{"id":31412,"date":"2023-08-30T13:54:47","date_gmt":"2024-02-11T02:08:36","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e7%9a%84%e4%bb%bb%e4%bd%95%e4%ba%8b%e6%83%85%e9%83%bd%e5%8f%af%e4%bb%a5%e8%ae%b0%e5%bd%95%e3%80%82\/"},"modified":"2025-08-12T23:54:57","modified_gmt":"2025-08-12T15:54:57","slug":"java%e7%9a%84%e4%bb%bb%e4%bd%95%e4%ba%8b%e6%83%85%e9%83%bd%e5%8f%af%e4%bb%a5%e8%ae%b0%e5%bd%95%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e7%9a%84%e4%bb%bb%e4%bd%95%e4%ba%8b%e6%83%85%e9%83%bd%e5%8f%af%e4%bb%a5%e8%ae%b0%e5%bd%95%e3%80%82\/","title":{"rendered":"Java\u7684\u4efb\u4f55\u4e8b\u60c5\u90fd\u53ef\u4ee5\u8bb0\u5f55"},"content":{"rendered":"

\u6084\u6084\u5730\u5728\u5b66\u4e60\u4e2d\uff0c\u4e3a\u4e86\u5fd8\u8bb0\u4e86\u8981\u81ea\u5df1\u641c\u7d22\u4e00\u4e0b\u3002<\/p>\n

\u8bbe\u5b9a\u7684\u6570\u76ee<\/p>\n
final<\/span> \u30c7\u30fc\u30bf\u578b<\/span> \u5b9a\u6570\u540d<\/span> =<\/span> \u5024<\/span>\r\n<\/code><\/pre>\n
\u628a\u4ee5\u4e0b\u5185\u5bb9\u7528\u4e2d\u6587\u672c\u5730\u5316\u6539\u5199\uff0c\u53ea\u9700\u8981\u7ed9\u51fa\u4e00\u4e2a\u9009\u9879\uff1a\u65e0<\/p>\n
\u6ca1\u6709\u53c2\u7167\u5bf9\u8c61\u7684\u72b6\u6001
\n\u7a7a(“”)\u5b57\u7b26\u4e32\u662f\u6307\u5b58\u5728\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32\u7684\u53c2\u7167\u5bf9\u8c61\uff0c\u56e0\u6b64\u4e0d\u662fnull
\n\u2192 \u5bf9\u4e8e\u539f\u59cb\u7c7b\u578b\uff0c\u4e0d\u5b58\u5728null\u8fd9\u4e2a\u72b6\u6001<\/p>\n
\u6211\u60f3\u8981\u8fdb\u884c\u6bd4\u8f83\u3002\u5982\u679c\u4f7f\u7528null\u7684equals\u65b9\u6cd5\uff0c\u4f1a\u5bfc\u81f4\u5f02\u5e38\u53d1\u751f\uff08NullPointerException\uff09\u3002\u53ef\u4ee5\u4f7f\u7528”==”\u64cd\u4f5c\u7b26\u3002<\/p>\n
\u5728\u6c49\u8bed\u4e2d\uff0c\u7a7a\u6587\u5b57\u662f\u4f7f\u7528”isEmpty”\u65b9\u6cd5\u4f1a\u66f4\u597d<\/p>\n
\u4f20\u627f\u53ef\u4ee5\u901a\u8fc7\u6269\u5c55\u73b0\u6709\u7684\u7c7b\u6765\u521b\u5efa\u5b50\u7c7b\u3002
\n\u5b50\u7c7b\u4f1a\u7ee7\u627f\u8d85\u7c7b\u7684\u5b57\u6bb5\u548c\u65b9\u6cd5\u3002
\n\u8981\u8bbf\u95ee\u8d85\u7c7b\u7684\u65b9\u6cd5\uff0c\u8bf7\u4f7f\u7528 super \u5173\u952e\u5b57\u3002
\n\u8981\u8bbf\u95ee\u5b50\u7c7b\u7684\u65b9\u6cd5\uff0c\u8bf7\u4f7f\u7528 this \u5173\u952e\u5b57\u3002
\n\u8d85\u7c7b\u53ea\u6709\u4e00\u4e2a\uff0c\u800c\u5b50\u7c7b\u53ef\u4ee5\u6709\u591a\u4e2a\u3002<\/p>\n
super<\/span>.<\/span>hoge<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u8986\u5199\u5728\u5b50\u7c7b\u4e2d\u5b9e\u73b0\u7236\u7c7b\u7684\u65b9\u6cd5\u540d\u3001\u8fd4\u56de\u503c\u548c\u53c2\u6570\u76f8\u5339\u914d\u7684\u65b9\u6cd5\u3002\u663e\u5f0f\u5730\u6dfb\u52a0\u201c@Override\u201d\u597d\u50cf\u662f\u4e2a\u597d\u4e3b\u610f\u3002<\/p>\n
\/\/\u5b50\u30af\u30e9\u30b9<\/span>\r\n@Override<\/span>\r\nvoid<\/span> hoge<\/span>(){<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u91cd\u5199\u7684\u65b9\u6cd5\u4f1a\u4f18\u5148\u9009\u62e9\u5b50\u7c7b\u7684\u65b9\u6cd5\u3002<\/p>\n
\u62bd\u8c61\u7c7b\u65e0\u6cd5\u521b\u5efa\u5b9e\u4f8b\u7684\u7c7b<\/p>\n
abstract<\/span> class<\/span> TestClass<\/span> {<\/span>\r\n    void<\/span> test<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"TEST\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\npublic<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        \/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u578b TestClass \u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3067\u304d\u307e\u305b\u3093<\/span>\r\n        TestClass<\/span> tc<\/span> =<\/span> new<\/span> TestClass<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u62bd\u8c61\u65b9\u6cd5<\/p>\n
    \n
  • \n
      \u30e1\u30bd\u30c3\u30c9\u5185\u306b\u547d\u4ee4\u306e\u5165\u3063\u3066\u306a\u3044\u30e1\u30bd\u30c3\u30c9\u306e\u3053\u3068<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        \n
      • \n
          \u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u62bd\u8c61\u30af\u30e9\u30b9\u306b\u5b9a\u7fa9\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n
           <\/p>\n
            \u62bd\u8c61\u30af\u30e9\u30b9\u3092\u7d99\u627f\u3057\u305f\u30b5\u30d6\u30af\u30e9\u30b9\u306f\u3001\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3057\u306a\u3044\u9650\u308a\u62bd\u8c61\u30af\u30e9\u30b9\u306e\u307e\u307e\uff08\uff1f\uff1f\uff09<\/ul>\n
            abstract<\/span> class<\/span> TestClass<\/span> {<\/span>\r\n    \/\/\u666e\u901a\u306e\u30e1\u30bd\u30c3\u30c9<\/span>\r\n    void<\/span> test<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"TEST\"<\/span>);<\/span>\r\n    }<\/span>\r\n    \/\/\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9<\/span>\r\n    abstract<\/span> void<\/span> test2<\/span>();<\/span>\r\n}<\/span>\r\n\r\nabstract<\/span> class<\/span> TestClass<\/span> {<\/span>\r\n    \/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306f\u672c\u6587\u3092\u6307\u5b9a\u3057\u307e\u305b\u3093<\/span>\r\n    abstract<\/span> void<\/span> test<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"TEST\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
            \u5982\u679c\u7ee7\u627f\u4e86\u62bd\u8c61\u7c7b\uff0c\u5e76\u4e14\u5c06\u5b50\u7c7b\u5b9a\u4e49\u4e3a\u62bd\u8c61\u7c7b\uff0c\u90a3\u4e48\u662f\u4e0d\u662f\u610f\u5473\u7740\u4e0d\u9700\u8981\u8fdb\u884c\u8986\u5199\u5462\u3002\u3002<\/p>\n
            abstract<\/span> class<\/span> TestClass<\/span> {<\/span>\r\n    \/\/\u666e\u901a\u306e\u30e1\u30bd\u30c3\u30c9<\/span>\r\n    void<\/span> test<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"TEST\"<\/span>);<\/span>\r\n    }<\/span>\r\n    \/\/\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9<\/span>\r\n    abstract<\/span> void<\/span> test2<\/span>();<\/span>\r\n}<\/span>\r\n\r\n\/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3044<\/span>\r\nabstract<\/span> class<\/span> subClass<\/span> extends<\/span> TestClass<\/span> {<\/span>\r\n}<\/span>\r\n\r\n\/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u578b subClass \u306f\u7d99\u627f\u3055\u308c\u305f\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9 TestClass.test2() \u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059<\/span>\r\nclass<\/span> subClass<\/span> extends<\/span> TestClass<\/span> {<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
            \u63a5\u53e3<\/p>\n
              \n
            • \n
                \u30af\u30e9\u30b9\u304c\u6301\u3064\u3079\u304d\u3001\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u305f\u3082\u306e<\/ul>\n<\/li>\n<\/ul>\n
                 <\/p>\n
                  \n
                • \n
                    \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u5b9a\u7fa9\u3057\u305f\u3082\u306e\u306f\u3001\u30af\u30e9\u30b9\u3067\u5b9f\u88c5\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n
                     <\/p>\n
                      \n
                    • \n
                        \u30af\u30e9\u30b9\u3067\u5b9f\u88c5\u3059\u308b\u3082\u306e\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u5b9a\u7fa9\u3057\u305f\u30e1\u30bd\u30c3\u30c9\u3059\u3079\u3066\u3002<\/ul>\n<\/li>\n<\/ul>\n
                         <\/p>\n
                          \n
                        • \n
                            \u7d99\u627f\u306e\u3088\u3046\u306b\u3001\uff11\u5bfe\uff2e\u3067\u306f\u306a\u304f\u3002\uff2e\u5bfe\uff2e\u306e\u591a\u91cd\u7d99\u627f\u304c\u3067\u304d\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n
                             <\/p>\n
                              \n
                            • \n
                                \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6697\u9ed9\u7684\u306b\u300cpublic abstract\u300d\u4fee\u98fe\u5b50\u4ed8\u304d\u3068\u3057\u3066\u6271\u308f\u308c\u308b\u306e\u3067\u3001\u5b9f\u88c5\u3059\u308b\u969b\u306f\u3001\u5fc5\u305a\u300cpublic\u300d\u4fee\u98fe\u5b50\u3092\u4ed8\u3051\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n
                                 <\/p>\n
                                  \n
                                • \n
                                    \u30af\u30e9\u30b9\u3067\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u3068\u304d\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u300c,\u300d\u3067\u533a\u5207\u308b<\/ul>\n<\/li>\n<\/ul>\n
                                     <\/p>\n
                                      \n
                                    • \n
                                        \u30e1\u30bd\u30c3\u30c9\u3060\u3051\u3058\u3083\u306a\u304f\u3066\u3001\u5b9a\u6570\u3082\u5b9a\u7fa9\u3067\u304d\u308b<\/ul>\n<\/li>\n<\/ul>\n
                                         <\/p>\n
                                          \n
                                        • \n
                                            \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u5909\u6570\u306f\u3001\u4fee\u98fe\u5b50\u306a\u3057\u3067\u3001\u6697\u9ed9\u7684\u306b<\/ul>\n<\/li>\n<\/ul>\n
                                             <\/p>\n
                                              \n
                                            • \n
                                                \u300cpublic static final\u300d\u4ed8\u304d\u3001\u3064\u307e\u308a\u3001\u5b9a\u6570\u306b\u306a\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n
                                                 <\/p>\n
                                                  \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3082\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u7d99\u627f\u3067\u304d\u308b\u3002<\/ul>\n
                                                  interface<\/span> testIf<\/span>{<\/span>\r\n    int<\/span> test<\/span>();<\/span>\r\n    void<\/span> test2<\/span>(<\/span>String<\/span> msg<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                                  interface<\/span> testIf<\/span>{<\/span>\r\n    void<\/span> test2<\/span>(<\/span>String<\/span> msg<\/span>);<\/span>\r\n}<\/span>\r\n\/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u578b test \u306f\u7d99\u627f\u3055\u308c\u305f\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9 testIf.test2(String) \u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059<\/span>\r\nclass<\/span> test<\/span> implements<\/span> testIf<\/span>{<\/span>\r\n\r\n}<\/span>\r\n\r\n\/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1atestIf \u304b\u3089\u7d99\u627f\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u306e\u53ef\u8996\u6027\u3092\u4e0b\u3052\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093<\/span>\r\nclass<\/span> test<\/span> implements<\/span> testIf<\/span>{<\/span>\r\n    void<\/span> test2<\/span>(<\/span>String<\/span> msg<\/span>)<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>msg<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n\/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306a\u3057<\/span>\r\nclass<\/span> test<\/span> implements<\/span> testIf<\/span>{<\/span>\r\n    public<\/span> void<\/span> test2<\/span>(<\/span>String<\/span> msg<\/span>)<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>msg<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
