u7c7b\u578b\uff1a&quot; + e.getClass());\n            System.out.println(&quot;\u5f02\u5e38\u4fe1\u606f\uff1a&quot; + e.getMessage());\n        }\n        System.out.println(&quot;good&quot;);\n    }\n\n}<\/code><\/pre>\n<p>\u629b\u5f02\u5e38\uff1a<\/p>\n<p>1.\u5728\u65b9\u6cd5\u5b9a\u4e49\u65f6\uff0c\u6307\u5b9a\u80fd\u591f\u629b\u51fa\u54ea\u4e9b\u5f02\u5e38\u7684\u7c7b\u578b<\/p>\n<p>2.throw new \u5f02\u5e38\u5bf9\u8c61();<\/p>\n<p>\u81ea\u5b9a\u4e49\u5f02\u5e38\uff1a\u53ef\u4ee5\u7ee7\u627fRuntimeException\uff0c\u8c03\u7528\u4e00\u4e2a\u7236\u7c7b\u7684\u6709\u53c2\u6784\u9020\u65b9\u6cd5<\/p>\n<pre><code class=\"language-Java\">public class Test02 {\n\n    public static void getDate(String s) {\n        SimpleDateFormat fmt = new SimpleDateFormat(&quot;yyyy-MM-dd&quot;);\n        Date date = null;\n        try {\n            date = fmt.parse(s);\n        } catch (ParseException e) {\n            \/\/ TODO Auto-generated catch block\n            e.printStackTrace();\n            System.out.println(&quot;\u51fa\u73b0\u4e86\u65e5\u671f\u8f6c\u6362\u5f02\u5e38&quot;);\n        }\n        System.out.println(date);\n\n    }\n    \/*\n     *  \u91cd\u5199\u4e2d\uff1a\n     *  \u5b50\u7c7b\u79f0\u8c22\u65b9\u6cd5\u7684\u5f02\u5e38\u5bf9\u8c61\u8981\u5c0f\u4e8e\u7b49\u4e8e\u7236\u7c7b\u7684\u5f02\u5e38\u5bf9\u8c61\n     *  \u7236\u7c7b\u7684\u65b9\u6cd5\u6ca1\u6709\u5f02\u5e38\uff0c\u5b50\u7c7b\u91cd\u5199\u7684\u65b9\u6cd5\u4e5f\u4e0d\u80fd\u6709\u5f02\u5e38\u51fa\u73b0\n     *\/\n    public static void getDate2(String s) throws ParseException {\n        SimpleDateFormat fmt = new SimpleDateFormat(&quot;yyyy-MM-dd&quot;);\n        Date date = fmt.parse(s);\n        System.out.println(date);\n    }\n\n    \/*\n     *  \u629b\u5f02\u5e38\uff1a\n     *  1.\u5728\u65b9\u6cd5\u5b9a\u4e49\u65f6\uff0c\u6307\u5b9a\u80fd\u591f\u629b\u51fa\u54ea\u4e9b\u7c7b\u578b\u7684\u5f02\u5e38\n     *  2.\u629b\u51fa\u5f02\u5e38\uff1athrow new \u5f02\u5e38\u5bf9\u8c61()\n     *\/\n    public static void setAge(int age) throws AgeException {\n        if (age &lt; 0) {\n            throw new AgeException(&quot;\u5e74\u9f84\u9519\u8bef&quot;);\n        }\n        System.out.println(&quot;\u5e74\u9f84\uff1a&quot; + age);\n    }\n\n    public static void main(String[] args) {\n\n        getDate(&quot;2000-03&quot;);\n        try {\n            getDate2(&quot;2022-03&quot;);\n        } catch (ParseException e) {\n            \/\/ TODO Auto-generated catch block\n            e.printStackTrace();\n            System.out.println(&quot;\u51fa\u73b0\u4e86\u65e5\u671f\u8f6c\u6362\u5f02\u5e38&quot;);\n        }\n        System.out.println(&quot;=========================&quot;);\n        try {\n            setAge(-10);\n        } catch (Exception e) {\n            \/\/ TODO Auto-generated catch block\n            \/\/ e.printStackTrace();\n            System.out.println(&quot;\u5e74\u9f84\u5f02\u5e38&quot;);\n        }\n        System.out.println(&quot;ok&quot;);\n\n        setAge(10);\n\n    }\n\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">public class AgeException extends RuntimeException {\n\n    public AgeException(String message) {\n        super(message);\n    }\n\n}<\/code><\/pre>\n<p>try\uff1a\u5c06\u6709\u53ef\u80fd\u51fa\u73b0\u5f02\u5e38\u7684\u4ee3\u7801\u653e\u5728try\u91cc<\/p>\n<p>catch\uff1a\u901a\u8fc7\u5927\u4e8e\u7b49\u4e8e\u672c\u8eab\u5f02\u5e38\u8fdb\u884c\u6355\u83b7<\/p>\n<p>finally\uff1a\u65e0\u8bba\u662f\u5426\u6709\u5f02\u5e38\uff0c\u90fd\u4f1a\u6267\u884c\u7684\u4ee3\u7801\uff08System.exit(0)\u9000\u51fa\u7a0b\u5e8f\u9664\u5916\uff09<\/p>\n<p>try\u53ef\u4ee5\u5206\u522b\u548ccatch\uff0cfinally\u8fde\u7528\uff0c\u4e5f\u53ef\u4ee5\u4e09\u4e2a\u4e00\u8d77\u4f7f\u7528<\/p>\n<p>try\uff0ccatch\u91cc\u6709return\uff0cfinally\u4e5f\u4f1a\u6267\u884c\uff0c\u4e14\u5728return\u4e4b\u524d\u6267\u884c<\/p>\n<pre><code class=\"language-Java\">public class Test04 {\n\n    public static int show() {\n        int a = 1;\n        try {\n            return a++;\n        }catch(Exception e) {\n            return a++;\n        }finally {\n            return a++;\n        }\n    }\n\n    public static void main(String[] args) {\n        System.out.println(show());\/\/ 2\n    }\n\n}\n<\/code><\/pre>\n<p>final,finally,finalize\u7684\u533a\u522b\uff1a<\/p>\n<p>final\u4fee\u9970\u7c7b\u4e0d\u53ef\u88ab\u7ee7\u627f\uff0c\u4fee\u9970\u65b9\u6cd5\u4e0d\u53ef\u88ab\u91cd\u5199\uff0c\u4fee\u9970\u53d8\u91cf\u503c\u4e0d\u80fd\u6539\u53d8<\/p>\n<p>finally\u5728\u5f02\u5e38\u5904\u7406\u4e2d\uff0c\u4e00\u5b9a\u80fd\u6267\u884c\u7684\u90e8\u5206\uff08\u9664\u4e86System.exit(0)\uff09<\/p>\n<p>finalize\u662fObject\u4e2d\u7684\u65b9\u6cd5\uff0c\u5728\u9500\u6bc1\u5bf9\u8c61\u4e4b\u524d\u8c03\u7528\uff0c\u4e0d\u5efa\u8bae\u91cd\u5199<\/p>\n<h2>File<\/h2>\n<p>File\u5728io\u5305\u4e2d<\/p>\n<p>IO\uff1aInput\uff0cOutput\uff0c\u8f93\u5165\u8f93\u51fa<\/p>\n<p>\u6587\u4ef6\u8def\u5f84\uff1a\u63a8\u8350\u4f7f\u7528\u76f8\u5bf9\u8def\u5f84\uff0c\u4e0d\u8981\u4f7f\u7528\u7edd\u5bf9\u8def\u5f84\uff08\u5b8c\u6574\u7684\u8def\u5f84\uff0c\u5982d:\\a.txt\uff09<\/p>\n<p>\u200b                   \u4f7f\u7528\u7edd\u5bf9\u8def\u5f84\u4e0d\u80fd\u8de8\u5e73\u53f0<\/p>\n<p>\u76f8\u5bf9\u8def\u5f84\uff0c\u662f\u4ece\u9879\u76ee\u8def\u5f84\u5f00\u59cb<\/p>\n<p>File file = new File(&quot;files\/a.txt&quot;);<\/p>\n<p>\u5224\u65ad\u6587\u4ef6\u662f\u5426\u5b58\u5728\uff1afile.exists()<\/p>\n<p>\u521b\u5efa\u6587\u4ef6\uff1afile.createNewFile()<\/p>\n<p>\u6587\u4ef6\u957f\u5ea6\uff1afile.length()<\/p>\n<p>\u6587\u4ef6\u8def\u5f84\uff08\u76f8\u5bf9\u8def\u5f84\uff09\uff1afile.getPath()<\/p>\n<p>\u8def\u5f84\u5206\u9694\u7b26\uff1a\/(Unix\u3001Linux\u7684\u5206\u9694\u7b26\uff0cWindows\u4e5f\u8bc6\u522b)<\/p>\n<p>\u4e0d\u8981\u4f7f\u7528 \\ \uff08\u53ea\u6709DOS\u548cWindows\u8bc6\u522b\uff09<\/p>\n<p>\u83b7\u53d6\u5f53\u524d\u7cfb\u7edf\u7684\u5206\u9694\u7b26\uff1aFile.separator<\/p>\n<p>\u6587\u4ef6\u8def\u5f84\uff08\u7edd\u5bf9\u8def\u5f84\uff09\uff1afile.getAbsolutePath()<\/p>\n<p>\u8bbe\u7f6e\u6700\u540e\u4fee\u6539\u65f6\u95f4\uff1afile.setLastModified()<\/p>\n<p>\u83b7\u53d6\u6700\u540e\u4fee\u6539\u8bbe\u7f6e\uff1afile.lastModified()<\/p>\n<p>\u53ea\u83b7\u53d6\u6587\u4ef6\u540d\uff08\u4e0d\u5305\u542b\u8def\u5f84\uff09\uff1afile.getName()<\/p>\n<p>\u83b7\u53d6\u7236\u7ea7\u540d\u79f0\uff1afile.getParent()<\/p>\n<p>\u8bbe\u7f6e\u53ea\u8bfb\uff1afile.setReadOnly()<\/p>\n<p>\u8bbe\u7f6e\u662f\u5426\u53ef\u5199\uff1afile.setWritable(false) false\u4e0d\u53ef\u5199\uff0ctrue\u53ef\u5199<\/p>\n<p>\u83b7\u53d6\u662f\u5426\u662f\u53ef\u5199\uff1afile.canWrite()<\/p>\n<p>\u662f\u5426\u662f\u9690\u85cf\u6587\u4ef6\uff1afile.isHidden()<\/p>\n<p>\u5224\u65ad\u662f\u5426\u662f\u6587\u4ef6\uff1afile.isFile()<\/p>\n<p>\u5224\u65ad\u662f\u5426\u662f\u6587\u4ef6\u5939\uff08\u76ee\u5f55\uff09\uff1afile.isDirectory()<\/p>\n<p>\u521b\u5efa\u6587\u4ef6\u5939\uff1afile.mkdirs()<\/p>\n<p>\u5220\u9664\u6587\u4ef6\u5939\uff1afile.delete()<\/p>\n<p>\u83b7\u53d6\u5230\u6587\u4ef6\u5939\u4e0b\u9762\u7684\u6240\u6709\u7684\u6587\u4ef6\uff1afile.listFiles()    File[]<\/p>\n<pre><code class=\"language-Java\">        File[] files = file.listFiles();\n        for(File f : files) {\n            if(f.isFile()) {\n                System.out.print(&quot;\u6587\u4ef6\uff1a&quot;);\n            }else {\n                System.out.print(&quot;\u76ee\u5f55\uff1a&quot;);\n            }\n            System.out.println(f.getName());\n        }<\/code><\/pre>\n<h2>IO\u6d41<\/h2>\n<table>\n<thead>\n<tr>\n<th>IO\u6d41<\/th>\n<th><\/th>\n<th>-- \u5b57\u8282\u6d41\uff08\u9002\u5408\u64cd\u4f5c\u4e8c\u8fdb\u5236\u6570\u636e\uff09<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><\/td>\n<td>-- InputStream\uff08\u8f93\u5165\u6d41\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td>-- FileInputStream\uff08\u6587\u4ef6\u8f93\u5165\u6d41\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<td>-- BufferedInputStream\uff08\u7f13\u51b2\u8f93\u5165\u6d41\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td><\/td>\n<td>-- DataInputStream\uff08\u6570\u636e\u8f93\u5165\u6d41\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td>-- ObjectInputStream\uff08\u5bf9\u8c61\u8f93\u5165\u6d41\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td>-- ... ...