{"id":76953,"date":"2026-02-23T17:05:35","date_gmt":"2026-02-23T09:05:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76953.html"},"modified":"2026-02-23T17:05:35","modified_gmt":"2026-02-23T09:05:35","slug":"java%e7%9a%84%e5%a4%9a%e6%80%81%e4%b8%8e%e6%8e%a5%e5%8f%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76953.html","title":{"rendered":"Java\u7684\u591a\u6001\u4e0e\u63a5\u53e3"},"content":{"rendered":"<h2>\u4e00\u3001\u591a\u6001<\/h2>\n<h3>1.1\u591a\u6001\u7684\u6982\u5ff5<\/h3>\n<p>\u591a\u6001\u662f\u9762\u5411\u5bf9\u8c61\u7684\u4e09\u5927\u7279\u6027\u4e4b\u4e00&#xff0c;\u6838\u5fc3\u662f **&#034;\u4e00\u4e2a\u63a5\u53e3&#xff0c;\u591a\u79cd\u5b9e\u73b0&#034;**\u3002\u5177\u4f53\u8868\u73b0\u4e3a&#xff1a;\u7236\u7c7b \/ \u63a5\u53e3\u7684\u5f15\u7528\u53ef\u4ee5\u6307\u5411\u5b50\u7c7b \/ \u5b9e\u73b0\u7c7b\u7684\u5bf9\u8c61&#xff0c;\u8c03\u7528\u65b9\u6cd5\u65f6\u4f1a\u6267\u884c\u5b9e\u9645\u5bf9\u8c61\u7684\u91cd\u5199\u65b9\u6cd5\u3002<\/p>\n<h3>1.2\u591a\u6001\u7684\u524d\u63d0&#xff1a;<\/h3>\n<ul>\n<li>\u5b58\u5728\u7ee7\u627f \/ \u5b9e\u73b0\u5173\u7cfb<\/li>\n<li>\u65b9\u6cd5\u91cd\u5199&#xff08;&#064;Override&#xff09;<\/li>\n<li>\u7236\u7c7b \/ \u63a5\u53e3\u5f15\u7528\u6307\u5411\u5b50\u7c7b \/ \u5b9e\u73b0\u7c7b\u5bf9\u8c61\u00a0<\/li>\n<\/ul>\n<h3>1.3\u591a\u6001\u7684\u5b9e\u73b0\u65b9\u5f0f<\/h3>\n<p>\u65b9\u6cd5\u91cd\u5199&#xff08;Override&#xff09;<br \/>\n\u5b50\u7c7b\u7ee7\u627f\u7236\u7c7b\u5e76\u91cd\u5199\u7236\u7c7b\u65b9\u6cd5&#xff0c;\u901a\u8fc7\u7236\u7c7b\u5f15\u7528\u8c03\u7528\u5b50\u7c7b\u5bf9\u8c61\u65f6&#xff0c;\u5b9e\u9645\u6267\u884c\u7684\u662f\u5b50\u7c7b\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\/\/ 1. \u7236\u7c7b&#xff1a;\u53ea\u5b9a\u4e49\u4e00\u4e2a\u901a\u7528\u65b9\u6cd5<br \/>\nclass Animal {<br \/>\n    void shout() { \/\/ \u901a\u7528\u884c\u4e3a&#xff1a;\u53eb<br \/>\n        System.out.println(&#034;\u52a8\u7269\u53eb&#034;);<br \/>\n    }<br \/>\n}<\/p>\n<p>\/\/ 2. \u5b50\u7c7b1&#xff1a;\u72d7&#xff08;\u91cd\u5199\u7236\u7c7b\u7684\u53eb\u65b9\u6cd5&#xff09;<br \/>\nclass Dog extends Animal {<br \/>\n    &#064;Override<br \/>\n    void shout() {<br \/>\n        System.out.println(&#034;\u6c6a\u6c6a\u6c6a&#034;);<br \/>\n    }<br \/>\n}<\/p>\n<p>\/\/ 3. \u5b50\u7c7b2&#xff1a;\u732b&#xff08;\u91cd\u5199\u7236\u7c7b\u7684\u53eb\u65b9\u6cd5&#xff09;<br \/>\nclass