                                                  \u5728\u4e2d\u6587\u4e2d\uff0c\u53ef\u4ee5\u8fd9\u6837\u8868\u8fbe\uff1a\u540c\u65f6\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3\u3002<\/p>\n
                                                  interface<\/span> testIf1<\/span>{<\/span>\r\n    void<\/span> test1<\/span>(<\/span>String<\/span> msg<\/span>);<\/span>\r\n}<\/span>\r\n\r\ninterface<\/span> testIf2<\/span>{<\/span>\r\n    int<\/span> test2<\/span>();<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> test<\/span> implements<\/span> testIf1<\/span>,<\/span> testIf2<\/span>{<\/span>\r\n    public<\/span> void<\/span> test1<\/span>(<\/span>String<\/span> msg<\/span>)<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>msg<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> int<\/span> test2<\/span>()<\/span> {<\/span>\r\n        return<\/span> 1<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                                  \u5728\u63a5\u53e3\u4e2d\u5b9a\u4e49\u5e38\u91cf<\/p>\n
                                                  interface<\/span> testIf1<\/span>{<\/span>\r\n    int<\/span> HOGE<\/span> =<\/span> 1<\/span>;<\/span>\r\n    public<\/span> static<\/span> final<\/span> String<\/span> HOGE2<\/span> =<\/span> \"\u5b9a\u6570\"<\/span>;<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> test<\/span> implements<\/span> testIf1<\/span>{<\/span>\r\n    int<\/span> i<\/span> =<\/span> testIf1<\/span>.<\/span>HOGE<\/span>;<\/span>\r\n    \/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1afinal \u30d5\u30a3\u30fc\u30eb\u30c9 testIf1.HOGE \u306b\u306f\u4ee3\u5165\u3067\u304d\u307e\u305b\u3093<\/span>\r\n    \/\/testIf1.HOGE = 1;<\/span>\r\n    void<\/span> testPrint<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>testIf1<\/span>.<\/span>HOGE2<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\npublic<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        test<\/span> t<\/span> =<\/span> new<\/span> test<\/span>();<\/span>\r\n        t<\/span>.<\/span>testPrint<\/span>();<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
                                                  \u63a5\u53e3\u7684\u7ee7\u627f de<\/p>\n
                                                  interface<\/span> testIf1<\/span>{<\/span>\r\n    int<\/span> HOGE<\/span> =<\/span> 1<\/span>;<\/span>\r\n    public<\/span> static<\/span> final<\/span> String<\/span> HOGE2<\/span> =<\/span> \"\u5b9a\u6570\"<\/span>;<\/span>\r\n    void<\/span> test<\/span>();<\/span>\r\n    void<\/span> test2<\/span>();<\/span>\r\n}<\/span>\r\n\/\/\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u7d99\u627f<\/span>\r\ninterface<\/span> testIf2<\/span> extends<\/span> testIf1<\/span>{<\/span>\r\n    void<\/span> test<\/span>();<\/span>\r\n}<\/span>\r\n\r\n\/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u578b test \u306f\u7d99\u627f\u3055\u308c\u305f\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9 testIf1.test2() \u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059<\/span>\r\nclass<\/span> test<\/span> implements<\/span> testIf2<\/span>{<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> test<\/span>()<\/span> {<\/span>\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u30fb\u30b9\u30bf\u30d6<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n\/\/\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306a\u3057<\/span>\r\nclass<\/span> test<\/span> implements<\/span> testIf2<\/span>{<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> test<\/span>()<\/span> {<\/span>\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u30fb\u30b9\u30bf\u30d6<\/span>\r\n    }<\/span>\r\n\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> test2<\/span>()<\/span> {<\/span>\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u30fb\u30b9\u30bf\u30d6        <\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                                  \u5373\u4f7f\u5728\u7236\u63a5\u53e3\u548c\u5b50\u63a5\u53e3\u4e2d\u6709\u76f8\u540c\u7684\u65b9\u6cd5\u5b9a\u4e49\uff0c\u5b83\u4e0d\u4f1a\u88ab\u89c6\u4e3a\u9519\u8bef\u3002\u5c3d\u7ba1\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6df7\u4e71\u3002<\/p>\n
                                                  \u591a\u614b\u6027
                                                  \n\u5728\u65e5\u8bed\u4e2d\uff0c\u591a\u6001\u6027\uff08\u8868\u793a\u6709\u591a\u6837\u5316\u7684\u884c\u4e3a\uff09\u8fd9\u4e2a\u8bcd\u6709\u8fd9\u4e2a\u610f\u601d\u3002<\/p>\n
                                                    \n
                                                  • \n
                                                      \u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u578b\u306e\u5909\u6570\u306b\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4ee3\u5165\u3067\u304d\u308b<\/ul>\n<\/li>\n<\/ul>\n
                                                       <\/p>\n
                                                        \n
                                                      • \n
                                                          \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u578b\u306e\u5909\u6570\u306b\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4ee3\u5165\u3067\u304d\u308b<\/ul>\n<\/li>\n<\/ul>\n
                                                           <\/p>\n
                                                            \u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3068\u3001\u5909\u6570\u306e\u578b\u306b\u95a2\u4fc2\u306a\u304f\u3001\u5909\u6570\u304c\u53c2\u7167\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u304c\u5b9f\u884c\u3055\u308c\u308b\u3002\uff08\u96e3\u3057\u3044\u3002\u3002\uff09<\/ul>\n
                                                            import<\/span> java.util.ArrayList<\/span>;<\/span>\r\nimport<\/span> java.util.List<\/span>;<\/span>\r\n\r\ninterface<\/span> TestIf<\/span>{<\/span>\r\n    public<\/span> abstract<\/span> void<\/span> run<\/span>();<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> TestAAA<\/span> implements<\/span> TestIf<\/span>{<\/span>\r\n\r\n    String<\/span> myClassName<\/span> =<\/span> \"TestAAA\"<\/span>;<\/span>\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> run<\/span>()<\/span> {<\/span>\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u30fb\u30b9\u30bf\u30d6<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>myClassName<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n\r\nclass<\/span> TestBBB<\/span> implements<\/span> TestIf<\/span>{<\/span>\r\n\r\n    String<\/span> myClassName<\/span> =<\/span> \"TestBBB\"<\/span>;<\/span>\r\n    @Override<\/span>\r\n    public<\/span> void<\/span> run<\/span>()<\/span> {<\/span>\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u30fb\u30b9\u30bf\u30d6<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>myClassName<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n\r\npublic<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n\r\n        \/\/\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u578b\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3001\u914d\u5217\u3092\u7528\u610f<\/span>\r\n        List<\/span><<\/span>TestIf<\/span>><\/span> list<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>TestIf<\/span>>();<\/span>\r\n        TestIf<\/span>[]<\/span> array<\/span> =<\/span> new<\/span> TestIf<\/span>[<\/span>2<\/span>];<\/span>\r\n\r\n        \/\/\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u5404\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8a2d\u5b9a<\/span>\r\n        list<\/span>.<\/span>add<\/span>(<\/span>new<\/span> TestAAA<\/span>());<\/span>\r\n        list<\/span>.<\/span>add<\/span>(<\/span>new<\/span> TestBBB<\/span>());<\/span>\r\n\r\n        \/\/\u914d\u5217\u306b\u5404\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u8a2d\u5b9a<\/span>\r\n        array<\/span>[<\/span>0<\/span>]<\/span> =<\/span> new<\/span> TestAAA<\/span>();<\/span>\r\n        array<\/span>[<\/span>1<\/span>]<\/span> =<\/span> new<\/span> TestBBB<\/span>();<\/span>\r\n\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\"<\/span>);<\/span>\r\n        for<\/span>(<\/span>TestIf<\/span> ti:<\/span> list<\/span>)<\/span> {<\/span>\r\n            ti<\/span>.<\/span>run<\/span>();<\/span>\r\n        }<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u914d\u5217\"<\/span>);<\/span>\r\n        for<\/span>(<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> array<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n            array<\/span>[<\/span>i<\/span>].<\/span>run<\/span>();<\/span>\r\n        }<\/span>\r\n\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                                            \u6284\u5199\/\u590d\u5370<\/p>\n
                                                            \u6570\u7ec4\u7684\u590d\u5236 dearray2\u6210\u4e3aarray1\u7684\u5f15\u7528\u3002
                                                            \n\u5982\u679c\u66f4\u6539array2\u7684\u5143\u7d20\uff0c\u4e5f\u4f1a\u5f71\u54cd\u5230array1\u3002
                                                            \n\u53cd\u4e4b\u4ea6\u7136\u3002<\/p>\n
                                                            int<\/span>[]<\/span> array1<\/span> =<\/span> {<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>};<\/span>\r\nint<\/span>[]<\/span> array2<\/span> =<\/span> array1<\/span>;<\/span>\r\n\r\n<\/code><\/pre>\n
                                                            \u5982\u679c\u4f7f\u7528clone\u65b9\u6cd5\uff0c\u53ef\u4ee5\u590d\u5236\u503c\u3002
                                                            \n\u96c6\u5408\u4e5f\u662f\u5982\u6b64\u3002
                                                            \njava
                                                            \nint[] array2 = array1.clone();<\/p>\n
                                                            \u6d45\u5c42\u590d\u5236\uff0c\u6df1\u5c42\u590d\u5236\u5728\u514b\u9686\u65b9\u6cd5\u4e2d\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e0d\u8db3\u7684\u60c5\u51b5\u3002
                                                            \n\u5f53\u5143\u7d20\u4e0d\u662f\u57fa\u672c\u7c7b\u578b\uff0c\u800c\u662f\u5bf9\u8c61\u7c7b\u578b\u65f6\uff0c
                                                            \n\u5bf9\u8c61\u7c7b\u578b\u5e76\u4e0d\u662f\u503c\uff0c\u800c\u662f\u4ee5\u5f15\u7528\u4f5c\u4e3a\u5143\u7d20\uff0c\u6240\u4ee5\u4e0d\u4f1a\u590d\u5236\u5f15\u7528\u6307\u5411\u7684\u503c\u3002\u8fd9\u5c31\u662f\u6d45\u590d\u5236\u3002