<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>-- OutputStream\uff08\u8f93\u51fa\u6d41\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>-- FiltOutputStream\uff08\u6587\u4ef6\u8f93\u51fa\u6d41\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>-- FilterOutputStream\uff08\u8fc7\u6ee4\u8f93\u51fa\u6d41\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td>-- BufferedOutputStream\uff08\u7f13\u51b2\u8f93\u5165\u6d41\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td>-- DataOutputStream\uff08\u6570\u636e\u8f93\u51fa\u6d41\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table>\n<thead>\n<tr>\n<th><\/th>\n<th><\/th>\n<th>-- PrintStream\uff08\u6253\u5370\u6d41\uff09<\/th>\n<th><\/th>\n<th>-- ObjectOutputStream\uff08\u5bf9\u8c61\u8f93\u51fa\u6d41\uff09<\/th>\n<th><\/th>\n<th>-- ... ...<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>-- \u5b57\u7b26\u6d41\uff08\u9002\u5408\u64cd\u4f5c\u6587\u672c\u6570\u636e\uff09<\/td>\n<\/tr>\n<tr>\n<\/tr>\n<tr>\n<td>-- Reader\uff08\u8bfb\u53d6\u6d41\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>-- InputStreamReader\uff08\u8f93\u5165\u6d41\u8bfb\u53d6\u5668\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td><\/td>\n<td>-- FileReader\uff08\u6587\u4ef6\u8bfb\u53d6\u5668\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>-- BufferedReader\uff08\u7f13\u51b2\u8bfb\u53d6\u5668\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>-- ... ...<\/td>\n<\/tr>\n<tr>\n<\/tr>\n<tr>\n<td>-- Writer\uff08\u5199\u5165\u6d41\uff09<\/td>\n<\/tr>\n<tr>\n<\/tr>\n<tr>\n<td>-- OutputStreamWriter\uff08\u8f93\u51fa\u6d41\u5199\u5165\u5668\uff09<\/td>\n<\/tr>\n<tr>\n<td><\/td>\n<td>-- FileWriter\uff08\u6587\u4ef6\u5199\u5165\u5668\uff09<\/td>\n<\/tr>\n<tr>\n<td>-- BufferedWriter\uff08\u7f13\u51b2\u5199\u5165\u5668\uff09<\/td>\n<\/tr>\n<tr>\n<td>-- PrintWriter\uff08\u6253\u5370\u5199\u5165\u5668\uff09<\/td>\n<\/tr>\n<tr>\n<td>-- ... ...<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='E:\\\u73ed\u7ea7\\2162\\21103\\\u5c0fQ\u622a\u56fe-20220321142750.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"E:\\\u73ed\u7ea7\\2162\\21103\\\u5c0fQ\u622a\u56fe-20220321142750.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5c0fQ\u622a\u56fe-20220321142750\" \/><\/div><\/p>\n<p>FileOutputStream\uff1a\u6587\u4ef6\u8f93\u51fa\u6d41\uff0c\u5411\u6587\u4ef6\u4e2d\u5199\u5165\u6570\u636e<\/p>\n<p>FileOutputStream fos = new FileOutputStream(&quot;f1.txt&quot;, true);<\/p>\n<p>FileOutputStream\u6784\u9020\u5668\u53c2\u6570\uff1a\u53c2\u65701\uff1a\u6587\u4ef6\u540d\uff0c\u53c2\u65702\uff1a\u662f\u5426\u8ffd\u52a0\uff08\u9ed8\u8ba4\u4e0d\u8ffd\u52a0\uff0ctrue\u8ffd\u52a0\uff09<\/p>\n<p>fos.write()\uff1a\u5411\u6587\u4ef6\u4e2d\u5199\u5165\u6570\u636e<\/p>\n<p>\u5b57\u7b26\u4e32.getBytes(\u7f16\u7801)\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u6307\u5b9a\u7f16\u7801\u683c\u5f0f\u7684\u5b57\u8282\u6570\u7ec4<\/p>\n<pre><code class=\"language-Java\">        FileOutputStream fos = new FileOutputStream(&quot;f1.txt&quot;, true);\n        \/\/ write()\uff1a\u5411\u6587\u4ef6\u4e2d\u5199\u5165\u6570\u636e\n        fos.write(97);\n        fos.write(98);\n        fos.write(99);\n        fos.write(100);\n        fos.write(&#039;\\n&#039;);\n        byte[] bs = { 65, 66, 67, 68, 69 };\n\/\/      fos.write(bs);\n        fos.write(bs, 1, 3);\n        fos.write(&#039;\\n&#039;);\n\n        \/\/ \u5b57\u7b26\u4e32.getBytes(\u7f16\u7801)\uff1a\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u6307\u5b9a\u7f16\u7801\u683c\u5f0f\u7684\u5b57\u8282\u6570\u7ec4\n        fos.write(&quot;Hello World&quot;.getBytes(&quot;UTF-8&quot;));\n        fos.write(&quot;Hello Java&quot;.getBytes(&quot;UTF-8&quot;));\n        fos.close();<\/code><\/pre>\n<p>FileInputStream\uff1a\u6587\u4ef6\u8f93\u5165\u6d41\uff0c\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e<\/p>\n<p>FileInputStream fis = new FileInputStream(&quot;f1.txt&quot;);<\/p>\n<p>fis.read(byte\u6570\u7ec4)\uff1a\u5c06\u6570\u636e\u8bfb\u53d6\u5230byte\u6570\u7ec4\u4e2d<\/p>\n<p>\u5c06byte\u6570\u7ec4\u8f6c\u5b57\u7b26\u4e32\uff1anew String(byte\u6570\u7ec4\uff0c\u5f00\u59cb\u4f4d\u7f6e\uff0c\u957f\u5ea6\uff0c\u7f16\u7801\u683c\u5f0f)\uff1b<\/p>\n<pre><code class=\"language-Java\">        FileInputStream fis = new FileInputStream(&quot;f1.txt&quot;);\n        byte[] bs = new byte[10240];\/\/ \u6bcf\u6b21\u6700\u591a\u80fd\u591f\u8bfb\u53d6\u7684\u957f\u5ea6\n        int len;\/\/ \u771f\u5b9e\u7684\u957f\u5ea6\n        String str = &quot;&quot;;\n        while ((len = fis.read(bs)) &gt; 0) {\n            \/\/ \u5c06byte\u6570\u7ec4\u8f6c\u5b57\u7b26\u4e32\uff1anew String(bs\uff0c\u5f00\u59cb\u4f4d\u7f6e\uff0c\u957f\u5ea6\uff0c\u7f16\u7801\u683c\u5f0f)\n            str += new String(bs, 0, len, &quot;UTF-8&quot;);\n        }\n        fis.close();\n        System.out.println(str);<\/code><\/pre>\n<p>\u62f7\u8d1d\uff1a<\/p>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0321;\n\nimport java.io.File;\nimport java.io.FileInputStream;\nimport java.io.FileOutputStream;\nimport java.io.IOException;\nimport java.util.Scanner;\n\npublic class CopyTest {\n\n    public static void main(String[] args) throws IOException {\n        Scanner sc = new Scanner(System.in);\n        System.out.println(&quot;\u8bf7\u8f93\u5165\u6e90\u6587\u4ef6&quot;);\n        String str = sc.next();\n        System.out.println(&quot;\u8bf7\u8f93\u5165\u76ee\u6807\u6587\u4ef6&quot;);\n        String str2 = sc.next();\n        FileInputStream fis = new FileInputStream(str);\n        FileOutputStream fos = new FileOutputStream(str2);\n        byte[] bs = new byte[10240];\n        int len;\n        while((len=fis.read(bs)) != -1) {\n            fos.write(bs);\n        }\n        fis.close();\n        fos.close();\n        System.out.println(&quot;\u62f7\u8d1d\u6210\u529f\uff01\uff01&quot;);\n\n        File file = new File(str);\n        File file2 = new File(str2);\n        file2.setLastModified(file.lastModified());\n    }\n\n}\n<\/code><\/pre>\n<p>BufferedOutputStream\uff0cBufferedInputStream\uff1a\u7f13\u51b2\u6d41<\/p>\n<p>\u4f4e\u7ea7\u6d41\uff0c\u8282\u70b9\u6d41\uff1a\u76f4\u63a5\u64cd\u4f5c\u786c\u4ef6\u8bbe\u5907\u7684\u6d41\uff0c\u6bd4\u5982FileOutputStream<\/p>\n<p>\u9ad8\u7ea7\u6d41\uff0c\u5904\u7406\u6d41\uff1a\u4e0d\u76f4\u63a5\u64cd\u4f5c\u786c\u4ef6\u8bbe\u5907\uff0c\u9700\u8981\u4f20\u5165\u4e00\u4e2a\u6d41\u6765\u8fdb\u884c\u64cd\u4f5c\uff0c\u5982BufferedOutputStream<\/p>\n<pre><code class=\"language-Java\">BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(&quot;f2.txt&quot;));\nbos.write(&quot;Hello