{"id":203818,"date":"2025-05-22T09:43:06","date_gmt":"2025-05-22T01:43:06","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203818\/"},"modified":"2025-05-22T09:43:06","modified_gmt":"2025-05-22T01:43:06","slug":"java-%e4%b8%ad%e7%9a%84%e8%ae%bf%e9%97%ae%e4%bf%ae%e9%a5%b0%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203818\/","title":{"rendered":"Java \u4e2d\u7684\u8bbf\u95ee\u4fee\u9970\u7b26"},"content":{"rendered":"

<\/b> <\/p>\n

Java \u4e2d\u7684\u8bbf\u95ee\u4fee\u9970\u7b26<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211\u662f\u7684\u4e00\u540d\u4f5c\u8005\uff0c\u4eca\u5929\u7531\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u300aJava \u4e2d\u7684\u8bbf\u95ee\u4fee\u9970\u7b26\u300b<\/span>\uff0c\u672c\u6587\u4e3b\u8981\u4f1a\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e5f\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u3001\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u8f6c\u53d1! \u4e0b\u9762\u5c31\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01<\/p>\n

java \u4e2d\u7684\u8bbf\u95ee\u4fee\u9970\u7b26\u5728\u5b9a\u4e49\u7c7b\u3001\u65b9\u6cd5\u548c\u53d8\u91cf\u7684\u53ef\u89c1\u6027\u548c\u53ef\u8bbf\u95ee\u6027\u65b9\u9762\u53d1\u6325\u7740\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528\u3002\u5b83\u4eec\u662f\u5c01\u88c5\u539f\u5219\u7684\u57fa\u7840\uff0c\u5c01\u88c5\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b (oop) \u4e2d\u7684\u4e00\u4e2a\u5173\u952e\u6982\u5ff5\u3002\u8fd9\u7bc7\u535a\u6587\u5c06\u6df1\u5165\u7814\u7a76 java \u4e2d\u7684\u56db\u4e2a\u4e3b\u8981\u8bbf\u95ee\u4fee\u9970\u7b26\u2014\u2014\u516c\u5171\u3001\u79c1\u6709\u3001\u53d7\u4fdd\u62a4\u548c\u9ed8\u8ba4\uff08\u6216\u5305\u79c1\u6709\uff09\u3002<\/p>\n

java \u63d0\u4f9b\u4e86\u56db\u79cd\u4e3b\u8981\u7684\u8bbf\u95ee\u4fee\u9970\u7b26\uff1a<\/strong><\/p>\n

    \n
  1. \u516c\u5171\uff1a\u58f0\u660e\u4e3a\u516c\u5171\u7684\u6210\u5458\u53ef\u4ee5\u4ece\u4efb\u4f55\u5305\u4e2d\u7684\u4efb\u4f55\u5176\u4ed6\u7c7b\u8bbf\u95ee\u3002\u8fd9\u662f\u9650\u5236\u6700\u5c11\u7684\u8bbf\u95ee\u7ea7\u522b\u3002<\/li>\n
  2. \u79c1\u6709\uff1a\u58f0\u660e\u4e3a\u79c1\u6709\u7684\u6210\u5458\u53ea\u80fd\u5728\u58f0\u660e\u5b83\u4eec\u7684\u7c7b\u4e2d\u8bbf\u95ee\u3002\u8fd9\u662f\u6700\u4e25\u683c\u7684\u8bbf\u95ee\u7ea7\u522b\uff0c\u786e\u4fdd\u654f\u611f\u6570\u636e\u5bf9\u5176\u4ed6\u7c7b\u9690\u85cf\u3002<\/li>\n
  3. \u53d7\u4fdd\u62a4\uff1a\u58f0\u660e\u4e3a\u53d7\u4fdd\u62a4\u7684\u6210\u5458\u53ef\u4ee5\u5728\u540c\u4e00\u5305\u5185\u548c\u5b50\u7c7b\u4e2d\u8bbf\u95ee\uff0c\u5373\u4f7f\u5b83\u4eec\u4f4d\u4e8e\u4e0d\u540c\u7684\u5305\u4e2d\u3002\u6b64\u4fee\u9970\u7b26\u5141\u8bb8\u6bd4\u9ed8\u8ba4\u66f4\u591a\u7684\u53ef\u8bbf\u95ee\u6027\uff0c\u4f46\u6bd4\u516c\u5171\u7684\u8981\u5c11\u3002<\/li>\n
  4. \u9ed8\u8ba4\uff08package-private\uff09\uff1a\u5982\u679c\u672a\u6307\u5b9a\u8bbf\u95ee\u4fee\u9970\u7b26\uff0c\u5219\u8be5\u6210\u5458\u53ea\u80fd\u5728\u5176\u81ea\u5df1\u7684\u5305\u5185\u8bbf\u95ee\u3002\u8fd9\u610f\u5473\u7740\u65e0\u6cd5\u4ece\u5176\u5305\u5916\u90e8\u7684\u7c7b\u8bbf\u95ee\u5b83\u3002<\/li>\n<\/ol>\n

