{"id":31028,"date":"2023-12-24T05:05:47","date_gmt":"2023-01-10T15:22:17","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e6%8e%a5%e5%8f%a3\/"},"modified":"2025-08-12T21:56:31","modified_gmt":"2025-08-12T13:56:31","slug":"java%e6%8e%a5%e5%8f%a3","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e6%8e%a5%e5%8f%a3\/","title":{"rendered":"Java\u63a5\u53e3"},"content":{"rendered":"

\u63a5\u53e3\u662f\u6307\u4e00\u79cd\u5141\u8bb8\u4e0d\u540c\u7cfb\u7edf\u3001\u8bbe\u5907\u6216\u7ec4\u4ef6\u4e4b\u95f4\u8fdb\u884c\u901a\u4fe1\u548c\u4ea4\u4e92\u7684\u65b9\u6cd5\u6216\u7cfb\u7edf\u3002\u5728\u7f16\u5199\u7a0b\u5e8f\u65f6\uff0c\u7c7b\u4f3c\u4e8e\u5b9a\u4e49\u4e00\u7ec4\u65b9\u6cd5\u6765\u6267\u884c\u6307\u5b9a\u64cd\u4f5c\u7684\u7c7b\u3002\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u63a5\u53e3\u6765\u5b9a\u4e49\u5728\u8be5\u7c7b\u4e2d\u4f7f\u7528\u7684\u65b9\u6cd5\u3002\u5728\u63a5\u53e3\u4e2d\uff0c\u65b9\u6cd5\u7684\u5177\u4f53\u5185\u5bb9\u53ef\u4ee5\u4e3a\u7a7a\uff0c\u901a\u5e38\u5728\u4f7f\u7528\u63a5\u53e3\u7684\u7c7b\u5185\u90e8\u5b9e\u73b0\u65b9\u6cd5\u5185\u5bb9\u3002<\/p>\n
\/\/\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/span>\r\ninterface<\/span> \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u540d<\/span>{<\/span>\r\n    \/\/\u30e1\u30bd\u30c3\u30c9\u5b9a\u7fa9<\/span>\r\n    void<\/span> method<\/span> A<\/span>(){}<\/span>\r\n    void<\/span> method<\/span> B<\/span>(){}<\/span>\r\n}<\/span>\r\n\r\n\/\/\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u30af\u30e9\u30b9\u306b\u5b9f\u88c5<\/span>\r\nclass<\/span> A<\/span> implements<\/span> \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u540d<\/span> {<\/span>\r\n    public<\/span> void<\/span> methodA<\/span> {<\/span>\r\n        \/\/\u5b9f\u88c5\u3059\u308b<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u573a\u5408\u5e94\u7528\u5f53\u5b9a\u4e49\u7c7b\u4e4b\u95f4\u7684\u5173\u7cfb\u65f6: \u63a5\u53e3\u662f\u7528\u4e8e\u591a\u4e2a\u7c7b\u5171\u4eab\u76f8\u540c\u65b9\u6cd5\u548c\u884c\u4e3a\u7684\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u901a\u8fc7\u4e0d\u540c\u7c7b\u5b9e\u73b0\u76f8\u540c\u7684\u63a5\u53e3\uff0c\u8fd9\u4e9b\u7c7b\u53ef\u4ee5\u63d0\u4f9b\u5171\u540c\u7684\u64cd\u4f5c\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u5c31\u53ef\u4ee5\u660e\u786e\u5b9a\u4e49\u7c7b\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u5e76\u63d0\u9ad8\u7075\u6d3b\u6027\u548c\u53ef\u6269\u5c55\u6027\u3002<\/p>\n
\u5982\u679c\u8981\u5b9e\u73b0\u591a\u6001\u6027\uff1a\u63a5\u53e3\u53ef\u4ee5\u7528\u4e8e\u5b9e\u73b0\u591a\u6001\u6027\u3002\u901a\u8fc7\u4e0d\u540c\u7684\u7c7b\u5b9e\u73b0\u540c\u4e00\u4e2a\u63a5\u53e3\uff0c\u53ef\u4ee5\u7edf\u4e00\u5730\u5904\u7406\u8fd9\u4e9b\u7c7b\u7684\u5b9e\u4f8b\u3002\u901a\u8fc7\u5728\u7a0b\u5e8f\u4e2d\u4f7f\u7528\u63a5\u53e3\u7c7b\u578b\uff0c\u53ef\u4ee5\u5728\u8fd0\u884c\u65f6\u8c03\u7528\u9002\u5f53\u7684\u7c7b\u65b9\u6cd5\uff0c\u4ece\u800c\u5b9e\u73b0\u5bf9\u5bf9\u8c61\u7684\u7075\u6d3b\u64cd\u4f5c\u3002<\/p>\n