World&quot;.getBytes(&quot;UTF-8&quot;));\nbos.write(&quot;Hello World&quot;.getBytes(&quot;UTF-8&quot;));\nbos.close();<\/code><\/pre>\n<pre><code class=\"language-Java\">BufferedInputStream bis = new BufferedInputStream(new FileInputStream(&quot;f2.txt&quot;));\nbyte[] bs = new byte[10240];\nint len;\nString str = &quot;&quot;;\nwhile ((len = bis.read(bs)) &gt; 0) {\n    str += new String(bs, 0, len, &quot;UTF-8&quot;);\n}\nbis.close();\nSystem.out.println(str);<\/code><\/pre>\n<p>DataOutputStream\uff0cDataInputStream\uff1a\u6570\u636e\u6d41\uff0c\u9ad8\u7ea7\u6d41<\/p>\n<pre><code class=\"language-Java\">public static void main(String[] args) throws IOException {\n\/\/ DataOutputStream\uff0cDataInputStream\uff1a\u6570\u636e\u6d41\uff0c\u9ad8\u7ea7\u6d41\nDataOutputStream dos = new DataOutputStream(new FileOutputStream(&quot;f3.txt&quot;));\ndos.writeInt(100);\ndos.writeUTF(&quot;hello&quot;);\ndos.writeDouble(3.14);\ndos.close();\n\nDataInputStream dis = new DataInputStream(new FileInputStream(&quot;f3.txt&quot;));\nSystem.out.println(dis.readInt());\nSystem.out.println(dis.readUTF());\nSystem.out.println(dis.readDouble());\ndis.close();\n}<\/code><\/pre>\n<p>ObjectOutputStream\uff0cObjectInputStream\uff1a\u5bf9\u8c61\u6d41\uff0c\u9ad8\u7ea7\u6d41<\/p>\n<p>ObjectOutputStream\uff1a\u5c06\u5bf9\u8c61\u8f6c\u6210byte\u6570\u7ec4<\/p>\n<p>ObjectInputStream\uff1a\u5c06byte\u6570\u7ec4\u8f6c\u5bf9\u8c61<\/p>\n<p>\u5e8f\u5217\u5316\uff1a\u5c06\u5bf9\u8c61\u8f6c\u6210byte\u6570\u7ec4\u3001\u5b57\u7b26\u4e32\u7b49<\/p>\n<p>\u53cd\u5e8f\u5217\u5316\uff1a\u5c06byte\u6570\u7ec4\u3001\u5b57\u7b26\u4e32\u7b49\u8f6c\u6210\u5bf9\u8c61<\/p>\n<pre><code class=\"language-Java\">import java.io.Serializable;\n\/\/ \u82e5\u60f3\u8fdb\u884c\u4e8c\u8fdb\u5236\u5e8f\u5217\u5316\uff0c\u5b9e\u73b0Serializable\uff08\u53ef\u5e8f\u5217\u5316\u63a5\u53e3\uff09\npublic class Emp implements Serializable{\n\n    private String name;\n    private double salary;\n\n    public String getName() {\n        return name;\n    }\n\n    public void setName(String name) {\n        this.name = name;\n    }\n\n    public double getSalary() {\n        return salary;\n    }\n\n    public void setSalary(double salary) {\n        this.salary = salary;\n    }\n\n    @Override\n    public String toString() {\n        return &quot;Emp [name=&quot; + name + &quot;, salary=&quot; + salary + &quot;]&quot;;\n    }\n\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">    public static void main(String[] args) throws FileNotFoundException, IOException, ClassNotFoundException {\n        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(&quot;emp.txt&quot;));\n        Emp emp = new Emp();\n        emp.setName(&quot;tom&quot;);\n        emp.setSalary(18000);\n        \/\/ \u5bf9\u8c61\u5199\u5165\u5230\u6d41\u4e2d\uff08\u5e8f\u5217\u5316\u7684\u8fc7\u7a0b\uff09\n        oos.writeObject(emp);\n        oos.close();\n\n        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(&quot;emp.txt&quot;));\n        \/\/ \u6570\u636e\u5199\u5165\u5230\u5bf9\u8c61\uff08\u53cd\u5e8f\u5217\u7684\u8fc7\u7a0b\uff09\n        Emp emp2 = (Emp) ois.readObject();\n        ois.close();\n        System.out.println(emp);\n    }<\/code><\/pre>\n<p>PrintStream \uff1a\u6253\u5370\u6d41<\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) throws FileNotFoundException {\n        \/\/ PrintStream  \u6253\u5370\u6d41\n        \/\/ System.out.println(&quot;Hello&quot;);\n        PrintStream ps = new PrintStream(&quot;p.txt&quot;);\n        ps.print(&quot;hello&quot;);\n        ps.close();\n\n        \/\/ \u8f93\u51fa\u5728\u63a7\u5236\u53f0\n\/\/      PrintStream ps = new PrintStream(System.out);\n\/\/      ps.print(&quot;Hello&quot;);\n\/\/      ps.close();\n    }<\/code><\/pre>\n<p><strong>\u5b57\u7b26\u6d41<\/strong><\/p>\n<p>FileWriter,FileReader\uff0c\u6587\u4ef6\u8bfb\u5199\uff0c\u4f4e\u7ea7\u6d41\uff08\u8282\u70b9\u6d41\uff09<\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) throws IOException {\n        \/\/ FileWriter,FileReader\n        FileWriter fw = new FileWriter(&quot;w1.txt&quot;);\n        fw.write(97);\n        fw.write(98);\n        fw.write(99);\n        char[] cs = { &#039;\u4f60&#039;, &#039;\u597d&#039;, &#039;\u4f60&#039;, &#039;\u662f&#039;, &#039;\u5c0f&#039;, &#039;\u4e11&#039;, &#039;!&#039; };\n        fw.write(cs);\n        fw.write(cs, 0, 2);\n        fw.write(&quot;helloworld&quot;, 2, 3);\n        fw.write(&quot;\u9ad8\u65af\u6797\\n&quot;);\n        fw.write(&quot;\u57c3\u91cc\u68ee&quot;);\n        fw.close();\n\n        FileReader reader = new FileReader(&quot;w1.txt&quot;);\n        char[] c = new char[10240];\n        int len;\n        String str = &quot;&quot;;\n        while ((len = reader.read(c)) != -1) {\n            str += new String(c, 0, len);\n        }\n        reader.close();\n        System.out.println(str);\n    }<\/code><\/pre>\n<p>BufferedWriter, BufferedReader \u7f13\u51b2\u8bfb\u5199\u6d41\uff0c\u9ad8\u7ea7\u6d41<\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) throws IOException {\n        BufferedWriter writer = new BufferedWriter(new FileWriter(&quot;w2.txt&quot;));\n        writer.write(&quot;\u9ad8\u65af\u6797&quot;);\n        writer.close();\n\n        BufferedReader reader = new BufferedReader(new FileReader(&quot;w2.txt&quot;));\n        char[] cs = new char[10240];\n        int len;\n        String str = &quot;&quot;;\n        while ((len = reader.read(cs)) &gt; 0) {\n            str = new String(cs, 0, len);\n        }\n        reader.close();\n        System.out.println(str);\n    }<\/code><\/pre>\n<pre><code class=\"language-Java\">    public static void main(String[] args) throws IOException {\n        OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(&quot;w3.txt&quot;),&quot;UTF-8&quot;);\n        writer.write(&quot;\u9ad8\u65af\u6797&quot;);\n        writer.close();\n\n        InputStreamReader reader = new InputStreamReader(new FileInputStream(&quot;w3.txt&quot;),&quot;UTF-8&quot;);\n        char[] cs = new char[10240];\n        int len;\n        String str = &quot;&quot;;\n        while ((len = reader.read(cs)) &gt; 0) {\n            str = new String(cs, 0, len);\n        }\n        reader.close();\n        System.out.println(str);\n    }\n<\/code><\/pre>\n<p>PrintWriter \u6253\u5370\u5199\u5165\u5668<\/p>\n<pre><code class=\"language-Java\">    public static void main(String[] args) throws FileNotFoundException {\n        \/\/ PrintWriter \u6253\u5370\u5199\u5165\u5668\n        PrintWriter out = new PrintWriter(&quot;p2.txt&quot;);\n        out.println(100);\n        out.println(&quot;Hello World&quot;);\n        out.close();\n\n\/\/      Scanner sc = new Scanner(new File(&quot;p2.txt&quot;));\n\/\/      System.out.println(sc.nextInt());\n\/\/      sc.nextLine();\n\/\/      System.out.println(sc.nextLine());\n\n        Scanner sc = new Scanner(new File(&quot;p2.txt&quot;));\n        System.out.println(Integer.parseInt(sc.nextLine()));\n        System.out.println(sc.nextLine());\n    }<\/code><\/pre>\n<h2>\u591a\u7ebf\u7a0b<\/h2>\n<p>\u5e76\u53d1\uff1a\u6307\u4e24\u4e2a\u6216\u591a\u4e2a\u4e8b\u4ef6\u5728\u540c\u4e00\u4e2a\u65f6\u95f4\u6bb5\u5185\u53d1\u751f<\/p>\n<p>\u5e76\u884c\uff1a\u6307\u4e24\u4e2a\u6216\u591a\u4e2a\u4e8b\u4ef6\u5728\u540c\u4e00\u65f6\u523b\uff08\u540c\u65f6\u53d1\u751f\uff09<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='C:\\Users\\LQ\\AppData\\Roaming\\Typora\\typora-user-images\\1648012176388.