{"id":1210,"date":"2026-04-12T22:31:17","date_gmt":"2026-04-12T14:31:17","guid":{"rendered":"https:\/\/yunyanglib.cn\/?p=1210"},"modified":"2026-04-12T22:31:18","modified_gmt":"2026-04-12T14:31:18","slug":"%e3%80%90java%e3%80%91%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3%e5%b0%81%e8%a3%85%e3%80%81%e7%bb%a7%e6%89%bf%e3%80%81%e5%a4%9a%e6%80%81%ef%bc%9a%e4%bb%8e%e6%a6%82%e5%bf%b5%e5%88%b0%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=1210","title":{"rendered":"\u3010Java\u3011\u6df1\u5165\u7406\u89e3\u5c01\u88c5\u3001\u7ee7\u627f\u3001\u591a\u6001\uff1a\u4ece\u6982\u5ff5\u5230\u5b9e\u6218"},"content":{"rendered":"\n

\u5927\u5bb6\u597d\uff0c\u6211\u662f\u4e91\u626c\uff5e \u4eca\u5929\u7ee7\u7eed\u5206\u4eab Java \u9762\u5411\u5bf9\u8c61\u7684\u6838\u5fc3\u77e5\u8bc6\u70b9 \u2014\u2014 \u5c01\u88c5\u3001\u7ee7\u627f\u3001\u591a\u6001\u3002\u8fd9\u4e09\u5927\u7279\u5f81\u662f Java \u7f16\u7a0b\u7684\u57fa\u77f3\uff0c\u5408\u7406\u8fd0\u7528\u80fd\u8ba9\u4ee3\u7801\u66f4\u7b80\u6d01\u3001\u7075\u6d3b\u3001\u53ef\u7ef4\u62a4\u3002\u4e0b\u9762\u7ed3\u5408\u5177\u4f53\u4ee3\u7801\u793a\u4f8b\uff0c\u5e26\u5927\u5bb6\u6df1\u5165\u7406\u89e3\u6bcf\u4e2a\u7279\u6027\u7684\u5b9e\u73b0\u4e0e\u5e94\u7528\u573a\u666f\u3002<\/p>\n\n\n\n

\u4e00\u3001\u5f15\u5165\uff1a\u9762\u5411\u5bf9\u8c61\u7684\u6838\u5fc3\u652f\u67f1<\/h2>\n\n\n\n

Java \u9762\u5411\u5bf9\u8c61\u4e09\u5927\u7279\u5f81\uff08\u5c01\u88c5\u3001\u7ee7\u627f\u3001\u591a\u6001\uff09\u76f8\u8f85\u76f8\u6210\uff1a\u5c01\u88c5\u4fdd\u8bc1\u6570\u636e\u5b89\u5168\u6027\uff0c\u7ee7\u627f\u5b9e\u73b0\u4ee3\u7801\u590d\u7528\uff0c\u591a\u6001\u63d0\u5347\u6269\u5c55\u6027\u3002\u638c\u63e1\u8fd9\u4e09\u8005\u7684\u8bbe\u8ba1\u601d\u60f3\uff0c\u80fd\u4ece\u6839\u672c\u4e0a\u63d0\u5347\u4ee3\u7801\u8d28\u91cf\u3002<\/p>\n\n\n\n

\u4e8c\u3001\u5c01\u88c5\uff1a\u6570\u636e\u9690\u85cf\u4e0e\u63a5\u53e3\u66b4\u9732<\/h2>\n\n\n\n

\u5c01\u88c5\u662f\u5c06\u6570\u636e\u548c\u64cd\u4f5c\u6570\u636e\u7684\u65b9\u6cd5\u5c01\u88c5\u4e3a\u72ec\u7acb\u5b9e\u4f53\uff0c\u9690\u85cf\u5185\u90e8\u5b9e\u73b0\u7ec6\u8282\uff0c\u4ec5\u901a\u8fc7\u5bf9\u5916\u63a5\u53e3\u4ea4\u4e92\u3002<\/p>\n\n\n\n

\u6838\u5fc3\u5b9e\u73b0\uff1a\u79c1\u6709\u5c5e\u6027 + \u516c\u5171\u8bbf\u95ee\u5668<\/h3>\n\n\n\n
public class User {\n    \/\/ \u79c1\u6709\u5c5e\u6027\uff1a\u9690\u85cf\u5185\u90e8\u72b6\u6001\n    private String username;\n    private String password;\n    private int age;\n\n    \/\/ \u6784\u9020\u65b9\u6cd5\uff1a\u521d\u59cb\u5316\u5bf9\u8c61\n    public User(String username, String password, int age) {\n        this.username = username;\n        this.password = password;\n        this.age = age;\n    }\n\n    \/\/ \u516c\u5171getter\u65b9\u6cd5\uff1a\u5b89\u5168\u8bbf\u95ee\u5c5e\u6027\n    public