{"id":237,"date":"2023-11-21T08:43:59","date_gmt":"2023-11-21T00:43:59","guid":{"rendered":"http:\/\/ericw.top\/?p=237"},"modified":"2023-11-21T08:43:59","modified_gmt":"2023-11-21T00:43:59","slug":"java-%e6%8e%a5%e5%8f%a3","status":"publish","type":"post","link":"http:\/\/ericw.top\/?p=237","title":{"rendered":"Java \u63a5\u53e3"},"content":{"rendered":"

Java \u63a5\u53e3\u5168\u9762\u89e3\u6790<\/h1>\n

\u63a5\u53e3\uff08Interface\uff09\u662f Java \u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\u3002\u5b83\u5141\u8bb8\u5b9a\u4e49\u4e00\u7ec4\u62bd\u8c61\u65b9\u6cd5\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u88ab\u5b9e\u73b0\u7c7b\uff08\u7c7b\uff09\u5b9e\u73b0\u3002\u63a5\u53e3\u63d0\u4f9b\u4e86\u4e00\u79cd\u89c4\u8303\uff0c\u89c4\u5b9a\u4e86\u5b9e\u73b0\u7c7b\u5fc5\u987b\u63d0\u4f9b\u54ea\u4e9b\u65b9\u6cd5\uff0c\u4f46\u4e0d\u5173\u5fc3\u5177\u4f53\u7684\u5b9e\u73b0\u7ec6\u8282\u3002<\/p>\n

\u4ec0\u4e48\u662f\u63a5\u53e3<\/h2>\n

\u5728\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\uff0c\u63a5\u53e3\u662f\u4e00\u79cd\u5951\u7ea6\u6216\u89c4\u8303\uff0c\u5b83\u5b9a\u4e49\u4e86\u4e00\u7ec4\u62bd\u8c61\u65b9\u6cd5\uff0c\u4f46\u6ca1\u6709\u5177\u4f53\u7684\u5b9e\u73b0\u3002\u63a5\u53e3\u5141\u8bb8\u591a\u4e2a\u7c7b\u5b9e\u73b0\u76f8\u540c\u7684\u65b9\u6cd5\u96c6\u5408\uff0c\u4ece\u800c\u5b9e\u73b0\u4ee3\u7801\u7684\u590d\u7528\u548c\u591a\u6001\u6027\u3002\u63a5\u53e3\u662f Java \u4e2d\u5b9e\u73b0\u591a\u91cd\u7ee7\u627f\u7684\u4e00\u79cd\u65b9\u5f0f\uff0c\u56e0\u4e3a\u4e00\u4e2a\u7c7b\u53ef\u4ee5\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3\u3002
\n\u63a5\u53e3\u7684\u7279\u70b9\uff1a<\/strong><\/p>\n

    \n
  1. \u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u90fd\u662f\u62bd\u8c61\u65b9\u6cd5\uff0c\u6ca1\u6709\u65b9\u6cd5\u4f53\u3002<\/li>\n
  2. \u7c7b\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u6216\u591a\u4e2a\u63a5\u53e3\u3002<\/li>\n
  3. \u5b9e\u73b0\u63a5\u53e3\u7684\u7c7b\u5fc5\u987b\u63d0\u4f9b\u63a5\u53e3\u4e2d\u5b9a\u4e49\u7684\u6240\u6709\u65b9\u6cd5\u7684\u5177\u4f53\u5b9e\u73b0\u3002<\/li>\n
  4. \u63a5\u53e3\u53ef\u4ee5\u5305\u542b\u5e38\u91cf\uff0c\u8fd9\u4e9b\u5e38\u91cf\u9ed8\u8ba4\u4e3a public<\/code> static<\/code> final<\/code> \u7c7b\u578b\u3002<\/li>\n<\/ol>\n

    \u63a5\u53e3\u7684\u8bed\u6cd5<\/h2>\n

    \u5728JAVA\u4e2d\uff0c\u5b9a\u4e49\u63a5\u53e3\u4f7f\u7528interface<\/code>\u5173\u952e\u5b57\uff0c\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