    \u8bbf\u95ee\u4fee\u9970\u7b26\u7684\u91cd\u8981\u6027<\/strong><\/p>\n

      \n
    • \u5c01\u88c5\uff1a\u5b83\u4eec\u901a\u8fc7\u9650\u5236\u5bf9\u5bf9\u8c61\u67d0\u4e9b\u90e8\u5206\u7684\u8bbf\u95ee\u6765\u5e2e\u52a9\u5c01\u88c5\u6570\u636e\u3002<\/li>\n
    • \u5b89\u5168\u6027\uff1a\u901a\u8fc7\u9650\u5236\u8bbf\u95ee\uff0c\u5b83\u4eec\u53ef\u4ee5\u4fdd\u62a4\u654f\u611f\u6570\u636e\u514d\u906d\u672a\u7ecf\u6388\u6743\u7684\u8bbf\u95ee\u3002<\/li>\n
    • \u53ef\u7ef4\u62a4\u6027\uff1a\u6b63\u786e\u4f7f\u7528\u8bbf\u95ee\u4fee\u9970\u7b26\u4f7f\u4ee3\u7801\u66f4\u6613\u4e8e\u7ef4\u62a4\u548c\u91cd\u6784\u3002<\/li>\n
    • \u53ef\u8bfb\u6027\uff1a\u5b83\u4eec\u901a\u8fc7\u6e05\u695a\u5730\u6307\u793a\u54ea\u4e9b\u7ec4\u4ef6\u4f9b\u5916\u90e8\u4f7f\u7528\u6765\u589e\u5f3a\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3002<\/li>\n<\/ul>\n