\u8981\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u91cd\u7528\u6027\u65f6\uff0c\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u63a5\u53e3\u6765\u5728\u591a\u4e2a\u7c7b\u4e2d\u5171\u4eab\u76f8\u540c\u7684\u65b9\u6cd5\u53ef\u4ee5\u589e\u52a0\u4ee3\u7801\u7684\u53ef\u91cd\u7528\u6027\u3002\u901a\u8fc7\u5b9e\u73b0\u63a5\u53e3\uff0c\u53ef\u4ee5\u5728\u591a\u4e2a\u7c7b\u4e2d\u91cd\u65b0\u4f7f\u7528\u76f8\u540c\u7684\u63a5\u53e3\u65b9\u6cd5\u3002\u6b64\u5916\uff0c\u5728\u6dfb\u52a0\u65b0\u7c7b\u65f6\uff0c\u53ea\u9700\u5b9e\u73b0\u73b0\u6709\u63a5\u53e3\u5373\u53ef\u4fdd\u6301\u4e0e\u73b0\u6709\u4ee3\u7801\u7684\u517c\u5bb9\u6027\u3002<\/p>\n
\u63a5\u53e3\u7684\u4f5c\u7528 de<\/p>\n
\u5b9e\u73b0\u591a\u6001\u5b9e\u73b0\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7684\u591a\u6001\u6027\u3002
\n\u591a\u6001\u6027\u662f\u6307\u591a\u4e2a\u5bf9\u8c61\u53ef\u4ee5\u5bf9\u76f8\u540c\u7684\u547d\u4ee4\u4ea7\u751f\u4e0d\u540c\u7684\u884c\u4e3a\u3002
\n\u4f8b\u5982\uff0c\u5f53\u6709\u732b\u3001\u72d7\u3001\u9e1f\u7684\u5bf9\u8c61\u65f6\uff0c\u5b83\u4eec\u90fd\u6709\u4e00\u4e2a\u5171\u540c\u7684\u547d\u4ee4”\u53eb”\uff0c\u4f46\u662f\u5b83\u4eec\u7684\u884c\u4e3a\u5206\u522b\u662f”\u55b5\u55b5”\u3001”\u6c6a\u6c6a”\u3001”\u53fd\u53fd”\u3002
\n\u5b9a\u4e49\u8fd9\u4e2a\u5171\u540c\u884c\u4e3a\u7684\u5165\u53e3\u5c31\u662f\u63a5\u53e3\u7684\u4f5c\u7528\u3002<\/p>\n
interface<\/span> Animal<\/span> {<\/span>\r\n    void<\/span> cry<\/span>();<\/span>\r\n}<\/span>\r\n\r\n\/\/\u540c\u3058cry\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u304c\u3001\u51fa\u529b\u3055\u308c\u308b\u7d50\u679c\u306f\u305d\u308c\u305e\u308c\u9055\u3046<\/span>\r\nclass<\/span> Cat<\/span> implements<\/span> Animal<\/span> {<\/span>\r\n    public<\/span> void<\/span> cry<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u306b\u3083\u30fc\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Dog<\/span> implements<\/span> Animal<\/span> {<\/span>\r\n    public<\/span> void<\/span> cry<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u308f\u3093\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Bird<\/span> implements<\/span> Animal<\/span> {<\/span>\r\n    public<\/span> void<\/span> cry<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30d4\u30e8\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
2. \u907f\u514d\u5b9e\u65bd\u9057\u6f0f\u5728\u63a5\u53e3\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u5fc5\u987b\u5728\u5b9e\u73b0\u7c7b\u4e2d\u8fdb\u884c\u91cd\u5199\u3002
\n\u5982\u679c\u6ca1\u6709\u8fdb\u884c\u91cd\u5199\uff0c\u5c06\u4f1a\u51fa\u73b0\u7f16\u8bd1\u9519\u8bef\uff0c\u4ece\u800c\u53ef\u4ee5\u9632\u6b62\u6f0f\u6389\u5b9e\u73b0\u3002<\/p>\n
\u63d0\u9ad8\u67d4\u8edf\u6027\u548c\u64f4\u5c55\u6027<\/p>\n
public<\/span> interface<\/span> Calculation<\/span>  {<\/span>\r\n    int<\/span> sum<\/span>(<\/span>int<\/span> num<\/span>);<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
public<\/span> class<\/span> A<\/span> implements<\/span> Calculation<\/span> {<\/span>\r\n    @Override<\/span>\r\n    public<\/span> int<\/span> sum<\/span>(<\/span>int<\/span> num<\/span>)<\/span> {<\/span>\r\n        int<\/span> price<\/span> =<\/span> num<\/span> +<\/span> 100<\/span>;<\/span>\r\n        return<\/span> price<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\npublic<\/span> class<\/span> B<\/span> implements<\/span> Calculation<\/span> {<\/span>\r\n    @Override<\/span>\r\n    public<\/span> int<\/span> sum<\/span>(<\/span>int<\/span> num<\/span>)<\/span> {<\/span>\r\n        