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"C:\\Users\\LQ\\AppData\\Roaming\\Typora\\typora-user-images\\1648012176388.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"1648012176388\" \/><\/div><\/p>\n<p><strong>\u8fdb\u7a0b<\/strong><\/p>\n<p>\u8fdb\u7a0b\uff1a\u662f\u6307\u4e00\u4e2a\u5185\u5b58\u4e2d\u8fd0\u884c\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u6bcf\u4e2a\u8fdb\u7a0b\u90fd\u6709\u4e00\u4e2a\u72ec\u7acb\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u4e00\u4e2a\u5e94\u7528<br \/>\n\u7a0b\u5e8f\u53ef\u4ee5\u540c\u65f6\u8fd0\u884c\u591a \u4e2a\u8fdb\u7a0b\uff1b\u8fdb\u7a0b\u4e5f\u662f\u7a0b\u5e8f\u7684\u4e00\u6b21\u6267\u884c\u8fc7\u7a0b\uff0c\u662f\u7cfb\u7edf\u8fd0\u884c\u7a0b\u5e8f\u7684\u57fa\u672c\u5355<br \/>\n\u4f4d\uff1b\u7cfb\u7edf\u8fd0\u884c\u4e00\u4e2a\u7a0b\u5e8f\u5373\u662f\u4e00\u4e2a\u8fdb\u7a0b\u4ece\u521b \u5efa\u3001\u8fd0\u884c\u5230\u6d88\u4ea1\u7684\u8fc7\u7a0b\u3002<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='C:\\Users\\LQ\\AppData\\Roaming\\Typora\\typora-user-images\\1648012266965.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"C:\\Users\\LQ\\AppData\\Roaming\\Typora\\typora-user-images\\1648012266965.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"1648012266965\" \/><\/div><\/p>\n<p><strong>\u7ebf\u7a0b<\/strong>\uff1a\u7ebf\u7a0b\u662f\u8fdb\u7a0b\u4e2d\u7684\u4e00\u4e2a\u6267\u884c\u5355\u5143\uff0c\u8d1f\u8d23\u5f53\u524d\u8fdb\u7a0b\u4e2d\u7a0b\u5e8f\u7684\u6267\u884c\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\u81f3\u5c11\u6709\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\u662f\u53ef\u4ee5\u6709\u591a\u4e2a\u7ebf\u7a0b\u7684\uff0c\u8fd9\u4e2a\u5e94\u7528\u7a0b\u5e8f\u4e5f\u53ef\u4ee5\u79f0\u4e4b\u4e3a\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u3002<\/p>\n<p>\u7b80\u800c\u8a00\u4e4b\uff1a\u4e00\u4e2a\u7a0b\u5e8f\u8fd0\u884c\u540e\u81f3\u5c11\u6709\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u7ebf\u7a0b<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='C:\\Users\\LQ\\AppData\\Roaming\\Typora\\typora-user-images\\1648012534116.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"C:\\Users\\LQ\\AppData\\Roaming\\Typora\\typora-user-images\\1648012534116.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"1648012534116\" \/><\/div><\/p>\n<p><strong>\u7ebf\u7a0b\u8c03\u5ea6\uff1a<\/strong><\/p>\n<p>1.\u5206\u65f6\u8c03\u5ea6\uff1a\u6240\u6709\u7ebf\u7a0b\u8f6e\u6d41\u4f7f\u7528CPU\u7684\u4f7f\u7528\u6743\uff0c\u5e73\u5747\u5206\u914d\u6bcf\u4e2a\u7ebf\u7a0b\u5360\u7528CPU\u4e8b\u4ef6<\/p>\n<p>2.\u62a2\u5360\u5f0f\u8c03\u7528\uff1a\u4f18\u5148\u8ba9\u4f18\u5148\u7ea7\u9ad8\u7684\u7ebf\u7a0b\u4f7f\u7528CPU\uff0c\u5982\u679c\u7ebf\u7a0b\u4f18\u5148\u7ea7\u76f8\u540c\uff0c\u90a3\u4e48\u4f1a\u968f\u673a\u9009\u62e9\u4e00\u4e2a\uff08\u7ebf\u7a0b\u968f\u673a\u6027\uff09\uff0cJava\u4f7f\u7528\u7684\u4e3a\u62a2\u5360\u5f0f\u8c03\u5ea6<\/p>\n<p><strong>\u4e3b\u7ebf\u7a0b\uff1a<\/strong>\u6267\u884c\u4e3b\uff08main\uff09\u65b9\u6cd5\u7684\u7ebf\u7a0b<\/p>\n<p>\u5355\u7ebf\u7a0b\u7a0b\u5e8f\uff1ajava\u7a0b\u5e8f\u4e2d\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='C:\\Users\\LQ\\AppData\\Roaming\\Typora\\typora-user-images\\1648012862338.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"C:\\Users\\LQ\\AppData\\Roaming\\Typora\\typora-user-images\\1648012862338.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"1648012862338\" \/><\/div><\/p>\n<p><strong>\u5b9e\u73b0\u7ebf\u7a0b\u4e24\u79cd\u65b9\u5f0f<\/strong><\/p>\n<p><strong>\u65b9\u5f0f\u4e00\uff1a<\/strong><\/p>\n<p>1.\u7ee7\u627fThread\u7c7b<\/p>\n<p>2.\u91cd\u5199run\u65b9\u6cd5\uff0c\u8bbe\u7f6e\u7ebf\u7a0b\u7684\u4efb\u52a1<\/p>\n<p>3.\u521b\u5efaThread\u7c7b\u7684\u5b50\u7c7b\u5bf9\u8c61<\/p>\n<p>4.\u8c03\u7528Thread\u7c7b\u4e2d\u7684start\u65b9\u6cd5\uff0c\u5f00\u542f\u65b0\u7684\u7ebf\u7a0b\uff0c\u6267\u884crun\u65b9\u6cd5<\/p>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0323.p2;\n\/*\n * Thread java.lang.Thread\u7c7b\uff1a\u662f\u63cf\u8ff0\u7ebf\u7a0b\u7684\u7c7b\uff0c\n *  \u6211\u4eec\u60f3\u8981\u5b9e\u73b0\u591a\u7ebf\u7a0b\u7a0b\u5e8f\uff0c\u5c31\u9700\u8981\u7ee7\u627fThread\u7c7b\n *\/\n\/\/ 1.\u521b\u5efa\u4e00\u4e2aThread\u7c7b\u7684\u5b50\u7c7b\npublic class MyThread extends Thread {\n    \/\/ 2.\u5728Thread\u7c7b\u7684\u5b50\u7c7b\u4e2d\u91cd\u5199Thread\u7c7b\u4e2d\u7684run\u65b9\u6cd5\uff0c\u8bbe\u7f6e\u7ebf\u7a0b\u8ba4\u4e3a\uff08\u5f00\u542f\u7ebf\u7a0b\u8981\u505a\u4ec0\u4e48\uff09\n    @Override\n    public void run() {\n        for (int i = 0; i &lt; 20; i++) {\n            System.out.println(&quot;run:&quot; + i);\n        }\n    }\n}\n<\/code><\/pre>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0323.p2;\n\n\/*\n * 1.\u521b\u5efa\u4e00\u4e2aThread\u7c7b\u7684\u5b50\u7c7b\n * 2.\u5728Thread\u7c7b\u7684\u5b50\u7c7b\u4e2d\u91cd\u5199Thread\u7c7b\u4e2d\u7684run\u65b9\u6cd5\uff0c\u8bbe\u7f6e\u7ebf\u7a0b\u4efb\u52a1\uff08\u5f00\u542f\u7ebf\u7a0b\u60f3\u8981\u505a\u4ec0\u4e48\uff1f\uff09\n * 3.\u521b\u5efaThread\u7c7b\u7684\u5b50\u7c7b\u5bf9\u8c61\n * 4.\u8c03\u7528Thread\u7c7b\u4e2d\u7684\u65b9\u6cd5start\u65b9\u6cd5\uff0c\u5f00\u542f\u65b0\u7ebf\u7a0b\uff0c\u6267\u884crun\u65b9\u6cd5\n *   void start():\u4f7f\u8be5\u7ebf\u7a0b\u5f00\u59cb\u6267\u884c\uff1bJava\u865a\u62df\u673a\u8c03\u7528\u8be5\u7ebf\u7a0b\u7684run\u65b9\u6cd5\n *  \u591a\u6b21\u542f\u52a8\u4e00\u4e2a\u7ebf\u7a0b\u662f\u975e\u6cd5\u7684\u3002\n * \n * Java\u7a0b\u5e8f\u5c5e\u4e8e\u62a2\u5360\u5f0f\u8c03\u5ea6\uff0c\u54ea\u4e2a\u7ebf\u7a0b\u7684\u4f18\u5148\u7ea7\u9ad8\uff0c\u54ea\u4e2a\u7ebf\u7a0b\u4f18\u5148\u6267\u884c\uff0c\u540c\u4e00\u4e2a\u4f18\u5148\u7ea7\uff0c\u968f\u673a\u9009\u62e9\u4e00\u4e2a\u6267\u884c\n *  \n *\/\npublic class Thread01 {\n\n    public static void main(String[] args) {\n        \/\/ 3.\u521b\u5efaThread\u7c7b\u7684\u5b50\u7c7b\u5bf9\u8c61\n        MyThread mt = new MyThread();\n        mt.start();\n\n        for (int i = 0; i &lt; 20; i++) {\n            System.out.println(&quot;main:&quot; + i);\n        }\n    }\n\n}\n<\/code><\/pre>\n<p><strong>\u65b9\u5f0f\u4e8c\uff1a<\/strong><\/p>\n<p>1.\u5b9e\u73b0Runnable\u63a5\u53e3<\/p>\n<p>2.\u91cd\u5199run\u65b9\u6cd5<\/p>\n<p>3.\u521b\u5efa\u4e00\u4e2aRunnable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u5bf9\u8c61<\/p>\n<p>4.\u521b\u5efaThread\u7c7b\u5bf9\u8c61\uff0c\u6784\u9020\u65b9\u6cd5\u4e2d\u4f20\u9012Runnable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u5bf9\u8c61<\/p>\n<p>5.\u8c03\u7528Thread\u7c7b\u4e2d\u7684start()\u65b9\u6cd5\uff0c\u5f00\u542f\u65b0\u7684\u7ebf\u7a0b<\/p>\n<pre><code class=\"language-Java\">\/\/ 1.\u521b\u5efa\u4e00\u4e2aRunnable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\npublic class RunnableImpl implements Runnable {\n    \/\/ 2.\u5728\u5b9e\u73b0\u7c7b\u4e2d\u91cd\u5199Runnable\u63a5\u53e3\u7684run\u65b9\u6cd5\uff0c\u8bbe\u7f6e\u7ebf\u7a0b\u4efb\u52a1\n    @Override\n    public void run() {\n        for (int i = 0; i &lt; 20; i++) {\n            System.out.println(Thread.currentThread().getName() + &quot;--&gt;&quot; + i);\n        }\n    }\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">public class RunnableImplTest {\n\n    public static void main(String[] args) {\n        \/\/ 3.\u521b\u5efa\u4e00\u4e2aRunnable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u5bf9\u8c61\n        RunnableImpl run = new RunnableImpl();\n\n        \/\/ 4.