                                                            \n\u8fd9\u6837\u505a\u4f1a\u5bfc\u81f4\u591a\u4e2a\u5bf9\u8c61\u5171\u4eab\u76f8\u540c\u7684\u503c\u3002
                                                            \n\u5c06\u5f15\u7528\u6307\u5411\u7684\u503c\u590d\u5236\u8fc7\u6765\u79f0\u4e3a\u6df1\u590d\u5236\u3002
                                                            \n\u5230\u5e95\u8981\u590d\u5236\u591a\u5c11\u53d6\u51b3\u4e8e\u7a0b\u5e8f\u672c\u8eab\u3002<\/p>\n
                                                            \u770b\u8d77\u6765\u5f88\u56f0\u96be\u3002\u3002<\/p>\n
                                                            \u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528”<>”\u7b26\u53f7\u6765\u6307\u5b9a\u5e76\u5f3a\u5236\u6570\u636e\u7c7b\u578b\u3002<\/p>\n
                                                            \u4f7f\u7528\u6cdb\u578b\u7684\u6a21\u5f0f\u3002\u53ea\u80fd\u63a5\u53d7\u5b57\u7b26\u4e32\u7c7b\u578b\u3002<\/p>\n
                                                            \r\nList<\/span><<\/span>String<\/span>><\/span> list<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>String<\/span>>();<\/span>\r\n<\/code><\/pre>\n
                                                            \u4e0d\u4f7f\u7528\u6cdb\u578b\u7684\u6a21\u5f0f\u5728Eclipse\u4e0a\u4f1a\u6709\u6ce8\u610f\u6d88\u606f\u51fa\u73b0\uff0c\u4f46\u662f\u53ef\u4ee5\u4f7f\u7528\u3002
                                                            \n\u7531\u4e8e\u4e0d\u9700\u8981\u6307\u5b9a\u6570\u636e\u7c7b\u578b\uff0c\u6240\u4ee5\u9664\u4e86\u539f\u59cb\u7c7b\u578b\u4e4b\u5916\uff0c\u4efb\u4f55\u7c7b\u578b\u90fd\u53ef\u4ee5\u4f20\u5165\u3002<\/p>\n
                                                            \r\nList<\/span> list<\/span> =<\/span> new<\/span> ArrayList<\/span>();<\/span>\r\n<\/code><\/pre>\n
                                                            \u6cdb\u578b\u7684\u597d\u5904 de<\/p>\n
                                                              \n
                                                            • \n
                                                                \u660e\u793a\u7684\u306a\u30ad\u30e3\u30b9\u30c8\u304c\u3044\u3089\u306a\u3044<\/ul>\n<\/li>\n<\/ul>\n
                                                                 <\/p>\n
                                                                  \n
                                                                • \n
                                                                    \u30ad\u30e3\u30b9\u30c8\u306f\u51e6\u7406\u3092\u9045\u304f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b<\/ul>\n<\/li>\n<\/ul>\n
                                                                     <\/p>\n
                                                                      \u3069\u3093\u306a\u30c7\u30fc\u30bf\u304c\u5165\u308b\u304b\u308f\u304b\u308a\u3084\u3059\u3044<\/ul>\n
                                                                      List<\/span> list<\/span> =<\/span> new<\/span> ArrayList<\/span>();<\/span>\r\nList<\/span><<\/span>String<\/span>><\/span> list2<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>String<\/span>>();<\/span>\r\n\r\n\/\/ \u30ad\u30e3\u30b9\u30c8\u304c\u8907\u96d1<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(((<\/span>String<\/span>)<\/span> list<\/span>.<\/span>get<\/span>(<\/span>0<\/span>)).<\/span>length<\/span>());<\/span>\r\n\/\/ \u666e\u901a\u306eString\u578b\u3068\u540c\u3058\u3088\u3046\u306b\u4f7f\u3048\u308b<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>list2<\/span>.<\/span>get<\/span>(<\/span>0<\/span>).<\/span>length<\/span>());<\/span>\r\n<\/code><\/pre>\n
                                                                      \u786e\u5b9e\uff0c\u7528\u6cdb\u578b\u53ef\u80fd\u4f1a\u66f4\u5bb9\u6613\u4e00\u4e9b\u3002
                                                                      \n\u4e0d\u8fc7\uff0cEclipse\u5f88\u51fa\u8272\u3002<\/p>\n
                                                                      \u6570\u7ec4<\/p>\n
                                                                      \u6570\u7ec4\u7684\u5143\u7d20\u4e2a\u6570<\/p>\n
                                                                      \u914d\u5217\u540d<\/span>.<\/span>length<\/span>\r\n<\/code><\/pre>\n
                                                                      \u91cd\u590d\u5404\u79cd\u4e0d\u540c\u7684\u4e1c\u897f<\/p>\n
                                                                      \u6700\u57fa\u7840\u7684<\/p>\n
                                                                      public<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        int<\/span>[]<\/span> box<\/span> =<\/span> {<\/span>0<\/span>,<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>,<\/span>6<\/span>,<\/span>7<\/span>,<\/span>8<\/span>,<\/span>9<\/span>};<\/span>\r\n\r\n        for<\/span>(<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> 10<\/span>;<\/span> i<\/span>++)<\/span> {<\/span>\r\n            if<\/span>(<\/span>i<\/span> ==<\/span> 5<\/span>)<\/span> {<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>i<\/span>+<\/span>1<\/span>+<\/span>\":\"<\/span>+<\/span>box<\/span>[<\/span>i<\/span>]+<\/span>\"_continue\"<\/span>);<\/span>\r\n                continue<\/span>;<\/span>\r\n            }<\/span>else<\/span> if<\/span>(<\/span>i<\/span> ==<\/span> 7<\/span>)<\/span> {<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>i<\/span>+<\/span>1<\/span>+<\/span>\":\"<\/span>+<\/span>box<\/span>[<\/span>i<\/span>]+<\/span>\"_break\"<\/span>);<\/span>\r\n                break<\/span>;<\/span>\r\n            }<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>i<\/span>+<\/span>1<\/span>+<\/span>\":\"<\/span>+<\/span>box<\/span>[<\/span>i<\/span>]);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n\/\/\u7d50\u679c<\/span>\r\n1<\/span>:<\/span>0<\/span>\r\n2<\/span>:<\/span>1<\/span>\r\n3<\/span>:<\/span>2<\/span>\r\n4<\/span>:<\/span>3<\/span>\r\n5<\/span>:<\/span>4<\/span>\r\n6<\/span>:<\/span>5<\/span>_continue<\/span>\r\n7<\/span>:<\/span>6<\/span>\r\n8<\/span>:<\/span>7<\/span>_break<\/span>\r\n<\/code><\/pre>\n
                                                                      public<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        int<\/span>[]<\/span> box<\/span> =<\/span> {<\/span>0<\/span>,<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>,<\/span>6<\/span>,<\/span>7<\/span>,<\/span>8<\/span>,<\/span>9<\/span>};<\/span>\r\n        int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span>\r\n        while<\/span>(<\/span>i<\/span> <<\/span> 10<\/span>)<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>i<\/span>+<\/span>1<\/span>+<\/span>\":\"<\/span>+<\/span>box<\/span>[<\/span>i<\/span>]);<\/span>\r\n            i<\/span>++;<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\npublic<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        int<\/span>[]<\/span> box<\/span> =<\/span> {<\/span>0<\/span>,<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>4<\/span>,<\/span>5<\/span>,<\/span>6<\/span>,<\/span>7<\/span>,<\/span>8<\/span>,<\/span>9<\/span>};<\/span>\r\n        int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span>\r\n        do<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>i<\/span>+<\/span>1<\/span>+<\/span>\":\"<\/span>+<\/span>box<\/span>[<\/span>i<\/span>]);<\/span>\r\n            i<\/span>++;<\/span>\r\n        }<\/span>while<\/span>(<\/span>i<\/span> <<\/span> 10<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                      \u4e45\u3057\u3076\u308a\u306bdo~while\u3092\u898b\u305f\u306a\u30fb\u30fb
                                                                      \n\u5f53\u589e\u52a0\u4e86\u4e0b\u6807\u65f6\uff0c\u540d\u5b57\u7684\u5e93\u5b58\u5c31\u4f1a\u51cf\u5c11\u3002\u3002<\/p>\n
                                                                      \u6269\u5c55for\u5faa\u73af<\/p>\n
                                                                      import<\/span> java.util.HashSet<\/span>;<\/span>\r\nimport<\/span> java.util.Set<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        \/\/ \u5024\u306e\u91cd\u8907\u3092\u8a31\u3055\u306a\u3044<\/span>\r\n        \/\/ \u9806\u5e8f\u306e\u4fdd\u8a3c\u3082\u306a\u3044<\/span>\r\n        Set<\/span><<\/span>String<\/span>><\/span> hs<\/span> =<\/span> new<\/span> HashSet<\/span><<\/span>String<\/span>>();<\/span>\r\n        hs<\/span>.<\/span>add<\/span>(<\/span>\"\u767d\"<\/span>);<\/span>\r\n        hs<\/span>.<\/span>add<\/span>(<\/span>\"\u8d64\"<\/span>);<\/span>\r\n        hs<\/span>.<\/span>add<\/span>(<\/span>\"\u767d\"<\/span>);<\/span>\r\n        hs<\/span>.<\/span>add<\/span>(<\/span>\"\u7dd1\"<\/span>);<\/span>\r\n\r\n        int<\/span>[]<\/span> array<\/span> =<\/span> {<\/span>1<\/span>,<\/span>2<\/span>,<\/span>3<\/span>,<\/span>1<\/span>};<\/span>\r\n\r\n        \/\/ HashSet\u306b\u306fget\u30e1\u30bd\u30c3\u30c9\u304c\u306a\u3044<\/span>\r\n\/\/        for(int i = 0; i < hs.size(); i++) {<\/span>\r\n\/\/            System.out.println(hs.(i));<\/span>\r\n\/\/        }<\/span>\r\n\r\n        \/\/ \u62e1\u5f35for \u6587<\/span>\r\n        for<\/span>(<\/span>String<\/span> item<\/span> :<\/span> hs<\/span>)<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>item<\/span>);<\/span>\r\n        }<\/span>\r\n\r\n        for<\/span>(<\/span>int<\/span> i<\/span> :<\/span> array<\/span>)<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>i<\/span>);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n\/\/\u7d50\u679c<\/span>\r\n\u7dd1<\/span>\r\n\u8d64<\/span>\r\n\u767d<\/span>\r\n1<\/span>\r\n2<\/span>\r\n3<\/span>\r\n1<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                      \u533f\u540d\u51fd\u6570\u592a\u96be\u4e86\u3002\u3002<\/p>\n
                                                                      \u5404\u79cd\u5404\u6837<\/p>\n