String getUsername() {\n        return username;\n    }\n\n    \/\/ \u516c\u5171setter\u65b9\u6cd5\uff1a\u63a7\u5236\u5c5e\u6027\u4fee\u6539\u903b\u8f91\n    public void setAge(int age) {\n        if (age > 0 && age  { \/\/ \u6570\u636e\u5408\u6cd5\u6027\u6821\u9a8c\n            this.age = age;\n        } else {\n            throw new IllegalArgumentException(\"\u5e74\u9f84\u5fc5\u987b\u57281-150\u4e4b\u95f4\");\n        }\n    }\n\n    \/\/ \u91cd\u5199Object\u7c7b\u7684toString()\uff1a\u81ea\u5b9a\u4e49\u5bf9\u8c61\u5b57\u7b26\u4e32\u8868\u793a\n    @Override\n    public String toString() {\n        return \"User{username='\" + username + \"', age=\" + age + \"}\";\n    }\n\n    \/\/ \u91cd\u5199equals()\uff1a\u57fa\u4e8e\u5185\u5bb9\u6bd4\u8f83\u5bf9\u8c61\n    @Override\n    public boolean equals(Object o) {\n        if (this == o) return true;\n        if (o == null || getClass() != o.getClass()) return false;\n        User user = (User) o;\n        return age == user.age && Objects.equals(username, user.username);\n    }\n}\n<\/code><\/pre>\n\n\n\n
\u5c01\u88c5\u7684\u56db\u5927\u4f18\u52bf\uff1a<\/h3>\n\n\n\n
    \n
  1. \u51cf\u5c11\u8026\u5408<\/strong>\uff1a\u5916\u90e8\u4ec5\u901a\u8fc7\u63a5\u53e3\u4ea4\u4e92\uff0c\u5185\u90e8\u4fee\u6539\u4e0d\u5f71\u54cd\u5916\u90e8\u4f7f\u7528<\/li>\n\n\n\n
  2. \u81ea\u7531\u4fee\u6539\u5185\u90e8\u7ed3\u6784<\/strong>\uff1a\u5982\u5bc6\u7801\u52a0\u5bc6\u903b\u8f91\u53ef\u5728 setPassword () \u4e2d\u4fee\u6539<\/li>\n\n\n\n
  3. \u7cbe\u786e\u63a7\u5236\u6210\u5458\u8bbf\u95ee<\/strong>\uff1a\u5982\u5e74\u9f84\u8bbe\u7f6e\u7684\u5408\u6cd5\u6027\u6821\u9a8c<\/li>\n\n\n\n
  4. \u9690\u85cf\u654f\u611f\u4fe1\u606f<\/strong>\uff1a\u5bc6\u7801\u7b49\u79c1\u6709\u5c5e\u6027\u65e0\u6cd5\u76f4\u63a5\u8bbf\u95ee<\/li>\n<\/ol>\n\n\n\n
    \u4e09\u3001\u7ee7\u627f\uff1a\u4ee3\u7801\u590d\u7528\u7684 “\u5bb6\u65cf\u6811”<\/h2>\n\n\n\n
    \u7ee7\u627f\u5141\u8bb8\u5b50\u7c7b\u7ee7\u627f\u7236\u7c7b\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u5b50\u7c7b\u53ef\u6269\u5c55\u65b0\u529f\u80fd\u6216\u91cd\u5199\u7236\u7c7b\u65b9\u6cd5\u3002<\/p>\n\n\n\n
    1. \u5355\u7ee7\u627f\u5b9e\u73b0\uff08extends \u5173\u952e\u5b57\uff09<\/h3>\n\n\n\n
    \/\/ \u7236\u7c7b\uff1a\u62bd\u8c61\u5171\u6027\u7279\u5f81\npublic class Animal {\n    protected String name;\n    protected int age;\n\n    \/\/ \u7236\u7c7b\u6784\u9020\u65b9\u6cd5\n    public Animal(String name, int age) {\n        this.name = name;\n        this.age = age;\n    }\n\n    \/\/ \u7236\u7c7b\u666e\u901a\u65b9\u6cd5\n    public void eat() {\n        System.out.println(name + \"\u6b63\u5728\u8fdb\u98df\");\n    }\n}\n\n\/\/ \u5b50\u7c7b\uff1a\u7ee7\u627f\u7236\u7c7b\u5e76\u6269\u5c55\npublic class Dog extends Animal {\n    \/\/ \u5b50\u7c7b\u7279\u6709\u5c5e\u6027\n    private String breed;\n\n    \/\/ \u5b50\u7c7b\u6784\u9020\u65b9\u6cd5\uff1a\u5fc5\u987b\u5148\u8c03\u7528\u7236\u7c7b\u6784\u9020\n    public Dog(String name, int age, String breed) {\n        super(name, age); \/\/ \u8c03\u7528\u7236\u7c7b\u6709\u53c2\u6784\u9020\n        this.breed = breed;\n    }\n\n    \/\/ \u91cd\u5199\u7236\u7c7b\u65b9\u6cd5\uff1a@Override\u6ce8\u89e3\u6821\u9a8c\u91cd\u5199\u6b63\u786e\u6027\n    @Override\n    public void eat() {\n        System.out.println(name + \"\uff08\" + breed + \"\uff09\u6b63\u5728\u5403\u72d7\u7cae\");\n    }\n\n    \/\/ \u5b50\u7c7b\u7279\u6709\u65b9\u6cd5\n    public void bark() {\n        System.out.println(name + \"\u6c6a\u6c6a\u53eb\");\n    }\n}\n<\/code><\/pre>\n\n\n\n
    2. \u591a\u7ee7\u627f\u6548\u679c\u5b9e\u73b0\uff08\u63a5\u53e3 implements\uff09<\/h3>\n\n\n\n
    Java \u7c7b\u4e0d\u652f\u6301\u591a\u7ee7\u627f\uff0c\u4f46\u53ef\u901a\u8fc7\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3\u95f4\u63a5\u5b9e\u73b0\uff1a<\/p>\n\n\n\n
    \/\/ \u5b9a\u4e49\u591a\u4e2a\u63a5\u53e3\ninterface Flyable {\n    void fly();\n}\n\ninterface Runnable {\n    void run();\n}\n\n\/\/ \u7c7b\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3\uff0c\u9700\u91cd\u5199\u6240\u6709\u62bd\u8c61\u65b9\u6cd5\npublic class Bird extends Animal implements Flyable, Runnable {\n    public Bird(String name, int age) {\n        super(name, age);\n    }\n\n    @Override\n    public void fly() {\n        System.out.println(name + \"\u5c55\u7fc5\u9ad8\u98de\");\n    }\n\n    @Override\n    public void run() {\n        System.out.println(name + \"\u5730\u9762\u5954\u8dd1\");\n    }\n}\n<\/code><\/pre>\n\n\n\n
    3. \u5173\u952e\u7279\u6027\u5bf9\u6bd4<\/h3>\n\n\n\n
    \u7279\u6027<\/th>\u4ee3\u7801\u793a\u4f8b<\/th><\/tr><\/thead>
    \u65b9\u6cd5\u91cd\u5199\uff08Override\uff09<\/td>\u5b50\u7c7b Dog \u91cd\u5199\u7236\u7c7b Animal \u7684 eat () \u65b9\u6cd5\uff0c\u65b9\u6cd5\u540d\u3001\u53c2\u6570\u3001\u8fd4\u56de\u503c\u5b8c\u5168\u4e00\u81f4<\/td><\/tr>
    \u65b9\u6cd5\u91cd\u8f7d\uff08Overload\uff09<\/td>\u540c\u4e00\u7c7b\u4e2d\u540c\u540d\u4e0d\u540c\u53c2\uff1a add (int a, int b) \uff0cadd(double a, double b)<\/td><\/tr>
    this \u4e0e super<\/td>this \u8bbf\u95ee\u672c\u7c7b\u6210\u5458\uff1athis.name 
    super \u8bbf\u95ee\u7236\u7c7b\u6210\u5458\uff1asuper.eat ()<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    4. \u7ee7\u627f\u521d\u59cb\u5316\u987a\u5e8f<\/h3>\n\n\n\n