\u521b\u5efaThread\u7c7b\u5bf9\u8c61\uff0c\u6784\u9020\u65b9\u6cd5\u4e2d\u4f20\u9012Runnable\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u5bf9\u8c61\n        \/\/ Thread t = new Thread(run);\n        \/\/ 5.\u8c03\u7528Thread\u7c7b\u4e2d\u7684start()\u65b9\u6cd5\uff0c\u5f00\u542f\u65b0\u7684\u7ebf\u7a0b\n        \/\/ t.start();\n        \/\/ \u6b65\u9aa44\u548c5\u5408\u5e76\n        new Thread(run).start();\n\n        for (int i = 0; i &lt; 20; i++) {\n            System.out.println(Thread.currentThread().getName() + &quot;--&gt;&quot; + i);\n        }\n    }\n\n}<\/code><\/pre>\n<p>\u7b2c\u4e00\u79cd\u65b9\u5f0f\uff0c\u4f7f\u7528\u7b80\u5355\uff0c\u4f46\u662f\u5f71\u54cd\u5b50\u7c7b\u7ee7\u627f\u5176\u4ed6\u7c7b<\/p>\n<p>\u7b2c\u4e8c\u79cd\u65b9\u5f0f\uff0c\u4e0d\u5f71\u54cd\u7ee7\u627f\uff0c\u8fd8\u53ef\u4ee5\u5171\u4eab\u5b9e\u73b0\u7c7b\u8d44\u6e90<\/p>\n<p><strong>\u533f\u540d\u5185\u90e8\u7c7b\u65b9\u5f0f\u5b9e\u73b0\u591a\u7ebf\u7a0b\u7684\u521b\u5efa\uff0c\u7b80\u5316\u4ee3\u7801<\/strong><\/p>\n<pre><code class=\"language-Java\">public class InnerClassThread {\n\n    public static void main(String[] args) {\n        \/\/ \u7ebf\u7a0b\u7684\u7236\u7c7b\u662fThread\n        new Thread() {\n            @Override\n            public void run() {\n                for (int i = 0; i &lt; 20; i++) {\n                    System.out.println(Thread.currentThread().getName() + &quot; hello tom&quot;);\n                }\n            }\n        }.start();\n\n        \/\/ \u7ebf\u7a0b\u7684\u63a5\u53e3\u662fRunnable\n        Runnable run = new Runnable() {\n\n            @Override\n            public void run() {\n                for (int i = 0; i &lt; 20; i++) {\n                    System.out.println(Thread.currentThread().getName() + &quot; hello amy&quot;);\n                }\n            }\n        };\n        new Thread(run).start();\n\n        \/\/ \u7b80\u5316\u63a5\u53e3\u7684\u65b9\u6cd5\n        new Thread(new Runnable() {\n\n            @Override\n            public void run() {\n                for (int i = 0; i &lt; 20; i++) {\n                    System.out.println(Thread.currentThread().getName() + &quot; hello john&quot;);\n                }\n            }\n        }).start();\n    }\n\n}<\/code><\/pre>\n<p><strong>\u83b7\u53d6\u7ebf\u7a0b\u540d\u79f0\uff1a<\/strong><\/p>\n<p>1.\u4f7f\u7528Thread\u7c7b\u4e2d\u7684\u65b9\u6cd5getName()\uff0c\u8fd4\u56de\u7ebf\u7a0b\u7684\u540d\u79f0<\/p>\n<pre><code class=\"language-Java\">public class MyThread_getName extends Thread{\n    @Override\n    public void run() {\n        \/\/ \u2460\n        String name = getName();\n        System.out.println(name);\n    }\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        \/*\n         * \u7ebf\u7a0b\u7684\u540d\u79f0\uff1aThread-0,Thread-1,Thread-2\n         *\/\n        MyThread_getName mt = new MyThread_getName();\n        mt.start();\n\n        new MyThread_getName().start();\n        new MyThread_getName().start();\n\n    }<\/code><\/pre>\n<p>2.\u53ef\u4ee5\u5148\u83b7\u53d6\u5230\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u7ebf\u7a0b\uff0c\u4f7f\u7528\u7ebf\u7a0b\u4e2d\u7684\u65b9\u6cd5getName()\u83b7\u53d6\u7ebf\u7a0b\u7684\u540d\u79f0<\/p>\n<p>Thread.currentThread()\u8fd4\u56de\u6b63\u5728\u6267\u884c\u7684\u7ebf\u7a0b\u5bf9\u8c61<\/p>\n<pre><code class=\"language-Java\">public class MyThread_getName extends Thread{\n\n    @Override\n    public void run() {\n\n        \/\/ \u2461\n\/\/      Thread t = Thread.currentThread();\n\/\/      System.out.println(t);\n\/\/      String name = t.getName();\n\/\/      System.out.println(name);\n        \/\/ \u2462\uff1a\u5c06\u2461\u5408\u5e76\n        System.out.println(Thread.currentThread().getName());\n    }\n\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        \/*\n         * \u7ebf\u7a0b\u7684\u540d\u79f0\uff1aThread-0,Thread-1,Thread-2\n         *\/\n        MyThread_getName mt = new MyThread_getName();\n        mt.start();\n\n        new MyThread_getName().start();\n        new MyThread_getName().start();\n        \/\/ \u83b7\u53d6\u4e3b\u7ebf\u7a0b\u540d\u79f0\n        System.out.println(Thread.currentThread().getName());\n    }<\/code><\/pre>\n<p><strong>\u8bbe\u7f6e\u7ebf\u7a0b\u540d\u79f0\uff1a<\/strong><\/p>\n<p>1.setName();<\/p>\n<pre><code class=\"language-Java\">public class MyThread_setName extends Thread {\n\n    @Override\n    public void run() {\n        \/\/ \u83b7\u53d6\u7ebf\u7a0b\u540d\u79f0\u5e76\u8f93\u51fa\n        System.out.println(Thread.currentThread().getName());\n    }\n\n}\n<\/code><\/pre>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n\n        MyThread_setName mt = new MyThread_setName();\n        \/\/ \u2460\u8bbe\u7f6e\u7ebf\u7a0b\u540d\u79f0\n        mt.setName(&quot;\u5c0f\u5f3a&quot;);\n        mt.start();\n\n    }<\/code><\/pre>\n<p>2.\u6709\u53c2\u6784\u9020\u65b9\u6cd5<\/p>\n<pre><code class=\"language-Java\">public class MyThread_setName extends Thread {\n\n    public MyThread_setName() {\n    }\n\n    public MyThread_setName(String name) {\n        super(name);\n    }\n\n    @Override\n    public void run() {\n        System.out.println(Thread.currentThread().getName());\n    }\n\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">    public static void main(String[] args) {\n        MyThread_setName mt = new MyThread_setName(&quot;\u65fa\u8d22&quot;);\n        mt.start();\n    }<\/code><\/pre>\n<p>sleep\uff1a\u8ba9\u7a0b\u5e8f\u7761\u7720<\/p>\n<pre><code class=\"language-Java\">public class MyThread_sleep {\n    \/*\n     *  public static void sleep(long millis);\n     *  \u4f7f\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u7a0b\u5e8f\u4ee5\u6307\u5b9a\u7684\u6beb\u79d2\u6570\u6682\u505c\uff08\u6682\u65f6\u505c\u6b62\u6267\u884c\uff09\n     *  \u6beb\u79d2\u6570\u7ed3\u675f\u540e\uff0c\u7ebf\u7a0b\u7ee7\u7eed\u6267\u884c\n     *\/\n    public static void main(String[] args) {\n        \/\/ \u6a21\u62df\u79d2\u8868\n        for (int i = 1; i &lt;= 60; i++) {\n            System.out.println(i);\n            try {\n                \/\/ Thread\u7c7b\u7684sleep\u65b9\u6cd5\u8ba9\u7a0b\u5e8f\u7761\u77201\u79d2\u949f\n                Thread.sleep(1000);\n            } catch (InterruptedException e) {\n                \/\/ TODO Auto-generated catch block\n                e.printStackTrace();\n            }\n        }\n    }\n\n}<\/code><\/pre>\n<p><strong>\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898<\/strong><\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='C:\\Users\\LQ\\AppData\\Roaming\\Typora\\typora-user-images\\1648090795239.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"C:\\Users\\LQ\\AppData\\Roaming\\Typora\\typora-user-images\\1648090795239.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"1648090795239\" \/><\/div><\/p>\n<p><strong>\u89e3\u51b3\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898<\/strong><\/p>\n<p>1.\u4f7f\u7528\u540c\u6b65\u4ee3\u7801\u5757\u89e3\u51b3<\/p>\n<p>\u683c\u5f0fsynchronized(\u9501\u5bf9\u8c61){<\/p>\n<p>\u200b   \u53ef\u80fd\u4f1a\u51fa\u73b0\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u7684\u4ee3\u7801\uff08\u8bbf\u95ee\u4e86\u5171\u4eab\u6570\u636e\u7684\u4ee3\u7801\uff09<\/p>\n<p>}<\/p>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0324;\n\n\/*\n * \u5356\u7968\u6848\u4f8b\u51fa\u73b0\u4e86\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\uff0c\u5356\u51fa\u4e86\u4e0d\u5b58\u5728\u7684\u7968\u548c\u91cd\u590d\u7684\u7968\n * \n * \u89e3\u51b3\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u7684\u7b2c\u4e00\u79cd\u65b9\u6848\uff1a\u4f7f\u7528\u540c\u6b65\u4ee3\u7801\u5757\n * \u683c\u5f0f\uff1a\n * synchronized(\u9501\u5bf9\u8c61){\n *  \u53ef\u80fd\u4f1a\u51fa\u73b0\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u7684\u4ee3\u7801\uff08\u8bbf\u95ee\u4e86\u5171\u4eab\u6570\u636e\u7684\u4ee3\u7801\uff09\n * }\n * \u6ce8\u610f\uff1a1.