                                                                      \r\npublic<\/span> class<\/span> TestMain<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        List<\/span><<\/span>String<\/span>><\/span> cities<\/span> =<\/span> new<\/span> ArrayList<\/span><<\/span>String<\/span>>();<\/span>\r\n        cities<\/span>.<\/span>add<\/span>(<\/span>\"\u4eac\u90fd\"<\/span>);<\/span>\r\n        cities<\/span>.<\/span>add<\/span>(<\/span>\"\u5927\u962a\"<\/span>);<\/span>\r\n        cities<\/span>.<\/span>add<\/span>(<\/span>\"\u611b\u77e5\"<\/span>);<\/span>\r\n\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30eb\u30fc\u30d7\uff11\"<\/span>);<\/span>\r\n        for<\/span>(<\/span>int<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> cities<\/span>.<\/span>size<\/span>();<\/span> i<\/span>++)<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>cities<\/span>.<\/span>get<\/span>(<\/span>i<\/span>));<\/span>\r\n        }<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30eb\u30fc\u30d7\uff12\"<\/span>);<\/span>\r\n        for<\/span>(<\/span>Iterator<\/span><<\/span>String<\/span>><\/span> ite<\/span> =<\/span> cities<\/span>.<\/span>iterator<\/span>();<\/span> ite<\/span>.<\/span>hasNext<\/span>();)<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>ite<\/span>.<\/span>next<\/span>());<\/span>\r\n        }<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30eb\u30fc\u30d7\uff13\uff1a\u62e1\u5f35for\u30eb\u30fc\u30d7\"<\/span>);<\/span>\r\n        for<\/span>(<\/span>String<\/span> city<\/span> :<\/span> cities<\/span>)<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>city<\/span>);<\/span>\r\n        }<\/span>\r\n\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30eb\u30fc\u30d7\uff14\uff1a\"<\/span>);<\/span>\r\n        cities<\/span>.<\/span>forEach<\/span>(<\/span>new<\/span> Consumer<\/span><<\/span>String<\/span>>()<\/span> {<\/span>\r\n            public<\/span> void<\/span> accept<\/span>(<\/span>final<\/span> String<\/span> citiy<\/span>)<\/span> {<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>citiy<\/span>);<\/span>\r\n            }<\/span>\r\n        });<\/span>\r\n\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30eb\u30fc\u30d7\uff15\uff1a\u30e9\u30e0\u30c0\u5f0f\"<\/span>);<\/span>\r\n        cities<\/span>.<\/span>forEach<\/span>((<\/span>final<\/span> String<\/span> city<\/span>)<\/span> -><\/span> System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>city<\/span>));<\/span>\r\n\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30eb\u30fc\u30d7\uff16\uff1a\u30e9\u30e0\u30c0\u5f0f\"<\/span>);<\/span>\r\n        cities<\/span>.<\/span>forEach<\/span>(<\/span>System<\/span>.<\/span>out<\/span>::<\/span>println<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                      \u5730\u56fe<\/p>\n
                                                                      \u952e\u503c\u5bf9\u7684\u5faa\u73af\u5217\u8868<\/p>\n
                                                                      import<\/span> java.util.HashMap<\/span>;<\/span>\r\nimport<\/span> java.util.Map<\/span>;<\/span>\r\npublic<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n\r\n        Map<\/span><<\/span>String<\/span>,<\/span> String<\/span>><\/span> map<\/span> =<\/span> new<\/span> HashMap<\/span><<\/span>String<\/span>,<\/span> String<\/span>>(){<\/span>\r\n            {<\/span>\r\n                put<\/span>(<\/span>\"001\"<\/span>,<\/span>\"\u8d64\"<\/span>);<\/span>\r\n                put<\/span>(<\/span>\"002\"<\/span>,<\/span>\"\u9752\"<\/span>);<\/span>\r\n                put<\/span>(<\/span>\"003\"<\/span>,<\/span>\"\u7dd1\"<\/span>);<\/span>\r\n            }<\/span>\r\n        };<\/span>\r\n\r\n        \/\/ \u5024<\/span>\r\n        for<\/span>(<\/span>String<\/span> item<\/span> :<\/span> map<\/span>.<\/span>values<\/span>())<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>item<\/span>);<\/span>\r\n        }<\/span>\r\n\r\n        \/\/ \u30ad\u30fc<\/span>\r\n        for<\/span>(<\/span>String<\/span> item<\/span> :<\/span> map<\/span>.<\/span>keySet<\/span>())<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>item<\/span>);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                                                      \u9ed8\u8ba4\u7f16\u7801<\/p>\n
                                                                      \u5728\u4f7f\u7528javac\u8fdb\u884c\u7f16\u8bd1\u65f6
                                                                      \n\u7528Sakura\u7f16\u8f91\u5668\u6216\u8005\u8bb0\u4e8b\u672c\u968f\u4fbf\u5199\u5199\u6e90\u4ee3\u7801\u3002<\/p>\n
                                                                      javac<\/span> hoge<\/span>.<\/span>java<\/span>\r\n<\/code><\/pre>\n
                                                                      \u4ee5\u524d\u4ece\u672a\u5bdf\u89c9\uff0c\u53ea\u662f\u8f7b\u677e\u5730\u5728Eclipse\u4e0a\u70b9\u51fb\u6309\u94ae\u8fdb\u884c\u7f16\u8bd1\u548c\u8fd0\u884c\u800c\u5df2\u3002
                                                                      \n\u5f53\u6211\u5c1d\u8bd5\u5728DOS\u4e0a\u624b\u52a8\u7f16\u8bd1\u4e4b\u524d\uff0c\u6211\u6ca1\u6709\u610f\u8bc6\u5230\u5728Eclipse\u4e0a\u521b\u5efa\u7684\u6e90\u4ee3\u7801\u3002<\/p>\n
                                                                      \r\n\/\/\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9<\/span>\r\npublic<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u307b\u3052\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n\/\/\u7d50\u679c<\/span>\r\nC:<\/span>\\<\/span>MyWork<\/span>\\<\/span>><\/span>javac<\/span> SampleProgram<\/span>.<\/span>java<\/span>\r\nSampleProgram<\/span>.<\/span>java<\/span>:<\/span>6<\/span>:<\/span> \u30a8\u30e9\u30fc:<\/span> \u3053\u306e\u6587\u5b57\u306f<\/span>\u3001<\/span>\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0MS932\u306b\u30de\u30c3\u30d7\u3067\u304d\u307e\u305b\u3093<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u7e3a\uff7b\u7e3a?\"<\/span>);<\/span>\r\n                               ^<\/span>\r\n\u30a8\u30e9\u30fc1\u500b<\/span>\r\n\r\nC:<\/span>\\<\/span>MyWork<\/span>\\<\/span>><\/span>\r\n<\/code><\/pre>\n
                                                                      \u5728\u4f7f\u7528javac\u8fdb\u884c\u7f16\u8bd1\u65f6\uff0c\u5982\u679c\u4e0d\u6307\u5b9a\u7f16\u7801\uff0c\u5b83\u5c06\u4f7f\u7528JVM\uff08\uff1f\uff09\u7684\u9ed8\u8ba4\u7f16\u7801\u8fdb\u884c\u7f16\u8bd1\u3002\u5728Windows\u73af\u5883\u4e0b\uff0c\u5982\u679c\u6587\u4ef6\u7684\u7f16\u7801\u662f”UTF-8″\uff0c\u90a3\u4e48\u5c31\u4f1a\u51fa\u73b0\u4e0eWindows\u9ed8\u8ba4\u7f16\u7801”MS932″\u4e0d\u5339\u914d\u7684\u60c5\u51b5\u3002<\/p>\n
                                                                      javac -encoding utf8 SampleProgram.java\r\n<\/code><\/pre>\n
                                                                      \u5982\u679c\u8fd9\u6837\u505a\u7684\u8bdd\uff0c\u5c31\u80fd\u6210\u529f\u7f16\u8bd1\u3002 (If you do it this way, you can successfully compile.)<\/p>\n
                                                                      \u67e5\u770b\u9ed8\u8ba4\u7f16\u7801\u7684\u65b9\u6cd5<\/p>\n
                                                                      import<\/span> java.util.Properties<\/span>;<\/span>\r\nimport<\/span> java.util.Enumeration<\/span>;<\/span>\r\n\r\nclass<\/span> sampleEncoding<\/span>{<\/span>\r\n  public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span> args<\/span>[]){<\/span>\r\n    System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>System<\/span>.<\/span>getProperty<\/span>(<\/span>\"file.encoding\"<\/span>));<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                      \u66f4\u6539\u9ed8\u8ba4\u7f16\u7801\u3002\u5728Java\u7a0b\u5e8f\u4e2d\uff0c\u4f3c\u4e4e\u9ed8\u8ba4\u7f16\u7801\u5bf9\u8f93\u5165\u8f93\u51fa\u4e5f\u6709\u5f71\u54cd\u3002
                                                                      \n\u5f53\u8bfb\u53d6\u6587\u4ef6\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u6307\u5b9a\u6587\u4ef6\u7684\u7f16\u7801\uff0c
                                                                      \n\u5c31\u4f1a\u4f7f\u7528\u9ed8\u8ba4\u7f16\u7801\u3002\u5728\u9ed8\u8ba4\u7f16\u7801\u4e3a\u201cutf8\u201d\u7684\u73af\u5883\u4e0b\uff0c
                                                                      \n\u5982\u679c\u8981\u8bfb\u53d6\u7684\u6587\u4ef6\u4e3a\u201ceuc\u201d\u7f16\u7801\uff0c\u5982\u679c\u4e0d\u6307\u5b9a\u7f16\u7801\uff0c
                                                                      \n\u4f1a\u5bfc\u81f4\u4e71\u7801\u3002<\/p>\n
                                                                      \u5982\u679c\u4e8b\u5148\u66f4\u6539\u9ed8\u8ba4\u7f16\u7801\uff0c\u5373\u4f7f\u4e0d\u4fee\u6539\u6e90\u4ee3\u7801\u6216\u8f93\u5165\u6587\u4ef6\uff0c\u4e5f\u53ef\u4ee5\u907f\u514d\u4e71\u7801\u95ee\u9898\uff0c\u5e76\u80fd\u591f\u8fdb\u884c\u7f16\u8bd1\u3002<\/p>\n
                                                                      REM windows\u306e\u5834\u5408\r\nset JAVA_TOOL_OPTIONS=-Dfile.encoding=UTF8\r\n\r\n\r\nC:\\MyWork>javac SampleProgram.java\r\nSampleProgram.java:6: \u30a8\u30e9\u30fc: \u3053\u306e\u6587\u5b57\u306f\u3001\u30a8\u30f3\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0MS932\u306b\u30de\u30c3\u30d7\u3067\u304d\u307e\u305b\u3093\r\n        System.out.println(\"\u7e3a\uff7b\u7e3a?\");\r\n                               ^\r\n\u30a8\u30e9\u30fc1\u500b\r\n\r\nC:\\MyWork>set JAVA_TOOL_OPTIONS=-Dfile.encoding=UTF8\r\n\r\nC:\\MyWork>javac SampleProgram.java\r\nPicked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8\r\n\r\nC:\\MyWork>\r\n<\/code><\/pre>\n
                                                                      \u91d1\u94b1\u8ba1\u7b97\u65f6\u4e0d\u8981\u4f7f\u7528float\u6216double\u3002
                                                                      \n\u636e\u8bf4\uff0c\u5f53\u5728\u5185\u90e8\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u5e76\u8fdb\u884c\u8ba1\u7b97\u65f6\uff0c\u4f1a\u4ea7\u751f\u8bef\u5dee\u3002<\/p>\n
                                                                      \u542c\u8bf4\u8981\u4f7f\u7528BigDecimal\u7c7b\u3002
                                                                      \n\u542c\u8bf4\u8981\u8fdb\u884c\u8ba1\u7b97\u800c\u4e0d\u662f\u8f6c\u6362\u6210\u4e8c\u8fdb\u5236\u3002<\/p>\n
                                                                      import<\/span> java.math.BigDecimal<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        double<\/span> xx<\/span> =<\/span> 1.0<\/span>;<\/span>\r\n        double<\/span> yy<\/span> =<\/span> 0.9<\/span>;<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>xx<\/span> -<\/span> yy<\/span>);<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>xx<\/span> \/<\/span> yy<\/span>);<\/span>\r\n\r\n        BigDecimal<\/span> x<\/span> =<\/span> new<\/span> BigDecimal<\/span>(<\/span>\"1.0\"<\/span>);<\/span>\r\n        BigDecimal<\/span> y<\/span> =<\/span> new<\/span> BigDecimal<\/span>(<\/span>\"0.9\"<\/span>);<\/span>\r\n\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>x<\/span>.<\/span>subtract<\/span>(<\/span>y<\/span>));<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>x<\/span>.<\/span>divide<\/span>(<\/span>y<\/span>,<\/span> 2<\/span>,<\/span> BigDecimal<\/span>.<\/span>ROUND_UP<\/span>));<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>x<\/span>.<\/span>divide<\/span>(<\/span>y<\/span>,<\/span> 2<\/span>,<\/span> BigDecimal<\/span>.<\/span>ROUND_DOWN<\/span>));<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>x<\/span>.<\/span>divide<\/span>(<\/span>y<\/span>,<\/span> 2<\/span>,<\/span> BigDecimal<\/span>.<\/span>ROUND_HALF_UP<\/span>));<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>x<\/span>.<\/span>divide<\/span>(<\/span>y<\/span>,<\/span> 3<\/span>,<\/span> BigDecimal<\/span>.<\/span>ROUND_HALF_DOWN<\/span>));<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>x<\/span>.<\/span>divide<\/span>(<\/span>y<\/span>,<\/span> 2<\/span>,<\/span> BigDecimal<\/span>.<\/span>ROUND_HALF_UP<\/span>));<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>x<\/span>.<\/span>divide<\/span>(<\/span>y<\/span>,<\/span> 3<\/span>,<\/span> BigDecimal<\/span>.<\/span>ROUND_HALF_DOWN<\/span>));<\/span>\r\n    }<\/span>\r\n\r\n}<\/span>\r\n\r\n\r\n\/\/\u7d50\u679c<\/span>\r\n0.09999999999999998<\/span>\r\n1.1111111111111112<\/span>\r\n0.1<\/span>\r\n1.12<\/span>\r\n1.11<\/span>\r\n1.11<\/span>\r\n1.111<\/span>\r\n1.11<\/span>\r\n1.111<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                      \u5927\u6570.ROUND_HALF_UP\u548c\u5927\u6570.ROUND_HALF_DOWN\u6709\u4ec0\u4e48\u533a\u522b\u5462\uff1f