    class Parent {\n    static { System.out.println(\"1.\u7236\u7c7b\u9759\u6001\u4ee3\u7801\u5757\"); }\n    { System.out.println(\"3.\u7236\u7c7b\u666e\u901a\u4ee3\u7801\u5757\"); }\n    public Parent() { System.out.println(\"4.\u7236\u7c7b\u6784\u9020\u65b9\u6cd5\"); }\n}\n\nclass Child extends Parent {\n    static { System.out.println(\"2.\u5b50\u7c7b\u9759\u6001\u4ee3\u7801\u5757\"); }\n    { System.out.println(\"5.\u5b50\u7c7b\u666e\u901a\u4ee3\u7801\u5757\"); }\n    public Child() { System.out.println(\"6.\u5b50\u7c7b\u6784\u9020\u65b9\u6cd5\"); }\n}\n\n\/\/ \u6267\u884c\u7ed3\u679c\uff1a1\u21922\u21923\u21924\u21925\u21926\npublic class InitOrderTest {\n    public static void main(String[] args) {\n        new Child();\n    }\n}\n<\/code><\/pre>\n\n\n\n
    \u6838\u5fc3\u89c4\u5219<\/strong>\uff1a\u9759\u6001\u4f18\u5148\uff08\u7236\u2192\u5b50\uff09\u2192 \u666e\u901a\u4ee3\u7801\u5757\uff08\u7236\u2192\u5b50\uff09\u2192 \u6784\u9020\u65b9\u6cd5\uff08\u7236\u2192\u5b50\uff09<\/p>\n\n\n\n
    \u56db\u3001\u591a\u6001\uff1a\u540c\u4e00\u884c\u4e3a\u7684\u4e0d\u540c\u8868\u73b0<\/h2>\n\n\n\n
    \u591a\u6001\u662f\u6307\u540c\u4e00\u65b9\u6cd5\u8c03\u7528\uff0c\u56e0\u5bf9\u8c61\u7c7b\u578b\u4e0d\u540c\u4ea7\u751f\u4e0d\u540c\u6267\u884c\u7ed3\u679c\uff0c\u6838\u5fc3\u662f\u52a8\u6001\u7ed1\u5b9a\u3002<\/p>\n\n\n\n
    \u591a\u6001\u7684\u4e09\u4e2a\u5fc5\u8981\u6761\u4ef6\uff1a<\/h3>\n\n\n\n
      \n
    1. \u5b50\u7c7b\u7ee7\u627f\u7236\u7c7b<\/li>\n\n\n\n
    2. \u5b50\u7c7b\u91cd\u5199\u7236\u7c7b\u65b9\u6cd5<\/li>\n\n\n\n
    3. \u7236\u7c7b\u5f15\u7528\u6307\u5411\u5b50\u7c7b\u5bf9\u8c61<\/li>\n<\/ol>\n\n\n\n
      \u4ee3\u7801\u5b9e\u73b0\uff1a<\/h3>\n\n\n\n
      \/\/ \u7236\u7c7b\npublic abstract class Shape {\n    public abstract void draw(); \/\/ \u62bd\u8c61\u65b9\u6cd5\uff1a\u5b9a\u4e49\u89c4\u8303\n}\n\n\/\/ \u5b50\u7c7b1\npublic class Circle extends Shape {\n    @Override\n    public void draw() {\n        System.out.println(\"\u7ed8\u5236\u5706\u5f62\");\n    }\n}\n\n\/\/ \u5b50\u7c7b2\npublic class Rectangle extends Shape {\n    @Override\n    public void draw() {\n        System.out.println(\"\u7ed8\u5236\u77e9\u5f62\");\n    }\n}\n\n\/\/ \u591a\u6001\u6d4b\u8bd5\npublic class PolymorphismTest {\n    public static void main(String[] args) {\n        Shape shape1 = new Circle(); \/\/ \u5411\u4e0a\u8f6c\u578b\uff1a\u7236\u7c7b\u5f15\u7528\u6307\u5411\u5b50\u7c7b\u5bf9\u8c61\n        Shape shape2 = new Rectangle();\n        \n        shape1.draw(); \/\/ \u8f93\u51fa\uff1a\u7ed8\u5236\u5706\u5f62\uff08\u6267\u884c\u5b50\u7c7b\u5b9e\u73b0\uff09\n        shape2.draw(); \/\/ \u8f93\u51fa\uff1a\u7ed8\u5236\u77e9\u5f62\uff08\u6267\u884c\u5b50\u7c7b\u5b9e\u73b0\uff09\n        \n        \/\/ \u5411\u4e0b\u8f6c\u578b\uff1a\u9700\u5148\u5224\u65ad\u7c7b\u578b\n        if (shape1 instanceof Circle) {\n            Circle circle = (Circle) shape1;\n            \/\/ \u8c03\u7528\u5b50\u7c7b\u7279\u6709\u65b9\u6cd5\n        }\n    }\n}\n<\/code><\/pre>\n\n\n\n
      \u591a\u6001\u7684\u4f18\u52bf\uff1a<\/h3>\n\n\n\n