\u901a\u8fc7\u4ee3\u7801\u5757\u4e2d\u7684\u9501\u5bf9\u8c61\uff0c\u53ef\u4ee5\u4f7f\u7528\u4efb\u610f\u7684\u5bf9\u8c61\n *   2.\u4f46\u662f\u5fc5\u987b\u4fdd\u8bc1\u591a\u4e2a\u7ebf\u7a0b\u4f7f\u7528\u7684\u9501\u5bf9\u8c61\u662f\u540c\u4e00\u4e2a\n *   3.\u9501\u5bf9\u8c61\u4f5c\u7528\uff1a\u628a\u540c\u6b65\u4ee3\u7801\u5757\u9501\u4f4f\uff0c\u53ea\u8ba9\u4e00\u4e2a\u7ebf\u7a0b\u5728\u540c\u6b65\u4ee3\u7801\u5757\u4e2d\u6267\u884c\n * \n *\/\npublic class TicketThread implements Runnable {\n\n    private int ticket = 100;\n\n    \/\/ \u521b\u5efa\u4e00\u4e2a\u9501\u5bf9\u8c61\n    Object obj = new Object();\n\n    \/\/ \u8bbe\u7f6e\u7ebf\u7a0b\u4efb\u52a1\uff1a\u5356\u7968\n    @Override\n    public void run() {\n        \/\/ \u4f7f\u7528\u6b7b\u5faa\u73af\uff0c\u8ba9\u5356\u7968\u64cd\u4f5c\u91cd\u590d\u6267\u884c\n        while (true) {\n            synchronized (obj) {\n                \/\/ \u5148\u5224\u65ad\u7968\u662f\u5426\u5b58\u5728\n                if (ticket &gt; 0) {\n                    \/\/ \u7968\u5b58\u5728\uff0c\u5356\u7968\uff0cticket--\n                    System.out.println(Thread.currentThread().getName() + &quot;--&gt;\u6b63\u5728\u5356\u7b2c&quot; + ticket + &quot;\u5f20\u7968&quot;);\n                    ticket--;\n                }\n            }\n        }\n    }\n\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0324;\n\npublic class TicketThreadTest {\n\n    public static void main(String[] args) {\n        TicketThread t = new TicketThread();\n        Thread t0 = new Thread(t);\n        Thread t1 = new Thread(t);\n        Thread t2 = new Thread(t);\n        t0.start();\n        t1.start();\n        t2.start();\n    }\n\n}<\/code><\/pre>\n<p>2.\u4f7f\u7528\u540c\u6b65\u65b9\u6cd5\u89e3\u51b3<\/p>\n<p>\u683c\u5f0f\uff1a<\/p>\n<p>\u8bbf\u95ee\u4fee\u9970\u7b26 synchronized \u8fd4\u56de\u503c\u7c7b\u578b \u65b9\u6cd5\u540d(\u53c2\u6570\u5217\u8868){<\/p>\n<p>\u200b   \u53ef\u80fd\u4f1a\u51fa\u73b0\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u7684\u4ee3\u7801\uff08\u8bbf\u95ee\u4e86\u5171\u4eab\u6570\u636e\u7684\u4ee3\u7801\uff09<\/p>\n<p>}<\/p>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325;\n\/*\n * \u89e3\u51b3\u7ebf\u7a0b\u5b89\u5168\u7684\u7b2c\u4e8c\u79cd\u65b9\u6848\uff1a\u4f7f\u7528\u540c\u6b65\u65b9\u6cd5\n * \u4f7f\u7528\u6b65\u9aa4\uff1a1.\u628a\u8bbf\u95ee\u4e86\u5171\u4eab\u6570\u636e\u7684\u4ee3\u7801\u62bd\u53d6\u51fa\u6765\uff0c\u653e\u5230\u4e00\u4e2a\u65b9\u6cd5\u4e2d\n *      2.\u5728\u65b9\u6cd5\u4e0a\u6dfb\u52a0synchronized\u4fee\u9970\u7b26\n * \n * \u683c\u5f0f\uff1a\n *  \u8bbf\u95ee\u4fee\u9970\u7b26  synchronized \u8fd4\u56de\u503c\u7c7b\u578b \u65b9\u6cd5\u540d(\u53c2\u6570\u5217\u8868){\n *      \u53ef\u80fd\u4f1a\u51fa\u73b0\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u7684\u4ee3\u7801\uff08\u8bbf\u95ee\u4e86\u5171\u4eab\u6570\u636e\u7684\u4ee3\u7801\uff09\n * }\n *\/\npublic class TicketThread implements Runnable {\n\n    private int ticket = 100;\n\n    \/\/ \u8bbe\u7f6e\u7ebf\u7a0b\u4efb\u52a1\uff1a\u5356\u7968\n    @Override\n    public void run() {\n        \/\/ \u4f7f\u7528\u6b7b\u5faa\u73af\uff0c\u8ba9\u5356\u7968\u64cd\u4f5c\u91cd\u590d\u6267\u884c\n        while (true) {\n            payTicket();\n        }\n    }\n    \/*\n     * \u5b9a\u4e49\u4e00\u4e2a\u540c\u6b65\u65b9\u6cd5\uff0c\u540c\u6b65\u65b9\u6cd5\u4e5f\u4f1a\u628a\u65b9\u6cd5\u5185\u90e8\u7684\u4ee3\u7801\u9501\u4f4f\uff0c\u53ea\u8ba9\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\n     * \u540c\u6b65\u65b9\u6cd5\u7684\u9501\u5bf9\u8c61\u662f\u8c01\uff1f\u5c31\u662f\u5b9e\u73b0\u7c7b\u5bf9\u8c61  \u4e5f\u5c31\u662fthis\n     *\/\n    public synchronized void payTicket() {\n        \/\/ \u5148\u5224\u65ad\u7968\u662f\u5426\u5b58\u5728\n        if (ticket &gt; 0) {\n            \/\/ \u7968\u5b58\u5728\uff0c\u5356\u7968\uff0cticket--\n            System.out.println(Thread.currentThread().getName() + &quot;--&gt;\u6b63\u5728\u5356\u7b2c&quot; + ticket + &quot;\u5f20\u7968&quot;);\n            ticket--;\n        }\n    }\n\n}\n<\/code><\/pre>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325;\n\npublic class TicketThreadTest {\n\n    public static void main(String[] args) {\n        TicketThread t = new TicketThread();\n        Thread t0 = new Thread(t);\n        Thread t1 = new Thread(t);\n        Thread t2 = new Thread(t);\n        t0.start();\n        t1.start();\n        t2.start();\n    }\n\n}\n<\/code><\/pre>\n<p>\u6b7b\u9501\uff1a\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u5171\u540c\u8d44\u6e90\uff0c\u4e14\u5904\u4e8e\u4e92\u76f8\u7b49\u5f85\u72b6\u6001\uff0c\u4f1a\u5bfc\u81f4\u6b7b\u9501<\/p>\n<p>sleep\u8ba9\u5f53\u524d\u7ebf\u7a0b\u5904\u4e8e\u4f11\u7720\u72b6\u6001\uff0c\u4f46\u662f\u4e0d\u662f\u653e\u8d44\u6e90<\/p>\n<p>wait\u8ba9\u5f53\u524d\u7ebf\u7a0b\u5904\u4e8e\u7b49\u5f85\u72b6\u6001\uff0c\u91ca\u653e\u8d44\u6e90\uff0c\u4f46\u662f\u9700\u8981\u901a\u8fc7notify\/notifyAll\u8fdb\u884c\u5524\u9192<\/p>\n<p><strong>\u7ebf\u7a0b\u7684\u4e94\u79cd\u72b6\u6001\uff08\u7ebf\u7a0b\u751f\u547d\u5468\u671f\uff09<\/strong><\/p>\n<p>1.\u65b0\u5efa\u72b6\u6001\uff1a\u7ebf\u7a0b\u88ab\u5efa\u7acb<\/p>\n<p>2.\u5c31\u7eea\u72b6\u6001\uff1a\u5c06\u65b0\u5efa\u7684\u7ebf\u7a0b\uff0c\u52a0\u5165\u5230\u6267\u884c\u961f\u5217\u4e2d<\/p>\n<p>3.\u8fd0\u884c\u72b6\u6001\uff1a\u7ebf\u7a0b\u88ab\u6267\u884c<\/p>\n<p>4.\u963b\u585e\u72b6\u6001\uff1a\u6267\u884c\u8fc7\u7a0b\u4e2d\u53d1\u751f\u4e86\u7b49\u5f85\u72b6\u6001\uff0c\u5bfc\u81f4\u7ebf\u7a0b\u6682\u505c<\/p>\n<p>5.\u6d88\u4ea1\u72b6\u6001\uff1a\u7ebf\u7a0b\u7ed3\u675f<\/p>\n<p>\u540c\u6b65\uff1a\u987a\u5e8f\u6267\u884c\uff08ABCD\u63a5\u529b\u8d5b\uff09<\/p>\n<p>\u5f02\u6b65\uff1a\u540c\u65f6\u6267\u884c\uff08ABCD\u6bd4\u8d5b\uff09<\/p>\n<p><strong>23\u79cd\u8bbe\u8ba1\u6a21\u5f0f<\/strong><\/p>\n<p>\u5355\u4f8b\u6a21\u5f0f\uff1a\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b<\/p>\n<p>\u200b   1.\u5c06\u6784\u9020\u65b9\u6cd5\u79c1\u6709\u5316<\/p>\n<p>\u200b   2.