{"id":2230,"date":"2025-03-02T10:49:38","date_gmt":"2025-03-02T02:49:38","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2230"},"modified":"2025-03-02T10:49:38","modified_gmt":"2025-03-02T02:49:38","slug":"java-%e5%a4%9a%e6%80%81","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/02\/java-%e5%a4%9a%e6%80%81\/","title":{"rendered":"Java \u591a\u6001"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\"><strong>Java \u591a\u6001\uff08Polymorphism\uff09<\/strong><\/h3>\n\n\n\n<p><strong>\u591a\u6001<\/strong>\uff08Polymorphism\uff09\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u7684\u4e00\u4e2a\u91cd\u8981\u6982\u5ff5\uff0cJava \u4e5f\u5e7f\u6cdb\u652f\u6301\u591a\u6001\u3002\u591a\u6001\u662f\u6307\u540c\u4e00\u4e2a\u65b9\u6cd5\u6216\u64cd\u4f5c\u53ef\u4ee5\u6709\u4e0d\u540c\u7684\u8868\u73b0\u5f62\u5f0f\uff0c\u6216\u8005\u540c\u4e00\u5bf9\u8c61\u5728\u4e0d\u540c\u60c5\u5883\u4e0b\u53ef\u4ee5\u8868\u73b0\u51fa\u4e0d\u540c\u7684\u884c\u4e3a\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u591a\u6001\u4f7f\u5f97\u4e0d\u540c\u7c7b\u7684\u5bf9\u8c61\u53ef\u4ee5\u901a\u8fc7\u7edf\u4e00\u7684\u63a5\u53e3\u8c03\u7528\uff0c\u4f46\u6bcf\u4e2a\u5bf9\u8c61\u4f1a\u6709\u4e0d\u540c\u7684\u884c\u4e3a\u3002<\/p>\n\n\n\n<p>\u5728 Java \u4e2d\uff0c\u591a\u6001\u53ef\u4ee5\u5206\u4e3a <strong>\u7f16\u8bd1\u65f6\u591a\u6001<\/strong>\uff08\u9759\u6001\u591a\u6001\uff09\u548c <strong>\u8fd0\u884c\u65f6\u591a\u6001<\/strong>\uff08\u52a8\u6001\u591a\u6001\uff09\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4e00\u3001\u7f16\u8bd1\u65f6\u591a\u6001\uff08\u9759\u6001\u591a\u6001\uff09<\/strong><\/h3>\n\n\n\n<p>\u7f16\u8bd1\u65f6\u591a\u6001\u901a\u8fc7 <strong>\u65b9\u6cd5\u91cd\u8f7d<\/strong>\uff08Overloading\uff09\u6765\u5b9e\u73b0\u3002\u65b9\u6cd5\u91cd\u8f7d\u6307\u7684\u662f\u5728\u540c\u4e00\u4e2a\u7c7b\u4e2d\uff0c\u65b9\u6cd5\u540d\u76f8\u540c\uff0c\u4f46\u53c2\u6570\u5217\u8868\u4e0d\u540c\uff08\u53ef\u4ee5\u662f\u53c2\u6570\u7684\u6570\u91cf\u3001\u7c7b\u578b\u6216\u987a\u5e8f\u7684\u4e0d\u540c\uff09\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>1. \u65b9\u6cd5\u91cd\u8f7d\u7684\u7279\u70b9\uff1a<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u65b9\u6cd5\u540d\u76f8\u540c\uff0c\u4f46\u53c2\u6570\u5217\u8868\u4e0d\u540c\u3002<\/li>\n\n\n\n<li>\u91cd\u8f7d\u7684\u9009\u62e9\u7531\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\u51b3\u5b9a\u3002<\/li>\n\n\n\n<li>\u4e0d\u80fd\u4ec5\u51ed\u8fd4\u56de\u7c7b\u578b\u6765\u8fdb\u884c\u65b9\u6cd5\u91cd\u8f7d\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Calculator {\n    \/\/ \u52a0\u6cd5\u65b9\u6cd5\uff1a\u4e24\u4e2a\u6574\u6570\u76f8\u52a0\n    public int add(int a, int b) {\n        return a + b;\n    }\n\n    \/\/ \u52a0\u6cd5\u65b9\u6cd5\uff1a\u4e09\u4e2a\u6574\u6570\u76f8\u52a0\n    public int add(int a, int b, int c) {\n        return a + b + c;\n    }\n\n    \/\/ \u52a0\u6cd5\u65b9\u6cd5\uff1a\u4e24\u4e2a\u6d6e\u70b9\u6570\u76f8\u52a0\n    public double add(double a, double b) {\n        return a + b;\n    }\n}\n\npublic class Test {\n    public static void main(String&#91;] args) {\n        Calculator calc = new Calculator();\n\n        System.out.println(calc.add(1, 2));         \/\/ \u8c03\u7528\u4e24\u4e2a\u6574\u6570\u76f8\u52a0\u7684\u65b9\u6cd5\n        System.out.println(calc.add(1, 2, 3));      \/\/ \u8c03\u7528\u4e09\u4e2a\u6574\u6570\u76f8\u52a0\u7684\u65b9\u6cd5\n        System.out.println(calc.add(1.5, 2.5));     \/\/ \u8c03\u7528\u4e24\u4e2a\u6d6e\u70b9\u6570\u76f8\u52a0\u7684\u65b9\u6cd5\n    }\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>3\n6\n4.0<\/code><\/pre>\n\n\n\n<p>\u89e3\u91ca\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>add(int a, int b)<\/code> \u548c <code>add(int a, int b, int c)<\/code> \u4e4b\u95f4\u7684\u533a\u522b\u5728\u4e8e\u53c2\u6570\u7684\u6570\u91cf\uff0c\u7f16\u8bd1\u5668\u4f1a\u6839\u636e\u8c03\u7528\u65f6\u4f20\u5165\u7684\u53c2\u6570\u6765\u51b3\u5b9a\u8c03\u7528\u54ea\u4e2a\u65b9\u6cd5\u3002<\/li>\n\n\n\n<li><code>add(double a, double b)<\/code> \u662f\u56e0\u4e3a\u53c2\u6570\u7c7b\u578b\u4e0d\u540c\uff0c\u6240\u4ee5\u8c03\u7528\u4e86\u6d6e\u70b9\u6570\u7248\u672c\u7684\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4e8c\u3001\u8fd0\u884c\u65f6\u591a\u6001\uff08\u52a8\u6001\u591a\u6001\uff09<\/strong><\/h3>\n\n\n\n<p>\u8fd0\u884c\u65f6\u591a\u6001\u662f\u901a\u8fc7 <strong>\u65b9\u6cd5\u91cd\u5199<\/strong>\uff08Overriding\uff09\u6765\u5b9e\u73b0\u7684\u3002\u5728\u7ee7\u627f\u5173\u7cfb\u4e2d\uff0c\u5b50\u7c7b\u53ef\u4ee5\u91cd\u5199\u7236\u7c7b\u7684\u65b9\u6cd5\uff0c\u5b50\u7c7b\u5bf9\u8c61\u901a\u8fc7\u7236\u7c7b\u5f15\u7528\u6765\u8c03\u7528\u65b9\u6cd5\u65f6\uff0c\u5b9e\u9645\u6267\u884c\u7684\u662f\u5b50\u7c7b\u91cd\u5199\u540e\u7684\u65b9\u6cd5\uff0c\u800c\u4e0d\u662f\u7236\u7c7b\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>1. \u65b9\u6cd5\u91cd\u5199\u7684\u7279\u70b9\uff1a<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b50\u7c7b\u91cd\u5199\u7236\u7c7b\u7684\u65b9\u6cd5\uff0c\u65b9\u6cd5\u7b7e\u540d\uff08\u65b9\u6cd5\u540d\u3001\u53c2\u6570\u5217\u8868\uff09\u5fc5\u987b\u4e00\u81f4\u3002<\/li>\n\n\n\n<li>\u5b50\u7c7b\u53ef\u4ee5\u6539\u53d8\u7236\u7c7b\u65b9\u6cd5\u7684\u5b9e\u73b0\uff0c\u800c\u4e0d\u9700\u8981\u6539\u53d8\u65b9\u6cd5\u7684\u8c03\u7528\u65b9\u5f0f\u3002<\/li>\n\n\n\n<li>\u65b9\u6cd5\u91cd\u5199\u7684\u52a8\u6001\u7ed1\u5b9a\u53d1\u751f\u5728\u8fd0\u884c\u65f6\uff0c\u7a0b\u5e8f\u4f1a\u6839\u636e\u5b9e\u9645\u7684\u5bf9\u8c61\u7c7b\u578b\u6765\u9009\u62e9\u8c03\u7528\u54ea\u4e2a\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>2. \u5173\u952e\u5b57 <code>@Override<\/code><\/strong>\uff1a<\/h4>\n\n\n\n<p>\u4f7f\u7528 <code>@Override<\/code> \u6ce8\u89e3\u6765\u6807\u8bc6\u91cd\u5199\u65b9\u6cd5\u3002\u5982\u679c\u7236\u7c7b\u6ca1\u6709\u8be5\u65b9\u6cd5\u6216\u8005\u7b7e\u540d\u4e0d\u5339\u914d\uff0c\u7f16\u8bd1\u5668\u4f1a\u62a5\u9519\uff0c\u5e2e\u52a9\u907f\u514d\u9519\u8bef\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>3. \u8fd0\u884c\u65f6\u591a\u6001\u7684\u793a\u4f8b\uff1a<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>class Animal {\n    void sound() {\n        System.out.println(\"\u52a8\u7269\u53d1\u51fa\u58f0\u97f3\");\n    }\n}\n\nclass Dog extends Animal {\n    @Override\n    void sound() {\n        System.out.println(\"\u72d7\u53eb\uff1a\u6c6a\u6c6a\");\n    }\n}\n\nclass Cat extends Animal {\n    @Override\n    void sound() {\n        System.out.println(\"\u732b\u53eb\uff1a\u55b5\u55b5\");\n    }\n}\n\npublic class Test {\n    public static void main(String&#91;] args) {\n        Animal myAnimal = new Animal();\n        Animal myDog = new Dog();  \/\/ \u7236\u7c7b\u5f15\u7528\u6307\u5411\u5b50\u7c7b\u5bf9\u8c61\n        Animal myCat = new Cat();  \/\/ \u7236\u7c7b\u5f15\u7528\u6307\u5411\u5b50\u7c7b\u5bf9\u8c61\n\n        myAnimal.sound();  \/\/ \u8c03\u7528\u7236\u7c7b\u65b9\u6cd5\n        myDog.sound();     \/\/ \u8c03\u7528\u5b50\u7c7b Dog \u7684\u91cd\u5199\u65b9\u6cd5\n        myCat.sound();     \/\/ \u8c03\u7528\u5b50\u7c7b Cat \u7684\u91cd\u5199\u65b9\u6cd5\n    }\n}<\/code><\/pre>\n\n\n\n<p><strong>\u8f93\u51fa:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u52a8\u7269\u53d1\u51fa\u58f0\u97f3\n\u72d7\u53eb\uff1a\u6c6a\u6c6a\n\u732b\u53eb\uff1a\u55b5\u55b5<\/code><\/pre>\n\n\n\n<p>\u89e3\u91ca\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>myAnimal.sound()<\/code> \u8c03\u7528\u7684\u662f <code>Animal<\/code> \u7c7b\u4e2d\u7684 <code>sound<\/code> \u65b9\u6cd5\u3002<\/li>\n\n\n\n<li><code>myDog.sound()<\/code> \u548c <code>myCat.sound()<\/code> \u8c03\u7528\u7684\u662f\u5206\u522b\u5728 <code>Dog<\/code> \u548c <code>Cat<\/code> \u7c7b\u4e2d\u91cd\u5199\u7684\u65b9\u6cd5\u3002<\/li>\n\n\n\n<li>\u867d\u7136 <code>myDog<\/code> \u548c <code>myCat<\/code> \u7684\u58f0\u660e\u7c7b\u578b\u662f <code>Animal<\/code>\uff0c\u4f46\u662f\u5b9e\u9645\u6267\u884c\u7684\u662f\u5b83\u4eec\u5404\u81ea\u7c7b\u4e2d\u7684 <code>sound<\/code> \u65b9\u6cd5\uff0c\u8fd9\u5c31\u662f <strong>\u8fd0\u884c\u65f6\u591a\u6001<\/strong>\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>4. \u7236\u7c7b\u5f15\u7528\u6307\u5411\u5b50\u7c7b\u5bf9\u8c61<\/strong><\/h4>\n\n\n\n<p>\u901a\u8fc7\u7236\u7c7b\u5f15\u7528\u6765\u8c03\u7528\u5b50\u7c7b\u7684\u65b9\u6cd5\uff0c\u7a0b\u5e8f\u4f1a\u6839\u636e\u5b9e\u9645\u7684\u5bf9\u8c61\u7c7b\u578b\u6765\u8c03\u7528\u5bf9\u5e94\u7684\u91cd\u5199\u65b9\u6cd5\u3002\u5373\u4f7f\u58f0\u660e\u7c7b\u578b\u662f\u7236\u7c7b\uff0c\u5b9e\u9645\u8c03\u7528\u7684\u4f9d\u7136\u662f\u5b50\u7c7b\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4e09\u3001