int<\/span> price<\/span> =<\/span> num<\/span> +<\/span> 200<\/span>;<\/span>\r\n        return<\/span> price<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u63a5\u53d7Calculation\u63a5\u53e3\u4f5c\u4e3a\u53c2\u6570\u3002\u901a\u8fc7\u4f7f\u7528\u63a5\u53e3\u4f5c\u4e3a\u65b9\u6cd5\u7684\u53c2\u6570\u548c\u8fd4\u56de\u503c\uff0c\u5b9e\u73b0\u4e86\u53ea\u8981\u662f\u5b9e\u73b0\u4e86Calculation\u63a5\u53e3\u7684\u7c7b\u5c31\u80fd\u591f\u7075\u6d3b\u5730\u88ab\u63a5\u53d7\u3002<\/p>\n
public<\/span> class<\/span> Main<\/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        A<\/span> a<\/span> =<\/span> new<\/span> A<\/span>();<\/span>\r\n        B<\/span> b<\/span> =<\/span> new<\/span> B<\/span>();<\/span>\r\n        \/\/\u540c\u3058\u8a18\u8ff0\u3067\u547c\u3073\u51fa\u305b\u308b<\/span>\r\n        settlement<\/span>(<\/span>a<\/span>);<\/span>\r\n        settlement<\/span>(<\/span>b<\/span>);<\/span>\r\n    }<\/span>\r\n \r\n    public<\/span> static<\/span> void<\/span> settlement<\/span>(<\/span>Calculation<\/span> calculation<\/span>)<\/span> {<\/span>\r\n        int<\/span> num<\/span> =<\/span> calculation<\/span>.<\/span>sum<\/span>(<\/span>100<\/span>);<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u8a08\u7b97\u7d50\u679c\uff1a\"<\/span> +<\/span> num<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u9ed8\u8ba4\u65b9\u6cd5
\n\u5728\u63a5\u53e3\u4e2d\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u5df2\u7ecf\u5b9a\u4e49\u597d\u5904\u7406\u903b\u8f91\u7684\u65b9\u6cd5\u3002
\n\u5728\u65b9\u6cd5\u7c7b\u578b\u7684\u58f0\u660e\u524d\u5199\u4e0a”default”\u5173\u952e\u5b57\u3002<\/p>\n
interface<\/span> Animal<\/span> {<\/span>\r\n    default<\/span> void<\/span> sleep<\/span>()<\/span> {<\/span>\r\n        Sysyem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u5bdd\u3066\u307e\u3059\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> Cat<\/span> implements<\/span> Animal<\/span> {<\/span>\r\n    @Ovierride<\/span>\r\n    public<\/span> void<\/span> sleep<\/span>()<\/span> {<\/span>\r\n        Animal<\/span>.<\/span>super<\/span>.<\/span>sleep<\/span>();<\/span> \/\/\u7d99\u627f\u5143\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5d4c\u5957\u63a5\u53e3\u5728\u63a5\u53e3\u4e2d\u58f0\u660e\u7c7b\u4e5f\u662f\u53ef\u80fd\u7684\u3002
\n\u63a5\u53e3\u5185\u7684\u7c7b\u603b\u662fpublic\u6216static\u3002\u4e60\u60ef\u4e0a\u7701\u7565public\u548cstatic\u3002<\/p>\n
interface<\/span> Animal<\/span> {<\/span>\r\n    class<\/span> Cat<\/span> {<\/span>\r\n        private<\/span> String<\/span> name<\/span>;<\/span>\r\n        public<\/span> Cat<\/span>(<\/span>String<\/span> name<\/span>)<\/span> {<\/span>\r\n            this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\r\n        }<\/span>\r\n        public<\/span> String<\/span> getName<\/span>()<\/span> {<\/span>\r\n            return<\/span> name<\/span>;<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    Cat<\/span> getCat<\/span>();<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> MyImpl<\/span> implements<\/span> Animal<\/span> {<\/span>\r\n    @Ovierride<\/span>\r\n    public<\/span> Cat<\/span> getCat<\/span>()<\/span> {<\/span>\r\n        return<\/span> new<\/span> Animal<\/span>.<\/span>Cat<\/span>(<\/span>\"\u732b\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n\r\nAnimal<\/span> animal<\/span> =<\/span> new<\/span> animal<\/span>();<\/span>\r\nAnimal<\/span>.<\/span>Cat<\/span> cat<\/span> =<\/span> animal<\/span>.<\/span>getCat<\/span>();<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>cat<\/span>.<\/span>getCat<\/span>());<\/span>\r\n<\/code><\/pre>\n