      1\u3002\u516c\u4f17<\/strong><\/p>\n

      public class calculator {\n    public int add(int a, int b) {\n        return a + b;\n    }\n}\n<\/pre>\n
      \u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u53ef\u4ee5\u4ece\u4efb\u4f55\u5176\u4ed6\u7c7b\u8c03\u7528 add \u65b9\u6cd5\uff1a<\/p>\n
      public class testcalculator {\n    public static void main(string[] args) {\n        calculator calc = new calculator();\n        system.out.println(calc.add(5, 10)); \/\/ output: 15\n    }\n}\n<\/pre>\n
      2\u3002\u79c1\u4eba<\/strong><\/p>\n
      private \u4fee\u9970\u7b26\u9650\u5236\u5bf9\u7c7b\u672c\u8eab\u7684\u8bbf\u95ee\u3002\u6ca1\u6709\u5176\u4ed6\u7c7b\u53ef\u4ee5\u8bbf\u95ee\u79c1\u6709\u6210\u5458\u3002<\/p>\n
      \u793a\u4f8b\uff1a<\/strong><\/p>\n
      public class person {\n    private string name;\n\n    private string getname() {\n        return name;\n    }\n\n    public person(string name) {\n        this.name = name;\n    }\n}\n<\/pre>\n
      \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5728 person \u7c7b\u4e4b\u5916\u65e0\u6cd5\u8bbf\u95ee getname \u65b9\u6cd5\uff1a<\/p>\n
      public class testperson {\n    public static void main(string[] args) {\n        person person = new person(\"alice\");\n        \/\/ system.out.println(person.getname()); \/\/ error: getname() has private access\n    }\n}\n<\/pre>\n
      3\u3002\u53d7\u4fdd\u62a4<\/strong>
       protected \u4fee\u9970\u7b26\u5141\u8bb8\u5728\u540c\u4e00\u5305\u5185\u548c\u5b50\u7c7b\u8fdb\u884c\u8bbf\u95ee\uff0c\u5373\u4f7f\u5b83\u4eec\u4f4d\u4e8e\u4e0d\u540c\u7684\u5305\u4e2d\u3002<\/p>\n
      \u793a\u4f8b\uff1a<\/strong><\/p>\n
      public class animal {\n    protected void makesound() {\n        system.out.println(\"animal sound\");\n    }\n}\n\npublic class dog extends animal {\n    public void bark() {\n        makesound(); \/\/ accessible due to protected modifier\n        system.out.println(\"bark\");\n    }\n}\n<\/pre>\n
      \u8fd9\u91cc\uff0cmakesound \u53ef\u4ee5\u88ab dog \u8bbf\u95ee\uff0cdog \u662f animal \u7684\u5b50\u7c7b\uff1a<\/p>\n
      public class testdog {\n    public static void main(string[] args) {\n        dog dog = new dog();\n        dog.bark(); \/\/ output: animal sound \\n bark\n    }\n}\n<\/pre>\n
      4\u3002\u9ed8\u8ba4\uff08\u5305\u79c1\u6709\uff09<\/strong>
       \u5982\u679c\u672a\u6307\u5b9a\u8bbf\u95ee\u4fee\u9970\u7b26\uff0c\u5219\u9ed8\u8ba4\u4e3a\u5305\u79c1\u6709\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u53ea\u80fd\u5728\u81ea\u5df1\u7684\u5305\u5185\u8bbf\u95ee\u3002
      \u793a\u4f8b\uff1a<\/strong><\/p>\n
      class defaultclass {\n    void display() {\n        system.out.println(\"default access modifier\");\n    }\n}\n<\/pre>\n
      \u6b64\u65b9\u6cd5\u53ea\u80fd\u88ab\u540c\u4e00\u5305\u5185\u7684\u7c7b\u8bbf\u95ee\uff1a<\/p>\n
      public class TestDefaultClass {\n    public static void main(String[] args) {\n        DefaultClass obj = new DefaultClass();\n        obj.display(); \/\/ Output: Default Access Modifier\n    }\n}\n<\/pre>\n
      <\/p>\n
      \u4f7f\u7528\u8bbf\u95ee\u4fee\u9970\u7b26\u7684\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n
        \n
      1. \u5bf9\u53d8\u91cf\u4f7f\u7528\u79c1\u6709\uff1a\u59cb\u7ec8\u5c06\u6210\u5458\u53d8\u91cf\u58f0\u660e\u4e3a\u79c1\u6709\u4ee5\u5f3a\u5236\u5c01\u88c5\u3002<\/li>\n
      2. \u63d0\u4f9b\u516c\u5171getters\/setters\uff1a\u4f7f\u7528\u516c\u5171\u65b9\u6cd5\u6765\u63a7\u5236\u5bf9\u79c1\u6709\u53d8\u91cf\u7684\u8bbf\u95ee\u3002<\/li>\n
      3. \u9650\u5236\u516c\u5171\u65b9\u6cd5\uff1a\u4ec5\u516c\u5f00\u5916\u90e8\u4f7f\u7528\u5fc5\u9700\u7684\u65b9\u6cd5\u3002<\/li>\n
      4. \u4f7f\u7528 protected \u8fdb\u884c\u7ee7\u627f\uff1a\u5bf9\u5b50\u7c7b\u9700\u8981\u91cd\u5199\u6216\u8bbf\u95ee\u7684\u65b9\u6cd5\u4f7f\u7528 protected\u3002<\/li>\n
      5. \u907f\u514d\u8fc7\u591a\u7684\u516c\u5171\u8bbf\u95ee\uff1a\u8c28\u614e\u4f7f\u7528\u516c\u5171\u4fee\u9970\u7b26\uff1b\u8be2\u95ee\u67d0\u4e9b\u4e1c\u897f\u662f\u5426\u786e\u5b9e\u9700\u8981\u516c\u5f00\u3002<\/li>\n<\/ol>\n
        \u7ed3\u8bba<\/strong>
         \u7406\u89e3\u5e76\u6709\u6548\u5730\u4f7f\u7528\u8bbf\u95ee\u4fee\u9970\u7b26\u5bf9\u4e8e\u521b\u5efa\u5065\u58ee\u3001\u5b89\u5168\u548c\u53ef\u7ef4\u62a4\u7684 java \u5e94\u7528\u7a0b\u5e8f\u81f3\u5173\u91cd\u8981\u3002\u901a\u8fc7\u4fee\u9970\u7b26\u63a7\u5236\u53ef\u89c1\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u5f3a\u5236\u5c01\u88c5\u5e76\u4fdd\u62a4\u6211\u4eec\u7684\u4ee3\u7801\u514d\u906d\u8bef\u7528\uff0c\u540c\u65f6\u63d0\u9ad8\u5176\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u5f53\u6211\u4eec\u8bbe\u8ba1\u7c7b\u548c\u63a5\u53e3\u65f6\uff0c\u6211\u4eec\u9700\u8981\u8003\u8651\u54ea\u79cd\u8bbf\u95ee\u7ea7\u522b\u6700\u9002\u5408\u6211\u4eec\u7684\u9700\u6c42\uff0c\u4ee5\u4fc3\u8fdb java \u9879\u76ee\u4e2d\u826f\u597d\u7684\u7f16\u7801\u5b9e\u8df5\u3002<\/p>\n
        \u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n
              \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb\u5220\u9664<\/p>\n","protected":false},"excerpt":{"rendered":"
        Java \u4e2d\u7684\u8bbf\u95ee\u4fee\u9970\u7b26 \u6536\u85cf ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-203818","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203818","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=203818"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203818\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203818"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203818"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}