    public interface MyInterface {\n    \/\/ \u58f0\u660e\u5e38\u91cf\n    int MY_CONSTANT = 42;\n\n    \/\/ \u58f0\u660e\u62bd\u8c61\u65b9\u6cd5\n    void myMethod1();\n\n    void myMethod2();\n}<\/code><\/pre>\n
    \u4e0a\u8ff0\u4ee3\u7801\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3aMyInterface<\/code>\u7684\u63a5\u53e3\uff0c\u5305\u542b\u4e00\u4e2a\u5e38\u91cfMY_CONSTANT<\/code>\u548c\u4e24\u4e2a\u62bd\u8c61\u65b9\u6cd5myMethod1()<\/code>\u548cmyMethod2()<\/code>\u3002
    \n\u63a5\u53e3\u7684\u65b9\u6cd5\u9ed8\u8ba4\u4e3apublic abstract<\/code>\uff0c\u56e0\u6b64\u53ef\u4ee5\u7701\u7565\u8fd9\u4e9b\u4fee\u9970\u7b26<\/strong><\/p>\n
    \u5b9e\u73b0\u63a5\u53e3<\/h2>\n
    \u4e00\u4e2a\u7c7b\u53ef\u4ee5\u901a\u8fc7\u5173\u952e\u5b57 implements<\/code><\/strong> \u6765\u5b9e\u73b0\u4e00\u4e2a\u63a5\u53e3<\/strong>\u3002\u5b9e\u73b0\u63a5\u53e3\u610f\u5473\u7740\u8be5\u7c7b\u5fc5\u987b\u63d0\u4f9b\u63a5\u53e3\u4e2d\u5b9a\u4e49\u7684\u6240\u6709\u65b9\u6cd5\u7684\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n
    public class MyClass implements MyInterface {\n    @Override\n    public void myMethod1() {\n        \/\/ \u63d0\u4f9b\u5177\u4f53\u5b9e\u73b0\n    }\n\n    @Override\n    public void myMethod2() {\n        \/\/ \u63d0\u4f9b\u5177\u4f53\u5b9e\u73b0\n    }\n}<\/code><\/pre>\n
    \u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cMyClass<\/code> \u7c7b\u5b9e\u73b0\u4e86 Interface1<\/code> \u548c Interface2<\/code> \u63a5\u53e3\uff0c\u5e76\u63d0\u4f9b\u4e86\u8fd9\u4e24\u4e2a\u63a5\u53e3\u4e2d\u65b9\u6cd5\u7684\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n
    \u63a5\u53e3\u7684\u9ed8\u8ba4\u65b9\u6cd5<\/h2>\n
    \u5728JAVA8\u5f15\u5165\u4e86\u9ed8\u8ba4\u65b9\u6cd5\u7684\u6982\u5ff5\uff0c\u5141\u8bb8\u5728\u63a5\u53e3\u4e2d\u63d0\u4f9b\u9ed8\u8ba4\u65b9\u6cd5\u7684\u5b9e\u73b0\u3002\u9ed8\u8ba4\u65b9\u6cd5\u53ef\u4ee5\u5728\u63a5\u53e3\u4e2d\u4f7f\u7528default<\/code>\u5173\u952e\u5b57\u5b9a\u4e49\uff0c\u5e76\u4e14\u53ef\u4ee5\u5728\u5b9e\u73b0\u7c7b\u4e2d\u9009\u62e9\u6027\u8986\u76d6\u3002<\/p>\n
    public interface MyInterface {\n    void myMethod1();\n\n    default void myMethod2() {\n        \/\/ \u63d0\u4f9b\u9ed8\u8ba4\u5b9e\u73b0\n    }\n}<\/code><\/pre>\n
    \u63a5\u53e3\u7684\u9759\u6001\u65b9\u6cd5<\/h2>\n
    JAVA8\u8fd8\u5f15\u5165\u63a5\u53e3\u4e2d\u7684\u9759\u6001\u65b9\u6cd5\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u4f7f\u7528 static<\/code> \u5173\u952e\u5b57\u5b9a\u4e49\uff0c\u5e76\u4e14\u4e0d\u9700\u8981\u5b9e\u73b0\u7c7b\u63d0\u4f9b\u5177\u4f53\u5b9e\u73b0\u3002\u9759\u6001\u65b9\u6cd5\u53ef\u4ee5\u901a\u8fc7\u63a5\u53e3\u540d\u76f4\u63a5\u8c03\u7528\uff0c\u65e0\u9700\u521b\u5efa\u63a5\u53e3\u7684\u5b9e\u4f8b\u3002<\/p>\n
    public interface MyInterface {\n    void myMethod1();\n\n    default void myMethod2() {\n        \/\/ \u63d0\u4f9b\u9ed8\u8ba4\u5b9e\u73b0\n    }\n\n    static void myStaticMethod() {\n        \/\/ \u9759\u6001\u65b9\u6cd5\u7684\u5b9e\u73b0\n    }\n}<\/code><\/pre>\n
    \u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cmyStaticMethod()<\/code> \u662f\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u901a\u8fc7 MyInterface.myStaticMethod()<\/code> \u76f4\u63a5\u8c03\u7528\u3002<\/p>\n
    \u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u7684\u533a\u522b<\/h2>\n
    \u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u90fd\u53ef\u4ee5\u5b9a\u4e49\u62bd\u8c61\u65b9\u6cd5\uff1a<\/p>\n