                                                                      \n\u6536\u5230\u8bc4\u8bba\u540e\uff0c\u6211\u91cd\u65b0\u8c03\u67e5\u4e86\u4e00\u4e0b\u3002
                                                                      \n\u5927\u6570.ROUND_HALF_UP\u662f\u56db\u820d\u4e94\u5165
                                                                      \n\u5927\u6570.ROUND_HALF_DOWN\u662f\u4e94\u820d\u516d\u5165
                                                                      \n\u771f\u662f\u5b8c\u5168\u4e0d\u540c\u5462\u3002\u3002\u3002<\/p>\n
                                                                      import<\/span> java.math.BigDecimal<\/span>;<\/span>\r\nimport<\/span> java.text.DecimalFormat<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n\r\n        DecimalFormat<\/span> format<\/span> =<\/span> new<\/span> DecimalFormat<\/span>(<\/span>\"#.#\"<\/span>);<\/span>\r\n        BigDecimal<\/span> x<\/span> =<\/span> new<\/span> BigDecimal<\/span>(<\/span>\"10.55\"<\/span>);<\/span>\r\n\r\n\r\n\r\n        BigDecimal<\/span> xx<\/span> =<\/span> x<\/span>.<\/span>setScale<\/span>(<\/span>1<\/span>,<\/span> BigDecimal<\/span>.<\/span>ROUND_HALF_UP<\/span>);<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u5c0f\u6570\u7b2c\uff12\u4f4d\u3067\u56db\u6368\u4e94\u5165 : \"<\/span> +<\/span> format<\/span>.<\/span>format<\/span>(<\/span>xx<\/span>));<\/span>\r\n\r\n        BigDecimal<\/span> xxx<\/span> =<\/span> x<\/span>.<\/span>setScale<\/span>(<\/span>1<\/span>,<\/span> BigDecimal<\/span>.<\/span>ROUND_HALF_DOWN<\/span>);<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u5c0f\u6570\u7b2c\uff12\u4f4d\u3067\u4e94\u6368\u516d\u5165 : \"<\/span> +<\/span> format<\/span>.<\/span>format<\/span>(<\/span>xxx<\/span>));<\/span>\r\n\r\n    }<\/span>\r\n\r\n}<\/span>\r\n\r\n\/\/\u7d50\u679c<\/span>\r\n\u5c0f\u6570\u7b2c\uff12\u4f4d\u3067\u56db\u6368\u4e94\u5165<\/span> :<\/span> 10.6<\/span>\r\n\u5c0f\u6570\u7b2c\uff12\u4f4d\u3067\u4e94\u6368\u516d\u5165<\/span> :<\/span> 10.5<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                      \u987a\u4fbf\u4e00\u63d0\uff0c\u5982\u679c\u53ea\u6307\u5b9a\u4e86\u9664\u6570\uff0c\u4ee5\u4e0b\u5f02\u5e38\u60c5\u51b5\u53ef\u80fd\u4f1a\u53d1\u751f……\u4f3c\u4e4e\u662f\u56e0\u4e3a\u8ba1\u7b97\u7ed3\u679c\u4f1a\u53d8\u6210\u5faa\u73af\u5c0f\u6570\u3002<\/p>\n
                                                                      System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>x<\/span>.<\/span>divide<\/span>(<\/span>y<\/span>));<\/span>\r\n\r\n\/\/\u4f8b\u5916<\/span>\r\nException<\/span> in<\/span> thread<\/span> \"main\"<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>ArithmeticException<\/span>:<\/span> Non<\/span>-<\/span>terminating<\/span> decimal<\/span> expansion<\/span>;<\/span> no<\/span> exact<\/span> representable<\/span> decimal<\/span> result<\/span>.<\/span>\r\n    at<\/span> java<\/span>.<\/span>math<\/span>.<\/span>BigDecimal<\/span>.<\/span>divide<\/span>(<\/span>BigDecimal<\/span>.<\/span>java<\/span>:<\/span>1690<\/span>)<\/span>\r\n    at<\/span> SampleProgram<\/span>.<\/span>main<\/span>(<\/span>SampleProgram<\/span>.<\/span>java<\/span>:<\/span>15<\/span>)<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                      \u5728\u6570\u5b57\u6e90\u4e0a\u7684\u5916\u89c2
                                                                      \n\u53ef\u4ee5\u4f7f\u7528\u300c_\u300d\u8fdb\u884c\u5206\u9694\u3002
                                                                      \n\u663e\u793a\u7ed3\u679c\u4e0d\u4f1a\u5bf9\u8ba1\u7b97\u4ea7\u751f\u5f71\u54cd\u3002\u55ef…\u4e5f\u8bb8\u5bf9\u4e8e\u5e38\u91cf\u5b9a\u4e49\u5f88\u65b9\u4fbf\uff1f<\/p>\n
                                                                      int<\/span> x<\/span> =<\/span> 1_000<\/span>;<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                      \u6211\u60f3\u8981\u5c07\u5b83\u8ce6\u503c\u7d66\u4e0d\u540c\u7684\u985e\u578b\u3002<\/p>\n
                                                                      \u53ea\u80fd\u4f7f\u7528\u5177\u6709\u4e92\u901a\u6027\u7684\u6f14\u5458\u9635\u5bb9\u3002<\/p>\n
                                                                      int<\/span> x<\/span> =<\/span> 12<\/span>;<\/span>\r\nint<\/span> y<\/span> =<\/span> 5<\/span>;<\/span>\r\ndouble<\/span> ans<\/span> =<\/span> (<\/span>double<\/span>)<\/span>x<\/span> \/<\/span> (<\/span>double<\/span>)<\/span>y<\/span>;<\/span>\r\n<\/code><\/pre>\n
                                                                      \u76f8\u5173\u7684\u4e8b\u7269<\/p>\n
                                                                        \n
                                                                      • \n
                                                                          \u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u540c\u58eb<\/ul>\n<\/li>\n<\/ul>\n
                                                                           <\/p>\n
                                                                            \n
                                                                          • \n
                                                                              \u30af\u30e9\u30b9\u306e\u7d99\u627f\u5143\u304c\u540c\u3058<\/ul>\n<\/li>\n<\/ul>\n
                                                                               <\/p>\n
                                                                                \u540c\u3058\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b<\/ul>\n
                                                                                \u7136\u800c\uff0c\u5e0c\u671b\u5c06\u6570\u5b57\u8f6c\u6362\u4e3a\u5b57\u7b26\u3002\u4f7f\u7528String.valueOf\u65b9\u6cd5
                                                                                \n\u7528\u6cd5\u4e3a\uff0c
                                                                                \n\u7c7b\u540d.\u65b9\u6cd5\u540d<\/p>\n
                                                                                int<\/span> x<\/span> =<\/span> 1234<\/span>;<\/span>\r\nString<\/span> ss<\/span> =<\/span> String<\/span>.<\/span>valueOf<\/span>(<\/span>x<\/span>);<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                                \u7531\u4e8e\u5b57\u7b26\u4e32\u7c7b\u578b, \u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528length\u65b9\u6cd5\u3002<\/p>\n
                                                                                public<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        int<\/span> x<\/span>;<\/span>\r\n        x<\/span> =<\/span> 123<\/span> *<\/span> 234<\/span>;<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>String<\/span>.<\/span>valueOf<\/span>(<\/span>x<\/span>).<\/span>length<\/span>());<\/span>\r\n    }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
                                                                                \u5bf9\u4e8e\u7c7b\u8fdb\u884c\u65b9\u6cd5\u8c03\u7528<\/p>\n
                                                                                  \n
                                                                                • \n
                                                                                    \u9759\u7684\u30e1\u30bd\u30c3\u30c9<\/ul>\n<\/li>\n<\/ul>\n
                                                                                     <\/p>\n
                                                                                      \n
                                                                                    • \n
                                                                                        static\u30e1\u30bd\u30c3\u30c9<\/ul>\n<\/li>\n<\/ul>\n
                                                                                         <\/p>\n
                                                                                          \u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9<\/ul>\n
                                                                                          \u9019\u610f\u5473\u8457\u5c0d\u65bc\u5c0d\u8c61\uff08\u8b8a\u91cf\uff09\u8abf\u7528\u7684\u65b9\u6cd5\u88ab\u7a31\u70ba\u5be6\u4f8b\u65b9\u6cd5\u3002<\/p>\n
                                                                                          \u5224\u65ad\u7684\u65b9\u6cd5\u662f\u770b\u662f\u5426\u5b58\u5728\u201cstatic\u201d\u3002<\/p>\n
                                                                                          \u60f3\u628a\u6587\u672c\u8f6c\u6362\u6210\u6570\u5b57\u3002\u4f7f\u7528\u5305\u88c5\u7c7b\u5c06\u539f\u59cb\u7c7b\u578b\u8f6c\u6362\u4e3a\u5bf9\u8c61\u3002<\/p>\n
                                                                                          \n
                                                                                          \u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9booleanBooleancharCharacterbyteByteshortShortintIntegerlongLongfloatFloatdoubleDouble<\/p>\n
                                                                                          import<\/span> java.io.IOException<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> IOException<\/span> {<\/span>\r\n       String<\/span> x<\/span> =<\/span> \"123\"<\/span>;<\/span>\r\n       String<\/span> xx<\/span> =<\/span> \"12.45\"<\/span>;<\/span>\r\n       int<\/span> y<\/span>;<\/span>\r\n       double<\/span> yy<\/span>;<\/span>\r\n\r\n       \/\/ String\u578b\u3078\u3001\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306f\u4ee3\u5165\u3067\u304d\u306a\u3044<\/span>\r\n       \/\/y = x;<\/span>\r\n\r\n       y<\/span> =<\/span> Integer<\/span>.<\/span>valueOf<\/span>(<\/span>x<\/span>);<\/span>\r\n       System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>y<\/span>);<\/span>\r\n       yy<\/span> =<\/span> Double<\/span>.<\/span>valueOf<\/span>(<\/span>xx<\/span>);<\/span>\r\n       System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>yy<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\/\/\u7d50\u679c<\/span>\r\n123<\/span>\r\n12.45<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                                          \u603b\u7ed3<\/p>\n