\u591a\u91cd\u7ee7\u627f\u53ef\u4ee5\u88ab\u89c6\u4e3a\u4e00\u4e2a\u7c7b\u4ece\u591a\u4e2a\u7236\u7c7b\u7ee7\u627f\u5c5e\u6027\u548c\u65b9\u6cd5\u7684\u673a\u5236\u3002
\n\u5982\u679c\u4e00\u4e2a\u7c7b\u7ee7\u627f\u4e86\u4e24\u4e2a\u5177\u6709\u76f8\u540c\u7b7e\u540d\u65b9\u6cd5\u7684\u63a5\u53e3\uff0c\u90a3\u4e48\u5b83\u53ea\u9700\u5b9e\u73b0\u8be5\u65b9\u6cd5\u4e00\u6b21\u5373\u53ef\u3002<\/p>\n
interface<\/span> A<\/span> {<\/span>\r\n    void<\/span> method<\/span>();<\/span>\r\n}<\/span>\r\n\r\ninterface<\/span> B<\/span> {<\/span>\r\n    void<\/span> method<\/span>();<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> C<\/span> implements<\/span> A<\/span>,<\/span>B<\/span> {<\/span>\r\n    \/\/method\u30e1\u30bd\u30c3\u30c9\u306f1\u3064\u3067\u826f\u3044<\/span>\r\n    @Ovierride<\/span>\r\n    public<\/span> void<\/span> method<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30e1\u30bd\u30c3\u30c9\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u4e00\u4e2a\u7c7b\u540c\u65f6\u5b9e\u73b0\u4e86\u4e24\u4e2a\u5177\u6709\u4e0d\u540c\u65b9\u6cd5\u7b7e\u540d\u7684\u63a5\u53e3\uff0c\u90a3\u4e48\u9700\u8981\u5206\u522b\u5b9e\u73b0\u6bcf\u4e2a\u63a5\u53e3\u7684\u65b9\u6cd5\u3002<\/p>\n
interface<\/span> A<\/span> {<\/span>\r\n    void<\/span> methodA<\/span>();<\/span>\r\n}<\/span>\r\n\r\ninterface<\/span> B<\/span> {<\/span>\r\n    void<\/span> methodB<\/span>();<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> C<\/span> implements<\/span> A<\/span>,<\/span>B<\/span> {<\/span>\r\n    @Ovierride<\/span>\r\n    public<\/span> void<\/span> methodA<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30e1\u30bd\u30c3\u30c9A\"<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    @Ovierride<\/span>\r\n    public<\/span> void<\/span> methodB<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30e1\u30bd\u30c3\u30c9B\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u4e24\u4e2a\u7ee7\u627f\u5173\u7cfb\u4e2d\u6709\u591a\u91cd\u7ee7\u627f\u7684\u63a5\u53e3\uff0c\u4e14\u5177\u6709\u76f8\u540c\u540d\u79f0\u7684\u65b9\u6cd5\uff0c\u90a3\u4e48\u53ea\u9700\u5b9e\u73b0\u4f4d\u4e8e\u7ee7\u627f\u5173\u7cfb\u4e0b\u5c42\u7684\u7c7b\u578b\u7684\u65b9\u6cd5\u5373\u53ef\u3002<\/p>\n
interface<\/span> A<\/span> {<\/span>\r\n    Object<\/span> methodA<\/span>();<\/span>\r\n}<\/span>\r\n\r\ninterface<\/span> B<\/span> {<\/span>\r\n    String<\/span> methodA<\/span>();<\/span>\r\n}<\/span>\r\n\r\nclass<\/span> C<\/span> implements<\/span> A<\/span>,<\/span>B<\/span> {<\/span>\r\n    \/\/Object\u2192String\u306a\u306e\u3067String\u306e\u65b9\u3092\u5b9f\u88c5\u3059\u308b<\/span>\r\n    @Ovierride<\/span>\r\n    public<\/span> String<\/span> methodA<\/span>()<\/span> {<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u30e1\u30bd\u30c3\u30c9A\"<\/span>);<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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