\u8bbe\u7f6e\u516c\u5171\u7684\u9759\u6001\u65b9\u6cd5\u8fd4\u56de\u5f53\u524d\u7c7b\u5bf9\u8c61<\/p>\n<p>\u61d2\u6c49\u6a21\u5f0f\uff1a\u4f7f\u7528\u65f6\u624d\u521b\u5efa<\/p>\n<p>\u997f\u6c49\u6a21\u5f0f\uff1a\u4f7f\u7528\u524d\u5c31\u521b\u5efa\u597d\u5bf9\u8c61<\/p>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325;\n\npublic class Earth {\n    \/\/ \u61d2\u6c49\u6a21\u5f0f\uff0c\u4f7f\u7528\u65f6\u624d\u4f1a\u521b\u5efa\n\/\/  private static Earth earth;\n\/\/  private Earth() {\n\/\/      System.out.println(&quot;\u521b\u5efa\u5bf9\u8c61&quot;);\n\/\/  }\n\/\/  \n\/\/  public static Earth getEarth() {\n\/\/      if(earth == null) {\n\/\/          earth = new Earth();\n\/\/      }\n\/\/      return earth;\n\/\/  }\n    \/\/ \u997f\u6c49\u6a21\u5f0f\uff0c\u4e8b\u5148\u521b\u5efa\u597d\u5bf9\u8c61\n    private static Earth earth = new Earth();\n\n    private Earth() {\n        System.out.println(&quot;\u521b\u5efa\u4e86\u5bf9\u8c61&quot;);\n    }\n\n    public static Earth getEarth() {\n        return earth;\n    }\n\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">public class EarthTest {\n    public static void main(String[] args) {\n        Earth e1 = Earth.getEarth();\n        Earth e2 = Earth.getEarth();\n\n        System.out.println(e1 == e2);\n    }\n}<\/code><\/pre>\n<p><strong>\u5de5\u5382\u6a21\u5f0f<\/strong>\uff1a\u5de5\u5382\u91cc\u6709n\u4e2a\u7ba1\u7406\u7c7b\uff0c\u7edf\u4e00\u7531\u5de5\u5382\u6765\u4ea7\u751f\u5bf9\u8c61<\/p>\n<p><strong>\u679a\u4e3e<\/strong>\uff1a\u5c06\u53ef\u4ee5\u9009\u62e9\u7684\u6570\u636e\uff0c\u4e00\u4e00\u5217\u51fa\uff0c\u53ea\u80fd\u9009\u62e9\u7ed9\u4f60\u5217\u51fa\u7684\u6570\u636e<\/p>\n<pre><code class=\"language-Java\">public class Animal {\n\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">public class Cat extends Animal {\n\n    public Cat() {\n        System.out.println(&quot;Cat \u5bf9\u8c61&quot;);\n    }\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">public enum AnimalType {\n    CAT, DOG, PIG;\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">public class AnimalFactory {\n\n    public static Animal getAnimal(AnimalType i) {\n        Animal a = null;\n        switch (i) {\n        case CAT:\n            a = new Cat();\n            break;\n        case DOG:\n            a = new Dog();\n            break;\n        case PIG:\n            a = new Pig();\n            break;\n        }\n        return a;\n    }\n\n}\n<\/code><\/pre>\n<pre><code class=\"language-Java\">public class TestFactory {\n\n    public static void main(String[] args) {\n        AnimalFactory.getAnimal(AnimalType.PIG);\n    }\n\n}\n<\/code><\/pre>\n<h2>JDK 8\u65b0\u7279\u6027<\/h2>\n<h3>lamada\u8868\u8fbe\u5f0f<\/h3>\n<p>\u4e3b\u8981\u9488\u5bf9\u662f\u63a5\u53e3\uff0c\u4e14\u63a5\u53e3\u4e2d\u53ea\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\uff0c\u66ff\u6362\u533f\u540d\u5185\u90e8\u7c7b\u7684<\/p>\n<h4><strong>\u65e0\u53c2\u6570\u65e0\u8fd4\u56de\u503c<\/strong><\/h4>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325.p2;\n\npublic class Demo01 {\n    public static void main(String[] args) {\n        \/\/ \u2460\u533f\u540d\u5185\u90e8\u7c7b\n        Interface1 interface1 = new Interface1() {\n            @Override\n            public void method() {\n                System.out.println(&quot;\u54c8\u54c8\u54c8\u54c8&quot;);\n            }\n        };\n        interface1.method();\n\n        \/\/ \u4e3b\u8981\u9488\u5bf9\u662f\u63a5\u53e3\uff0c\u4e14\u63a5\u53e3\u4e2d\u53ea\u6709\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\uff0c\u66ff\u6362\u533f\u540d\u5185\u90e8\u7c7b\u7684\n        \/\/ \u2461lamada\u8868\u8fbe\u5f0f\u65b9\u5f0f\u4e00\n        Interface1 interface2 = () -&gt; {\n            System.out.println(&quot;\u5566\u5566\u5566\u5566&quot;);\n        };\n        interface2.method();\n\n        \/\/ \u2462\u7531\u4e8e\u53ea\u6709\u4e00\u6761\u8bed\u53e5\uff0c\u6240\u4ee5{}\u53ef\u4ee5\u7701\u7565\n        Interface1 interface3 = () -&gt; System.out.println(&quot;\u8be5\u5403\u996d\u4e86&quot;);\n        interface3.method();\n    }\n\n}\n\ninterface Interface1 {\n    \/\/ \u65e0\u53c2\u6570\u65e0\u8fd4\u56de\u503c\n    public abstract void method();\n}\n<\/code><\/pre>\n<h4><strong>\u65e0\u53c2\u6570\u6709\u8fd4\u56de\u503c<\/strong><\/h4>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325.p2;\n\npublic class Demo02 {\n\n    public static void main(String[] args) {\n        \/\/ \u2460\n        Interface2 i1 = new Interface2() {\n            @Override\n            public int method() {\n                return 100;\n            }\n        };\n        System.out.println(i1.method());\n\n        \/\/ \u2461\n        Interface2 i2 = () -&gt; {\n            return 200;\n        };\n        System.out.println(i2.method());\n\n        \/\/ \u2462\n        Interface2 i3 = () -&gt; 300;\n        System.out.println(i3.method());\n\n    }\n}\n\ninterface Interface2 {\n    \/\/ \u65e0\u53c2\u6570\u6709\u8fd4\u56de\u503c\n    public abstract int method();\n}\n<\/code><\/pre>\n<h4><strong>\u6709\u53c2\u6570\u65e0\u8fd4\u56de\u503c<\/strong><\/h4>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325.p2;\n\npublic class Demo03 {\n\n    public static void main(String[] args) {\n        \/\/ \u2460\n        Interface3 i1 = new Interface3() {\n            @Override\n            public void method(int x, int y) {\n                System.out.println(&quot;x=&quot; + x + &quot;,y=&quot; + y);\n            }\n        };\n        i1.method(1, 2);\n\n        \/\/ \u2461\n        Interface3 i2 = (int x, int y) -&gt; {\n            System.out.println(&quot;x=&quot; + x + &quot;,y=&quot; + y);\n        };\n        i2.method(3, 4);\n\n        \/\/ \u2462\n        Interface3 i3 = (int x, int y) -&gt; System.out.println(&quot;x=&quot; + x + &quot;,y=&quot; + y);\n        i3.method(5, 6);\n\n        \/\/ \u2463\n        Interface3 i4 = (x, y) -&gt; System.out.println(&quot;x=&quot; + x + &quot;,y=&quot; + y);\n        i4.method(7, 8);\n    }\n\n}\n\ninterface Interface3 {\n    \/\/ \u6709\u53c2\u6570\u65e0\u8fd4\u56de\u503c\n    public abstract void method(int x, int y);\n}\n<\/code><\/pre>\n<h4><strong>\u6709\u53c2\u6570\u6709\u8fd4\u56de\u503c<\/strong><\/h4>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325.p2;\n\npublic class Demo04 {\n\n    public static void main(String[] args) {\n        \/\/ \u2460\n        Interface4 i1 = new Interface4() {\n            @Override\n            public int method(int x, int y) {\n                return x + y;\n            }\n        };\n        System.out.println(i1.method(1, 2));\n\n        \/\/ \u2461\n        Interface4 i2 = (int x, int y) -&gt; {\n            return x + y;\n        };\n        System.out.println(i2.method(3, 4));\n\n        \/\/ \u2462\n        Interface4 i3 = (x, y) -&gt; x + y;\n        System.out.println(i3.method(9, 10));\n    }\n\n}\n\ninterface Interface4 {\n    \/\/ \u6709\u53c2\u6570\u6709\u8fd4\u56de\u503c\n    public abstract int method(int x, int y);\n}\n<\/code><\/pre>\n<h4>\u96c6\u5408\u904d\u5386<\/h4>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325.p2;\n\nimport java.util.ArrayList;\nimport java.util.function.Consumer;\n\npublic class Demo05 {\n\n    public static void main(String[] args) {\n        ArrayList&lt;String&gt; list = new ArrayList&lt;&gt;();\n        list.add(&quot;tom&quot;);\n        list.add(&quot;rose&quot;);\n        list.add(&quot;jack&quot;);\n        list.add(&quot;kimi&quot;);\n        list.add(&quot;july&quot;);\n        \/\/ \u51fd\u6570\u5f0f\u63a5\u53e3--Consumer\u63a5\u53e3\n        list.forEach(new Consumer&lt;String&gt;() {\n            @Override\n            public void accept(String t) {\n                System.out.println(t);\n            }\n        });\n\n        System.out.println(&quot;=======================&quot;);\n        list.forEach((String t) -&gt; System.out.println(t));\n\n        System.out.println(&quot;=======================&quot;);\n        list.forEach((t) -&gt; System.out.println(t));\n\n        \/\/ \u5c31\u662f\u628a\u96c6\u5408\u5f53\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u90fd\u8d4b\u503c\u7ed9\u4e86t\uff0c\u7136\u540e\u8f93\u51fat\n        System.out.println(&quot;=======================&quot;);\n        list.forEach(t -&gt; System.out.println(t));\n\n        System.out.println(&quot;************************&quot;);\n        list.forEach(System.out::println);\n\n    }\n}<\/code><\/pre>\n<h4><strong>\u53ef\u4ee5\u8c03\u7528\u9759\u6001\u65b9\u6cd5<\/strong><\/h4>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325.p2;\n\npublic class Demo06 {\n\n    public static void main(String[] args) {\n        Interface6 i1 = new Interface6() {\n            @Override\n            public int getInt(String s) {\n                return Integer.parseInt(s);\n            }\n        };\n        System.out.println(i1.getInt(&quot;123&quot;) + 1);\n\n        Interface6 i2 = (s) -&gt; Integer.parseInt(s);\n        System.out.println(i2.getInt(&quot;456&quot;) + 1);\n        \/*\n         *  \u8fd9\u91cc\u5b83\u7531\u4e8e\u662f\u4e00\u4e2a\u53c2\u6570\uff0c\u5b83\u628a\u5f88\u591a\u4e1c\u897f\u90fd\u53ef\u4ee5\u7701\u7565\n         *  parseInt\u662f\u7528\u7c7b\u8c03\u7528\uff0c\u8bf4\u660e\u662f\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5\uff0c\u9759\u6001\u65b9\u6cd5\u53ef\u4ee5\u76f4\u63a5\u8c03\u7528\n         *\/\n        Interface6 i3 = Integer::parseInt;\n        System.out.println(i3.getInt(&quot;780&quot;) + 1);\n    }\n\n}\n\ninterface Interface6 {\n    int getInt(String s);\n}<\/code><\/pre>\n<h4>\u6784\u9020\u65b9\u6cd5<\/h4>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325.p2;\n\npublic class Demo07 {\n    public static void main(String[] args) {\n        Interface7 i1 = new Interface7() {\n            @Override\n            public Person getPerson() {\n                return new Person();\n            }\n        };\n        i1.getPerson();\n        \/\/ \u6784\u9020\u65b9\u6cd5\n        Interface7 i2 = Person :: new;\n        i2.getPerson();\n    }\n}\nclass Person {\n    public Person() {\n        System.out.println(&quot;\u521b\u5efaPerson\u5bf9\u8c61&quot;);\n    }\n}\ninterface Interface7{\n    public Person getPerson();\n}<\/code><\/pre>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325.p2;\n\npublic class Demo08 {\n\n    public static void main(String[] args) {\n        \/\/ \u6709\u53c2\u6784\u9020\u65b9\u6cd5\n        Interface8 i1 = Student::new;\n        i1.getStudent(&quot;tom&quot;, 18);\n\n        Interface8 i2 = new Interface8() {\n            @Override\n            public Student getStudent(String name, int age) {\n                return new Student(name, age);\n            }\n        };\n        i2.getStudent(&quot;amy&quot;, 20);\n    }\n}\nclass Student {\n    public Student(String name, int age) {\n        System.out.println(name + &quot;\\t&quot; + age);\n    }\n}\ninterface Interface8 {\n    public Student getStudent(String name, int age);\n}<\/code><\/pre>\n<h3>\u65f6\u95f4\u7c7b<\/h3>\n<p>LocalDate<\/p>\n<p>LocalTime<\/p>\n<p>LacalDateTime<\/p>\n<pre><code class=\"language-Java\">package com.zretc.javase.d0325.p3;\n\nimport java.text.SimpleDateFormat;\nimport java.time.LocalDate;\nimport java.time.LocalDateTime;\nimport java.time.LocalTime;\nimport java.time.format.DateTimeFormatter;\nimport java.util.Calendar;\n\npublic class Demo {\n\n    public static void main(String[] args) {\n        Calendar cal = Calendar.getInstance();\n        System.out.println(cal);\n        \/\/ \u83b7\u53d6Date\u5bf9\u8c61\n        System.out.println(cal.getTime());\n        SimpleDateFormat f = new SimpleDateFormat(&quot;yyyy-MM-dd HH:mm:ss&quot;);\n        \/\/ \u8f6c\u6210\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\n        System.out.println(f.format(cal.getTime()));\n        System.out.println(cal.get(Calendar.MONTH) + 1 + &quot;\u6708&quot;);\/\/ 0-11\n        System.out.println(cal.get(Calendar.DAY_OF_WEEK) - 1);\/\/ 1-7 \u5468\u65e5\u662f\u7b2c\u4e00\u5929\n\n        \/\/ jdk 8\u4e4b\u540e\u65b0\u589e\u65f6\u95f4\u7c7b\n        LocalDate ld = LocalDate.now();\/\/ \u83b7\u53d6\u5f53\u524d\u7cfb\u7edf\u65f6\u95f4\n        System.out.println(ld);\/\/ 2022-03-25\n\n        LocalDate ld2 = LocalDate.of(2023, 3, 1);\/\/ \u6307\u5b9a\u65f6\u95f4\n        System.out.println(ld2);\n        \/\/ \u901a\u8fc7\u63a7\u5236\u5f53\u524d\u8d4b\u503c\u7684\u6b63\u8d1f\u6570\uff0c\u5b8c\u6210\u662f\u52a0\u8fd8\u662f\u51cf\n        ld2 = ld2.plusYears(-3);\n        System.out.println(ld2);\n        \/\/ \u6708\u4efd\n        ld2 = ld2.plusMonths(-13);\n        System.out.println(ld2);\n        \/\/ \u65e5\u671f\n        ld2 = ld2.plusDays(1);\n        System.out.println(ld2);\n        \/\/ \u5468,1\u4ee3\u88687\u5929\n        ld2 = ld2.plusWeeks(2);\n        System.out.println(ld2);\n\n        System.out.println(&quot;=========================&quot;);\n        \/\/ \u683c\u5f0f\u5316\n        DateTimeFormatter dtf = DateTimeFormatter.ISO_LOCAL_DATE;\/\/ \u83b7\u53d6\u7cfb\u7edf\u8bbe\u7f6e\u597d\u7684\u65f6\u95f4\u683c\u5f0f\n        System.out.println(dtf);\n        \/\/ \u8f6c\u6210\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\n        System.out.println(dtf.format(ld));\/\/ 2022-03-25\n        \/\/ \u8bbe\u7f6e\u65f6\u95f4\u683c\u5f0f\n        DateTimeFormatter dtf2 = DateTimeFormatter.ofPattern(&quot;yyyy\/MM\/dd&quot;);\n        \/\/ \u8f6c\u6210\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\n        System.out.println(dtf2.format(ld));\/\/ 2022\/03\/25\n\n        System.out.println(&quot;***************************&quot;);\n        \/\/ \u65f6\u5206\u79d2\u6beb\u79d2\n        LocalTime lt = LocalTime.now();\n        System.out.println(lt);\n        \/\/ \u683c\u5f0f\u5316\u5b57\u7b26\u4e32\n        DateTimeFormatter d1 = DateTimeFormatter.ofPattern(&quot;HH:mm:ss:SSS&quot;);\/\/ HH:24\u8fdb\u5236 hh\uff1a12\u8fdb\u5236\n        System.out.println(d1.format(lt));\n\n        System.out.println(&quot;############################&quot;);\n        \/\/ \u5e74\u6708\u65e5-\u5341\u5206\u79d2\u6beb\u79d2\n        LocalDateTime lt2 = LocalDateTime.now();\n        System.out.println(lt2);\n        \/\/ \u683c\u5f0f\u5316\u5b57\u7b26\u4e32\n        DateTimeFormatter d2 = DateTimeFormatter.ofPattern(&quot;dd\/MM\/yyyy HH:mm:ss&quot;);\n        String str = d2.format(lt2);\n        System.out.println(str);\n\n    }\n\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Java\u7b80\u4ecb Java\u53d1\u5e03\u4e8e1995\u5e745\u670823\u65e5\uff0cJava\u524d\u8eab\u662fOak\u8bed\u8a00\uff0c\u884d\u751f\u81eaC++\uff0cJava\u4e4b\u7236\u662f\u8a79\u59c6\u65af [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[4],"class_list":["post-34","post","type-post","status-publish","format-standard","hentry","category-3","tag-java"],"_links":{"self":[{"href":"https:\/\/boki.shifengzhi.top\/index.php?rest_route=\/wp\/v2\/posts\/34","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/boki.shifengzhi.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/boki.shifengzhi.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/boki.shifengzhi.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/boki.shifengzhi.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=34"}],"version-history":[{"count":1,"href":"https:\/\/boki.shifengzhi.top\/index.php?rest_route=\/wp\/v2\/posts\/34\/revisions"}],"predecessor-version":[{"id":35,"href":"https:\/\/boki.shifengzhi.top\/index.php?rest_route=\/wp\/v2\/posts\/34\/revisions\/35"}],"wp:attachment":[{"href":"https:\/\/boki.shifengzhi.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=34"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/boki.shifengzhi.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=34"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/boki.shifengzhi.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=34"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}