\u591a\u6001\u7684\u4f18\u52bf<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u63d0\u9ad8\u7075\u6d3b\u6027<\/strong>\uff1a\u901a\u8fc7\u591a\u6001\uff0c\u7a0b\u5e8f\u5728\u8fd0\u884c\u65f6\u53ef\u4ee5\u6839\u636e\u5bf9\u8c61\u7684\u5b9e\u9645\u7c7b\u578b\u9009\u62e9\u8c03\u7528\u9002\u5f53\u7684\u65b9\u6cd5\uff0c\u4ece\u800c\u907f\u514d\u4e86\u786c\u7f16\u7801\uff0c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u7075\u6d3b\u6027\u3002<\/li>\n\n\n\n<li><strong>\u7b80\u5316\u4ee3\u7801<\/strong>\uff1a\u591a\u6001\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u7edf\u4e00\u7684\u63a5\u53e3\u6765\u5904\u7406\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u907f\u514d\u4e86\u5927\u91cf\u7684\u6761\u4ef6\u5224\u65ad\uff0c\u7b80\u5316\u4e86\u4ee3\u7801\u7684\u903b\u8f91\u3002<\/li>\n\n\n\n<li><strong>\u6269\u5c55\u6027\u5f3a<\/strong>\uff1a\u4f7f\u7528\u591a\u6001\u65f6\uff0c\u589e\u52a0\u65b0\u7c7b\uff08\u5982\u65b0\u589e\u4e00\u4e2a\u52a8\u7269\u7c7b\u578b\uff09\u65f6\uff0c\u4e0d\u9700\u8981\u4fee\u6539\u73b0\u6709\u7684\u4ee3\u7801\uff0c\u53ea\u9700\u8981\u6dfb\u52a0\u65b0\u7684\u5b50\u7c7b\uff0c\u5e76\u91cd\u5199\u7236\u7c7b\u7684\u65b9\u6cd5\u5373\u53ef\u3002<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u56db\u3001\u591a\u6001\u7684\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e8b\u4ef6\u76d1\u542c<\/strong>\uff1a\u6bd4\u5982\u5728 GUI \u7f16\u7a0b\u4e2d\uff0c\u76d1\u542c\u6309\u94ae\u70b9\u51fb\u4e8b\u4ef6\u65f6\uff0c\u53ef\u4ee5\u5c06\u4e0d\u540c\u7684\u6309\u94ae\u7684\u4e8b\u4ef6\u5904\u7406\u65b9\u6cd5\u901a\u8fc7\u7edf\u4e00\u7684\u63a5\u53e3\u6216\u7236\u7c7b\u65b9\u6cd5\u6765\u8c03\u7528\uff0c\u4e0d\u540c\u7684\u6309\u94ae\u53ef\u4ee5\u6709\u4e0d\u540c\u7684\u4e8b\u4ef6\u5904\u7406\u903b\u8f91\u3002<\/li>\n\n\n\n<li><strong>\u63a5\u53e3\u56de\u8c03<\/strong>\uff1aJava \u7684\u96c6\u5408\u6846\u67b6\u5e7f\u6cdb\u4f7f\u7528\u4e86\u591a\u6001\u3002\u4f8b\u5982\uff0c<code>List<\/code> \u63a5\u53e3\u7684\u4e0d\u540c\u5b9e\u73b0\u7c7b\uff08\u5982 <code>ArrayList<\/code>\u3001<code>LinkedList<\/code>\uff09\u53ef\u4ee5\u901a\u8fc7\u540c\u4e00\u4e2a <code>List<\/code> \u7c7b\u578b\u7684\u5f15\u7528\u8fdb\u884c\u64cd\u4f5c\u3002<\/li>\n\n\n\n<li><strong>\u62bd\u8c61\u5de5\u5382\u6a21\u5f0f<\/strong>\uff1a\u901a\u8fc7\u62bd\u8c61\u7c7b\u6216\u63a5\u53e3\uff0c\u5b9a\u4e49\u4ea7\u54c1\u7684\u7edf\u4e00\u63a5\u53e3\uff0c\u4e0d\u540c\u7684\u5177\u4f53\u4ea7\u54c1\u53ef\u4ee5\u901a\u8fc7\u5de5\u5382\u65b9\u6cd5\u5b9e\u4f8b\u5316\uff0c\u4ece\u800c\u8fbe\u5230\u4f7f\u7528\u591a\u6001\u7684\u6548\u679c\u3002<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u603b\u7ed3<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7f16\u8bd1\u65f6\u591a\u6001\uff08\u9759\u6001\u591a\u6001\uff09<\/strong>\uff1a\u901a\u8fc7 <strong>\u65b9\u6cd5\u91cd\u8f7d<\/strong> 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