                                                                                            \n
                                                                                          • \n
                                                                                              \u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u540c\u58eb\u306f\u3001\u30ad\u30e3\u30b9\u30c8\u3067\u5bfe\u5fdc\uff08ex. (double)i \/ (double)ii\uff09<\/ul>\n<\/li>\n<\/ul>\n
                                                                                               <\/p>\n
                                                                                                \n
                                                                                              • \n
                                                                                                  String\u578b\u2192\u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u306f\u3001String\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u5bfe\u5fdc<\/ul>\n<\/li>\n<\/ul>\n
                                                                                                   <\/p>\n
                                                                                                    \u30d7\u30ea\u30df\u30c6\u30a3\u30d6\u578b\u2192String\u578b\u306f\u3001\u30e9\u30c3\u30d1\u30fc\u30af\u30e9\u30b9\u3067\u5bfe\u5fdc<\/ul>\n
                                                                                                    \u6587\u4ef6\u7684\u8f93\u5165\u8f93\u51fa<\/p>\n
                                                                                                    \u8f93\u51651
                                                                                                    \n\u7531\u4e8e\u53ea\u5199close()\u4f1a\u5bfc\u81f4”\u672a\u5904\u7406\u7684\u5f02\u5e38\u7c7b\u578bIOException”\u9519\u8bef\uff0c\u6240\u4ee5\u6211\u6dfb\u52a0\u4e86\u629b\u51fa\u58f0\u660e\u3002(\u771f\u6ca1\u60f3\u52302021\u5e74\u8fd8\u6709\u4f7f\u7528Java 1.6\u7684\u9879\u76ee\u5b58\u5728…)<\/p>\n
                                                                                                    package<\/span> prototype.test.readfile<\/span>;<\/span>\r\n\r\nimport<\/span> java.io.BufferedReader<\/span>;<\/span>\r\nimport<\/span> java.io.File<\/span>;<\/span>\r\nimport<\/span> java.io.FileNotFoundException<\/span>;<\/span>\r\nimport<\/span> java.io.FileReader<\/span>;<\/span>\r\nimport<\/span> java.io.IOException<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> IOException<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"Start.......\"<\/span>);<\/span>\r\n        \/\/ File\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u6587\u5b57\u5217\u304c\u66f8\u304d\u8fbc\u307e\u308c\u3066\u3044\u308b\u30d5\u30a1\u30a4\u30eb\u3092\u8868\u3059<\/span>\r\n        String<\/span> filePath<\/span> =<\/span> \"C:\\\\MyWork\\\\work\\\\eclipse-workspace\\\\file\\\\input.txt\"<\/span>;<\/span>\r\n        File<\/span> file<\/span> =<\/span> new<\/span> File<\/span>(<\/span>filePath<\/span>);<\/span>\r\n        BufferedReader<\/span> br<\/span> =<\/span>null<\/span>;<\/span>\r\n        try<\/span> {<\/span>\r\n            \/\/ File\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u6587\u5b57\u5217\u3092\u53d7\u3051\u53d6\u308b<\/span>\r\n            FileReader<\/span> fr<\/span> =<\/span> new<\/span> FileReader<\/span>(<\/span>file<\/span>);<\/span>\r\n            \/\/ \u53d7\u3051\u53d6\u3063\u305f\u6587\u5b57\u5217\u3092\u84c4\u3048\u3066\u304a\u304d\u3001\u8981\u6c42\u306b\u5fdc\u3058\u3066\u6587\u5b57\u5217\u3092\u6e21\u3059<\/span>\r\n            br<\/span> =<\/span> new<\/span> BufferedReader<\/span>(<\/span>fr<\/span>);<\/span>\r\n            String<\/span> line<\/span> =<\/span> null<\/span>;<\/span>\r\n            while<\/span>((<\/span>line<\/span> =<\/span> br<\/span>.<\/span>readLine<\/span>())<\/span> !=<\/span> null<\/span>)<\/span> {<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>line<\/span>);<\/span>\r\n            }<\/span>\r\n        }<\/span> catch<\/span> (<\/span>FileNotFoundException<\/span> e<\/span>)<\/span> {<\/span>\r\n            \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span> catch<\/span> (<\/span>IOException<\/span> e<\/span>)<\/span> {<\/span>\r\n            \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f catch \u30d6\u30ed\u30c3\u30af<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span>finally<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"close!!\"<\/span>);<\/span>\r\n            br<\/span>.<\/span>close<\/span>();<\/span>\r\n        }<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"End.........\"<\/span>);<\/span>\r\n\r\n    }<\/span>\r\n}<\/span>\r\n\r\n\/\/\u7d50\u679c<\/span>\r\nStart<\/span>.......<\/span>\r\nTest<\/span> 1<\/span>\r\nTest<\/span> 2<\/span>\r\nclose<\/span>!!<\/span>\r\nEnd<\/span>.........<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                                                    2\u8f93\u5165
                                                                                                    \n\u5c06\u8f93\u51651\u7684tyr-catch\u8bed\u53e5\u8f6c\u6362\u4e3atry-with-resources\u8bed\u53e5\u3002<\/p>\n
                                                                                                    package<\/span> prototype.test.readfile<\/span>;<\/span>\r\n\r\nimport<\/span> java.io.BufferedReader<\/span>;<\/span>\r\nimport<\/span> java.io.File<\/span>;<\/span>\r\nimport<\/span> java.io.FileNotFoundException<\/span>;<\/span>\r\nimport<\/span> java.io.FileReader<\/span>;<\/span>\r\nimport<\/span> java.io.IOException<\/span>;<\/span>\r\n\r\n\/**\r\n * try-with-resources\u3092\u4f7f\u3063\u305f\u30d0\u30fc\u30b8\u30e7\u30f3\r\n * java1.7\u304b\u3089\u4ed5\u69d8\u53ef\u80fd\r\n *\r\n *\/<\/span>\r\npublic<\/span> class<\/span> Main2<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> IOException<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"Start.......\"<\/span>);<\/span>\r\n        String<\/span> filePath<\/span> =<\/span> \"C:\\\\MyWork\\\\work\\\\eclipse-workspace\\\\file\\\\input.txt\"<\/span>;<\/span>\r\n        File<\/span> file<\/span> =<\/span> new<\/span> File<\/span>(<\/span>filePath<\/span>);<\/span>\r\n\r\n        try<\/span>(<\/span>\r\n            \/\/\u30ea\u30bd\u30fc\u30b9\u306e\u5ba3\u8a00 \u3053\u3053\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u306b\u5bfe\u3057\u3066\u3001\u81ea\u52d5\u7684\u306bclose()\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3070\u308c\u308b<\/span>\r\n            FileReader<\/span> fr<\/span> =<\/span> new<\/span> FileReader<\/span>(<\/span>file<\/span>);<\/span>\r\n            BufferedReader<\/span>  br<\/span> =<\/span> new<\/span> BufferedReader<\/span>(<\/span>fr<\/span>);<\/span>\r\n            )<\/span>\r\n        {<\/span>\r\n            String<\/span> line<\/span> =<\/span> null<\/span>;<\/span>\r\n            while<\/span>((<\/span>line<\/span> =<\/span> br<\/span>.<\/span>readLine<\/span>())<\/span> !=<\/span> null<\/span>)<\/span> {<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>line<\/span>);<\/span>\r\n            }<\/span>\r\n        }<\/span>catch<\/span> (<\/span>Exception<\/span> e<\/span>)<\/span> {<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"End.........\"<\/span>);<\/span>\r\n\r\n    }<\/span>\r\n\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                                                    \u679a\u4e3e j\u01d4).<\/p>\n
                                                                                                    --<\/span>Const<\/span>.<\/span>java<\/span>\r\npackage<\/span> prototype.test.Const<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Const<\/span> {<\/span>\r\n    public<\/span> static<\/span> enum<\/span> PEN<\/span> {<\/span>\r\n        pencil<\/span>(<\/span>\"\u3048\u3093\u3074\u3064\"<\/span>),<\/span>\r\n        ballpoint_pen<\/span>(<\/span>\"\u30dc\u30fc\u30eb\u30da\u30f3\"<\/span>),<\/span>\r\n        fountain_pen<\/span>(<\/span>\"\u4e07\u5e74\u7b46\"<\/span>);<\/span>\r\n\r\n        private<\/span> String<\/span> name<\/span>;<\/span>\r\n\r\n        \/**\r\n         * \u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf \u5217\u6319\u578b\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u3092\u6291\u6b62\u3057\u307e\u3059\r\n         *\/<\/span>\r\n        private<\/span> PEN<\/span>(<\/span>String<\/span> name<\/span>)<\/span> {<\/span>\r\n            this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\r\n        }<\/span>\r\n\r\n        public<\/span> String<\/span> getValue<\/span>()<\/span> {<\/span>\r\n            return<\/span> this<\/span>.<\/span>name<\/span>;<\/span>\r\n        }<\/span>\r\n\r\n    }<\/span>\r\n}<\/span>\r\n--<\/span>Main2<\/span>.<\/span>java<\/span>\r\npackage<\/span> prototype.test.Const<\/span>;<\/span>\r\n\r\nimport<\/span> prototype.test.Const.Const.PEN<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> Main2<\/span> {<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        \/\/ TODO \u81ea\u52d5\u751f\u6210\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u30fb\u30b9\u30bf\u30d6<\/span>\r\n        String<\/span> pen<\/span> =<\/span> \"\u3048\u3093\u3074\u3064\"<\/span>;<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"pen[\"<\/span>+<\/span>pen<\/span>+<\/span>\"]\"<\/span>);<\/span>\r\n        if<\/span>(<\/span>PEN<\/span>.<\/span>pencil<\/span>.<\/span>getValue<\/span>().<\/span>equals<\/span>(<\/span>pen<\/span>))<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"OK\"<\/span>);<\/span>\r\n        }<\/span>else<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"NG\"<\/span>);<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                                                    \u5199\u6761\u4ef6\u7684\u65b9\u5f0f<\/p>\n
                                                                                                    \u5982\u679c\u5f53\u5f00\u59cb\u5b66\u4e60\u5404\u79cd\u8bed\u8a00\u65f6\uff0c\u5c31\u4f1a\u641e\u4e0d\u6e05\u695a\u5982\u4f55\u6b63\u786e\u4f7f\u7528\u201celse if\u201d\u7684\u5199\u6cd5\u3002<\/p>\n
                                                                                                    \u57fa\u672c\u5f62\u6001<\/p>\n
                                                                                                    if(\u6761\u4ef6\uff11) {\r\n\r\n}else if(\u6761\u4ef6\uff12) {\r\n\r\n}else {\r\n\r\n}\r\n<\/code><\/pre>\n
                                                                                                    \u6bd4\u8f83\u8fd0\u7b97\u7b26<\/p>\n
                                                                                                    \n
                                                                                                    \u6f14\u7b97\u5b50\u610f\u5473==\u7b49\u3057\u3044!=\u7570\u306a\u308b>->=-<-<=-<\/p>\n
                                                                                                    \u903b\u8f91\u8fd0\u7b97\u7b26 l\u01d0 q\u00ed)<\/p>\n
                                                                                                      \n
                                                                                                    • \n
                                                                                                        AND\uff1a&&<\/ul>\n<\/li>\n<\/ul>\n
                                                                                                         <\/p>\n
                                                                                                          \n
                                                                                                        • \n
                                                                                                            OR\uff1a||<\/ul>\n<\/li>\n<\/ul>\n
                                                                                                             <\/p>\n
                                                                                                              NOT\uff1a!<\/ul>\n
                                                                                                              \u300c==\u300d\u548c\u300cequals\u300d\u300c==\u300d\u5224\u65ad\u5bf9\u8c61\uff08\u5730\u5740\uff09\u662f\u5426\u76f8\u540c\uff0c\u800c\u5224\u65ad\u503c\u662f\u5426\u76f8\u540c\u53ef\u4ee5\u4f7f\u7528\u300cequals\u300d\u3002”equals”\u9002\u7528\u4e8e\u975e\u539f\u59cb\u7c7b\u578b\u3002<\/p>\n
                                                                                                              \u57fa\u672c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b\u7684\u533a\u522b\u5728\u4e8e\uff0c\u57fa\u672c\u7c7b\u578b\u5b58\u50a8\u7684\u662f\u503c\uff0c\u800c\u5f15\u7528\u7c7b\u578b\u5b58\u50a8\u7684\u662f\u5bf9\u8c61\u7684\u5730\u5740\u3002<\/p>\n
                                                                                                              \u6b63\u5219\u8868\u8fbe\u5f0f
                                                                                                              \n\u592a\u96be\u4e86\u3002\u3002<\/p>\n
                                                                                                              public class SampleProgram {\r\n\r\n    public static void main(String[] args)  {\r\n\r\n        String[] tell = {\"090-1234-1234\",\"1234-1234-1234\",\"090-O123-1234\"};\r\n        \/*\r\n         * 3\u6841\u306e\u6570\u5b57 - 4\u6841\u306e\u6570\u5b57 - 4\u6841\u306e\u6570\u5b57\r\n         *\/\r\n        for(int i = 0; i < tell.length; i++) {\r\n            System.out.println(tell[i]);\r\n            if(tell[i].matches(\"\\\\d{3}-\\\\d{4}-\\\\d{4}\")) {\r\n                System.out.println(\"\u6b63\u89e3\");\r\n            }else {\r\n                System.out.println(\"\u4e0d\u6b63\u89e3\");\r\n            }\r\n        }\r\n\r\n    }\r\n\r\n}\r\n\r\n\/\/\u7d50\u679c\r\n090-1234-1234\r\n\u6b63\u89e3\r\n1234-1234-1234\r\n\u4e0d\u6b63\u89e3\r\n090-O123-1234\r\n\u4e0d\u6b63\u89e3\r\n\r\n<\/code><\/pre>\n
                                                                                                              \u7279\u4f8b<\/p>\n
                                                                                                              \u57fa\u672c\u5f62\u6001\u6700\u540e\uff0c”finally” \u8fd9\u4e2a\u8bcd\u7528\u5f97\u4e0d\u592a\u591a\u5427\u3002\u3002<\/p>\n
                                                                                                              try{\r\n\r\n}catch(\u4f8b\u5916\u306e\u30af\u30e9\u30b9 \u5909\u6570\u540d){\r\n\r\n}finally{\r\n\r\n}\r\n<\/code><\/pre>\n
                                                                                                              \u5c06\u65b9\u6cd5\u629b\u51fa\u5230\u5916\u90e8\u5982\u679c\u5728\u65b9\u6cd5\u5185\u90e8\u53d1\u751f\u5f02\u5e38\uff0c\u53ef\u4ee5\u5c06\u5176\u629b\u5230\u65b9\u6cd5\u5916\uff0c\u800c\u4e0d\u5728\u540c\u4e00\u4e2a\u65b9\u6cd5\u5185\u6355\u83b7\u3002\u5fc5\u987b\u5728\u5916\u90e8\u6355\u83b7\u5f02\u5e38\u3002<\/p>\n
                                                                                                              \u623b\u308a\u5024 \u30e1\u30bd\u30c3\u30c9\u540d(\u5f15\u6570) throws \u4f8b\u5916\u306e\u578b {\r\n\r\n}\r\n<\/code><\/pre>\n
                                                                                                              \u6709\u6ca1\u6709try-with-resources\u8bed\u6cd5\u5462\uff1f\u542c\u8bf4\u662f\u4eceJava 7\u5f00\u59cb\u7684\u529f\u80fd\u3002\u73b0\u5728\u5148\u653e\u7740\u5427\u3002\u901a\u8fc7\u8bc4\u8bba\u5b66\u5230\u4e86\u7528\u6cd5\uff01\u53ef\u80fd\u5f88\u65b9\u4fbf\u3002<\/p>\n
                                                                                                              import<\/span> java.io.BufferedReader<\/span>;<\/span>\r\nimport<\/span> java.io.File<\/span>;<\/span>\r\nimport<\/span> java.io.FileReader<\/span>;<\/span>\r\nimport<\/span> java.io.IOException<\/span>;<\/span>\r\n\r\npublic<\/span> class<\/span> SampleProgram<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        String<\/span> fileName1<\/span> =<\/span>  \"C:\\\\test3.txt\"<\/span>;<\/span>\r\n        String<\/span> fileName2<\/span> =<\/span> \"C:\\\\test4.txt\"<\/span>;<\/span>\r\n\r\n        \/\/String fileName1 = null;<\/span>\r\n\r\n        try<\/span> (<\/span>\r\n                FileReader<\/span> fr<\/span> =<\/span> new<\/span> FileReader<\/span>(<\/span>new<\/span> File<\/span>(<\/span>fileName1<\/span>));<\/span>\r\n                BufferedReader<\/span> bfr<\/span> =<\/span> new<\/span> BufferedReader<\/span>(<\/span>fr<\/span>);<\/span>\r\n                FileReader<\/span> fr2<\/span> =<\/span> new<\/span> FileReader<\/span>(<\/span>new<\/span> File<\/span>(<\/span>fileName2<\/span>));<\/span>\r\n                BufferedReader<\/span> bfr2<\/span> =<\/span> new<\/span> BufferedReader<\/span>(<\/span>fr2<\/span>);<\/span>\r\n\r\n             )<\/span>\r\n        {<\/span>\r\n            String<\/span> ss<\/span> =<\/span> null<\/span>;<\/span>\r\n\r\n            while<\/span>((<\/span>ss<\/span> =<\/span> bfr<\/span>.<\/span>readLine<\/span>())<\/span> !=<\/span> null<\/span>)<\/span> {<\/span>\r\n                System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>ss<\/span> +<\/span> \"\u3092\u8aad\u307f\u8fbc\u307f\u307e\u3057\u305f\"<\/span>);<\/span>\r\n                \/\/throw new IOException();<\/span>\r\n            }<\/span>\r\n        }<\/span>catch<\/span>(<\/span>IOException<\/span> e<\/span>)<\/span> {<\/span>\r\n            e<\/span>.<\/span>printStackTrace<\/span>();<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
                                                                                                              \/\/\u57fa\u672c\u5f62\r\nimport java.io.BufferedReader;\r\nimport java.io.File;\r\nimport java.io.FileReader;\r\nimport java.io.IOException;\r\n\r\npublic class SampleProgram {\r\n\r\n    public static void main(String[] args)  {\r\n\r\n        try {\r\n            File file = new File(\"C:\\\\test3.txt\");\r\n            FileReader fr = new FileReader(file);\r\n            BufferedReader bfr = new BufferedReader(fr);\r\n            String ss = null;\r\n\r\n            while((ss = bfr.readLine()) != null) {\r\n                System.out.println(ss + \"\u3092\u8aad\u307f\u8fbc\u307f\u307e\u3057\u305f\");\r\n            }\r\n            bfr.close();\r\n\r\n        }catch(IOException e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n\r\n}\r\n\/\/\u7d50\u679c\r\njava.io.FileNotFoundException: C:\\test3.txt (\u6307\u5b9a\u3055\u308c\u305f\u30d5\u30a1\u30a4\u30eb\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3002)\r\n    at java.io.FileInputStream.open0(Native Method)\r\n    at java.io.FileInputStream.open(FileInputStream.java:195)\r\n    at java.io.FileInputStream.<init>(FileInputStream.java:138)\r\n    at java.io.FileReader.<init>(FileReader.java:72)\r\n    at SampleProgram.main(SampleProgram.java:12)\r\n\r\n\r\n\/\/\u4f8b\u5916\u3092\u5916\u3078\u6295\u3052\u308b\r\nimport java.io.BufferedReader;\r\nimport java.io.File;\r\nimport java.io.FileReader;\r\nimport java.io.IOException;\r\n\r\npublic class SampleProgram {\r\n\r\n    public static void main(String[] args) throws IOException {\r\n\r\n        File file = new File(\"C:\\\\test3.txt\");\r\n        FileReader fr = new FileReader(file);\r\n        BufferedReader bfr = new BufferedReader(fr);\r\n        String ss = null;\r\n\r\n        while((ss = bfr.readLine()) != null) {\r\n            System.out.println(ss + \"\u3092\u8aad\u307f\u8fbc\u307f\u307e\u3057\u305f\");\r\n        }\r\n        bfr.close();\r\n\r\n    }\r\n\r\n}\r\n\/\/\u7d50\u679c\r\nException in thread \"main\" java.io.FileNotFoundException: C:\\test3.txt (\u6307\u5b9a\u3055\u308c\u305f\u30d5\u30a1\u30a4\u30eb\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3002)\r\n    at java.io.FileInputStream.open0(Native Method)\r\n    at java.io.FileInputStream.open(FileInputStream.java:195)\r\n    at java.io.FileInputStream.<init>(FileInputStream.java:138)\r\n    at java.io.FileReader.<init>(FileReader.java:72)\r\n    at SampleProgram.main(SampleProgram.java:11)\r\n<\/code><\/pre>\n
                                                                                                              \u81ea\u5df1\u8bbe\u5b9a\u4f8b\u5916<\/p>\n
                                                                                                              \u4f7f\u7528\u73b0\u6709\u7684\u7c7b\u3002\u53ef\u4ee5\u901a\u8fc7throw\u8bed\u53e5\u629b\u51fa\u7684\u662f\u7ee7\u627f\u81eaThrowable\u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n
                                                                                                              import java.io.BufferedReader;\r\nimport java.io.File;\r\nimport java.io.FileReader;\r\nimport java.io.IOException;\r\n\r\npublic class SampleProgram {\r\n\r\n    public static void main(String[] args) throws IOException {\r\n\r\n        try {\r\n            File file = new File(\"C:\\\\test3.txt\");\r\n            FileReader fr = new FileReader(file);\r\n            BufferedReader bfr = new BufferedReader(fr);\r\n            String ss = null;\r\n\r\n            while((ss = bfr.readLine()) != null) {\r\n                System.out.println(ss + \"\u3092\u8aad\u307f\u8fbc\u307f\u307e\u3057\u305f\");\r\n            }\r\n            bfr.close();\r\n        }catch(IOException e) {\r\n            IOException ee = new IOException(\"IOException\u304c\u767a\u751f\uff01\uff01\");\r\n            throw ee;\r\n\r\n        }\r\n\r\n    }\r\n\r\n}\r\n\r\n\/\/\u7d50\u679c\r\nException in thread \"main\" java.io.IOException: IOException\u304c\u767a\u751f\uff01\uff01\r\n    at SampleProgram.main(SampleProgram.java:21)\r\n\r\n<\/code><\/pre>\n
                                                                                                              \u4eb2\u81ea\u5236\u4f5c\u5982\u679c\u8981\u521b\u5efa\u672a\u9884\u6599\u7684\u5f02\u5e38\uff0c\u53ef\u4ee5\u521b\u5efa\u7ee7\u627f\u81eaException\u7c7b\u7684\u5f02\u5e38\u7c7b\u3002<\/p>\n
                                                                                                              import java.io.BufferedReader;\r\nimport java.io.File;\r\nimport java.io.FileReader;\r\n\r\n\r\nclass myException extends Exception{\r\n    myException(String msg) {\r\n        super(msg);\r\n    }\r\n\r\n}\r\n\r\npublic class SampleProgram {\r\n\r\n    public static void main(String[] args) throws Exception {\r\n\r\n        try {\r\n            File file = new File(\"C:\\\\test3.txt\");\r\n            FileReader fr = new FileReader(file);\r\n            BufferedReader bfr = new BufferedReader(fr);\r\n            String ss = null;\r\n\r\n            while((ss = bfr.readLine()) != null) {\r\n                System.out.println(ss + \"\u3092\u8aad\u307f\u8fbc\u307f\u307e\u3057\u305f\");\r\n            }\r\n            bfr.close();\r\n        }catch(Exception e) {\r\n            e.printStackTrace();\r\n            throw new myException(\"thorw\u3057\u307e\u3057\u305f\");\r\n\r\n        }\r\n\r\n    }\r\n\r\n}\r\n\r\n\/\/ \u7d50\u679c\r\njava.io.FileNotFoundException: C:\\test3.txt (\u6307\u5b9a\u3055\u308c\u305f\u30d5\u30a1\u30a4\u30eb\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3002)\r\n    at java.io.FileInputStream.open0(Native Method)\r\n    at java.io.FileInputStream.open(FileInputStream.java:195)\r\n    at java.io.FileInputStream.<init>(FileInputStream.java:138)\r\n    at java.io.FileReader.<init>(FileReader.java:72)\r\n    at SampleProgram.main(SampleProgram.java:19)\r\nException in thread \"main\" myException: thorw\u3057\u307e\u3057\u305f\r\n    at SampleProgram.main(SampleProgram.java:29)\r\n\r\n\r\n<\/code><\/pre>\n
                                                                                                              \u6784\u9020\u51fd\u6570<\/p>\n
                                                                                                              \u57fa\u672c\u7684 de)<\/p>\n
                                                                                                              \u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50<\/span> \u30af\u30e9\u30b9\u540d<\/span> (<\/span>\u5f15\u6570\u578b<\/span> \u5f15\u6570<\/span>)<\/span> {<\/span>\r\n\/\/ \u306a\u306b\u304b\u51e6\u7406<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                                                                                              \u5982\u679c\u5b58\u5728\u7ee7\u627f\u5173\u7cfb\u6784\u9020\u51fd\u6570\u4e0d\u88ab\u7ee7\u627f\u3002<\/p>\n
                                                                                                              \/\/\u89aa\u30af\u30e9\u30b9\r\nclass p{\r\n    p(){\r\n        System.out.println(\"\u89aa\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\uff11\");\r\n    }\r\n    p(int x){\r\n        System.out.println(\"\u89aa\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\uff12\");\r\n    }\r\n}\r\n\/\/\u5b50\u30af\u30e9\u30b9\r\nclass c extends p{\r\n\r\n}\r\n\r\npublic class SampleProgram {\r\n    public static void main(String[] args) throws Exception {\r\n        c cc = new c(10); \r\n        c cc = new c();\r\n    }\r\n}\r\n<\/code><\/pre>\n
                                                                                                              c cc = new c(10);\r\n<\/code><\/pre>\n
                                                                                                              \u5982\u679c\u662f\u8fd9\u6837\u7684\u8bdd\uff0c
                                                                                                              \n\u7f16\u8bd1\u9519\u8bef\uff1a\u6784\u9020\u51fd\u6570c(int)\u672a\u5b9a\u4e49<\/p>\n
                                                                                                              c cc = new c();\r\n<\/code><\/pre>\n
                                                                                                              \u56e0\u4e3a\u5b50\u7c7b\u6ca1\u6709\u58f0\u660e\u4efb\u4f55\u5185\u5bb9\uff0c\u6240\u4ee5\u5728\u8868\u9762\u4e0a\u770b\u8d77\u6765\u7ee7\u627f\u4e86\u7236\u7c7b\u7684\u65e0\u53c2\u6570\u6784\u9020\u51fd\u6570\uff0c\u4f46\u5b9e\u9645\u4e0a\u662f\u7f16\u8bd1\u5668\u81ea\u52a8\u6dfb\u52a0\u4e86\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\u3002<\/p>\n
                                                                                                              \u5728\u4ee3\u7801\u4e0a\u867d\u7136\u770b\u4e0d\u51fa\u6765\uff0c\u4f46\u4f3c\u4e4e\u662f\u8fd9\u6837\u7684\uff0c\u4f3c\u4e4e\u8c03\u7528\u4e86\u7236\u7c7b\u7684\u6784\u9020\u51fd\u6570\u3002<\/p>\n
                                                                                                              class c extends p{\r\n  c(){\r\n    super();\r\n  }\r\n}\r\n<\/code><\/pre>\n
                                                                                                              \u4eb2\u5b50\u662f\u4e00\u5bf9\u5417??\u6211\u660e\u786e\u5730\u4e3a\u5b50\u7c7b\u6dfb\u52a0\u4e86\u6784\u9020\u51fd\u6570\uff0c\u4f46\u4e0d\u77e5\u4f55\u6545\u7236\u7c7b\u7684\u6784\u9020\u51fd\u6570\u4e5f\u88ab\u8c03\u7528\u4e86\u3002<\/p>\n
                                                                                                              class p{\r\n    p(){\r\n        System.out.println(\"\u89aa\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\uff11\");\r\n    }\r\n    p(int x){\r\n        System.out.println(\"\u89aa\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\uff12\");\r\n    }\r\n}\r\n\r\nclass c extends p{\r\n    c(){\r\n        System.out.println(\"\u5b50\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\uff11\");\r\n    }\r\n}\r\n\r\npublic class SampleProgram {\r\n\r\n    public static void main(String[] args) throws Exception {\r\n\r\n        c cc = new c();\r\n\r\n    }\r\n\r\n}\r\n\r\n\/\/ \u7d50\u679c\r\n\u89aa\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\uff11\r\n\u5b50\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\uff11\r\n<\/code><\/pre>\n
                                                                                                              \u6700\u7d42\u7684\u306b\u5b50\u7c7b\u5b9e\u4f8b\u88ab\u521b\u5efa\u65f6\uff0c\u5f53\u7136\u4f1a\u6267\u884c\u5b50\u7c7b\u7684\u6784\u9020\u51fd\u6570\u3002\u4f46\u4f3c\u4e4e\u5728\u6b64\u4e4b\u524d\u4f1a\u81ea\u52a8\u8c03\u7528\u7236\u7c7b\u7684\u65e0\u53c2\u6570\u6784\u9020\u51fd\u6570\uff0c\u8fd9\u5728\u6e90\u4ee3\u7801\u4e2d\u65e0\u6cd5\u770b\u5230\uff0c\u4f46\u636e\u8bf4\u662f\u8fd9\u6837\u7684\u3002<\/p>\n
                                                                                                              class c extends p{\r\n    c(){\r\n        super();\u2605\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u3088\u3063\u3066\u52dd\u624b\u306b\u4ed8\u3051\u3089\u308c\u308b\r\n        System.out.println(\"\u5b50\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\uff11\");\r\n    }\r\n}\r\n<\/code><\/pre>\n
                                                                                                              \u55ef\u55ef\u3002\u3002\u3002\u4e0d\u77e5\u9053\u7684\u8bdd\u53ef\u80fd\u4f1a\u9677\u5165\u56f0\u5883\u554a\u3002\u3002<\/p>\n
                                                                                                              \u5176\u4ed6<\/p>\n
                                                                                                              \u4ee3\u7801\u7247\u6bb5\u4e00\u79cd\u53ef\u4ee5\u7528\u80cc\u8bf5\u6216\u590d\u5236\u7c98\u8d34\u6d41\u7528\u7684\u53e5\u6cd5\u6784\u9020\u3002<\/p>\n
                                                                                                              \u6211\u60f3\u5c3d\u91cf\u51cf\u5c11System.out.println\u7684\u4f7f\u7528\u3002<\/p>\n
                                                                                                              \r\nimport<\/span> static<\/span> java<\/span>.<\/span>lang<\/span>.<\/span>System<\/span>.*;<\/span>\r\n\r\npublic<\/span> class<\/span> SampleProgram<\/span>{<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n        out<\/span>.<\/span>println<\/span>(<\/span>\"hoge\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                                                                                              \u6709\u7528\u7684\u94fe\u63a5\u3072\u3057\u3060\u307e\u7684\u6280\u672f\u5907\u5fd8\u5f55\u9875
                                                                                                              \n\u2192Java<\/p>\n","protected":false},"excerpt":{"rendered":"
                                                                                                              \u6084\u6084\u5730\u5728\u5b66\u4e60\u4e2d\uff0c\u4e3a\u4e86\u5fd8\u8bb0\u4e86\u8981\u81ea\u5df1\u641c\u7d22\u4e00\u4e0b\u3002 \u8bbe\u5b9a\u7684\u6570\u76ee final \u30c7\u30fc\u30bf\u578b \u5b9a\u6570\u540d = \u5024 \u628a\u4ee5\u4e0b\u5185\u5bb9\u7528\u4e2d\u6587 […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31412","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"\nJava\u7684\u4efb\u4f55\u4e8b\u60c5\u90fd\u53ef\u4ee5\u8bb0\u5f55 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8eJava\u7684\u4efb\u4f55\u4e8b\u60c5\u90fd\u53ef\u4ee5\u8bb0\u5f55\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u7684\u4efb\u4f55\u4e8b\u60c5\u90fd\u53ef\u4ee5\u8bb0\u5f55\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u7684\u4efb\u4f55\u4e8b\u60c5\u90fd\u53ef\u4ee5\u8bb0\u5f55\" \/>\n<meta property=\"og:description\" content=\"\u5173\u4e8eJava\u7684\u4efb\u4f55\u4e8b\u60c5\u90fd\u53ef\u4ee5\u8bb0\u5f55\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u7684\u4efb\u4f55\u4e8b\u60c5\u90fd\u53ef\u4ee5\u8bb0\u5f55\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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