Cat extends Animal {<br \/>\n    &#064;Override<br \/>\n    void shout() {<br \/>\n        System.out.println(&#034;\u55b5\u55b5\u55b5&#034;);<br \/>\n    }<br \/>\n}<\/p>\n<p>\/\/ \u6d4b\u8bd5&#xff1a;\u591a\u6001\u7684\u6838\u5fc3\u4f53\u73b0<br \/>\npublic class SimplePolymorphism {<br \/>\n    public static void main(String[] args) {<br \/>\n        \/\/ \u6838\u5fc3&#xff1a;\u7236\u7c7b\u5f15\u7528 \u6307\u5411 \u5b50\u7c7b\u5bf9\u8c61<br \/>\n        Animal a1 &#061; new Dog(); \/\/ \u72d7\u88c5\u5230Animal\u7c7b\u578b\u7684\u201c\u76d2\u5b50\u201d\u91cc<br \/>\n        Animal a2 &#061; new Cat(); \/\/ \u732b\u88c5\u5230Animal\u7c7b\u578b\u7684\u201c\u76d2\u5b50\u201d\u91cc<\/p>\n<p>        \/\/ \u8c03\u7528\u540c\u4e00\u4e2a\u65b9\u6cd5&#xff0c;\u6267\u884c\u4e0d\u540c\u903b\u8f91&#xff08;\u591a\u6001&#xff09;<br \/>\n        a1.shout(); \/\/ \u8f93\u51fa&#xff1a;\u6c6a\u6c6a\u6c6a<br \/>\n        a2.shout(); \/\/ \u8f93\u51fa&#xff1a;\u55b5\u55b5\u55b5<br \/>\n    }<br \/>\n}<\/p>\n<p>\u4ee3\u7801\u89e3\u91ca&#xff1a;<\/p>\n<li>\u5148\u5b9a\u4e49\u4e00\u4e2aAnimal&#xff08;\u52a8\u7269&#xff09;\u7236\u7c7b&#xff0c;\u6709\u4e2ashout()&#xff08;\u53eb&#xff09;\u65b9\u6cd5&#xff1b;<\/li>\n<li>Dog&#xff08;\u72d7&#xff09;\u548cCat&#xff08;\u732b&#xff09;\u7ee7\u627fAnimal&#xff0c;\u5404\u81ea\u91cd\u5199shout()\u65b9\u6cd5&#xff0c;\u5b9e\u73b0\u81ea\u5df1\u7684 \u201c\u53eb\u58f0\u201d&#xff1b;<\/li>\n<li>\u6d4b\u8bd5\u65f6&#xff0c;\u7528Animal\u7c7b\u578b\u7684\u53d8\u91cf&#xff08;\u7236\u7c7b\u5f15\u7528&#xff09;\u5206\u522b\u6307\u5411Dog\u548cCat\u5bf9\u8c61&#xff1b;<\/li>\n<li>\u8c03\u7528shout()\u65b9\u6cd5\u65f6&#xff0c;\u53d8\u91cf\u662fAnimal\u7c7b\u578b&#xff0c;\u4f46\u5b9e\u9645\u6267\u884c\u7684\u662f\u5b50\u7c7b&#xff08;\u72d7 \/ \u732b&#xff09;\u7684\u65b9\u6cd5 \u2014\u2014 \u8fd9\u5c31\u662f\u591a\u6001&#xff1a;\u540c\u4e00\u4e2a\u65b9\u6cd5&#xff0c;\u4e0d\u540c\u5bf9\u8c61\u6267\u884c\u4e0d\u540c\u903b\u8f91\u3002<\/li>\n<h2>1.4\u5411\u4e0a\u548c\u5411\u4e0b\u8f6c\u578b<\/h2>\n<ul>\n<li>\u5411\u4e0a\u8f6c\u578b&#xff1a;\u628a\u5b50\u7c7b\u5bf9\u8c61 \u201c\u88c5\u201d \u5230\u7236\u7c7b\u7c7b\u578b\u7684\u53d8\u91cf\u91cc&#xff08;\u81ea\u52a8\u5b8c\u6210&#xff0c;\u4e0d\u7528\u624b\u52a8\u64cd\u4f5c&#xff09;&#xff0c;\u8fd9\u662f\u591a\u6001\u7684\u57fa\u7840&#xff1b;<\/li>\n<li>\u5411\u4e0b\u8f6c\u578b&#xff1a;\u628a\u5df2\u7ecf\u5411\u4e0a\u8f6c\u578b\u7684\u7236\u7c7b\u53d8\u91cf&#xff0c;\u201c\u8fd8\u539f\u201d \u56de\u5b50\u7c7b\u7c7b\u578b&#xff08;\u5fc5\u987b\u624b\u52a8\u5f3a\u8f6c&#xff0c;\u4e14\u6709\u98ce\u9669&#xff09;<\/li>\n<\/ul>\n<p>\/\/ \u7236\u7c7b<br \/>\nclass Animal {<br \/>\n    void shout() {<br \/>\n        System.out.println(&#034;\u52a8\u7269\u53eb&#034;);<br \/>\n    }<br \/>\n}<\/p>\n<p>\/\/ \u5b50\u7c7b<br \/>\nclass Dog extends Animal {<br \/>\n    &#064;Override<br \/>\n    void shout() {<br \/>\n        System.out.println(&#034;\u6c6a\u6c6a\u6c6a&#034;);<br \/>\n    }<br \/>\n    \/\/ \u5b50\u7c7b\u72ec\u6709\u65b9\u6cd5<br \/>\n    void wagTail() {<br \/>\n        System.out.println(&#034;\u6447\u5c3e\u5df4&#034;);<br \/>\n    }<br \/>\n}<\/p>\n<p>public class CastTest {<br \/>\n    public static void main(String[] args) {<br \/>\n        \/\/ \u5411\u4e0a\u8f6c\u578b&#xff1a;\u5b50\u7c7b\u5bf9\u8c61 \u2192 \u7236\u7c7b\u5f15\u7528&#xff08;\u81ea\u52a8\u5b8c\u6210&#xff0c;\u4e0d\u7528\u5199\u989d\u5916\u4ee3\u7801&#xff09;<br \/>\n        Animal a &#061; new Dog(); <\/p>\n<p>        \/\/ \u80fd\u8c03\u7528\u7236\u7c7b\u5b9a\u4e49\u7684\u65b9\u6cd5&#xff08;\u6267\u884c\u5b50\u7c7b\u91cd\u5199\u7684\u903b\u8f91&#xff09;<br \/>\n        a.shout(); \/\/ \u8f93\u51fa&#xff1a;\u6c6a\u6c6a\u6c6a<\/p>\n<p>        \/\/ \u4e0d\u80fd\u8c03\u7528\u5b50\u7c7b\u72ec\u6709\u7684\u65b9\u6cd5&#xff08;\u7236\u7c7b\u5f15\u7528\u201c\u770b\u4e0d\u5230\u201d\u5b50\u7c7b\u72ec\u6709\u65b9\u6cd5&#xff09;<br \/>\n        \/\/ a.wagTail(); \/\/ \u7f16\u8bd1\u62a5\u9519&#xff01;<br \/>\n    }<br \/>\n}<\/p>\n<p>\u5411\u4e0a\u8f6c\u578b\u53ea\u80fd\u5f15\u7528\u7236\u7c7b\u6709\u7684\u65b9\u6cd5 \u5982\u679c\u6ca1\u6709&#xff0c;\u7f16\u8bd1\u5219\u4f1a\u62a5\u9519<\/p>\n<p>\u591a\u6001\u5c31\u662f\u57fa\u4e8e\u5411\u4e0a\u8f6c\u578b\u5b9e\u73b0\u7684\u3002<\/p>\n<p>public class CastTest {<br \/>\n    public static void main(String[] args) {<br \/>\n        \/\/ \u7b2c\u4e00\u6b65&#xff1a;\u5148\u5411\u4e0a\u8f6c\u578b<br \/>\n        Animal a &#061; new Dog(); <\/p>\n<p>        \/\/ \u7b2c\u4e8c\u6b65&#xff1a;\u5411\u4e0b\u8f6c\u578b&#xff08;\u5f3a\u5236\u8f6c\u6362&#xff0c;\u5fc5\u987b\u52a0 (\u5b50\u7c7b\u7c7b\u578b)&#xff09;<br \/>\n        Dog d &#061; (Dog) a; <\/p>\n<p>        \/\/ \u8f6c\u578b\u540e&#xff1a;\u65e2\u80fd\u8c03\u7528\u91cd\u5199\u7684\u65b9\u6cd5&#xff0c;\u4e5f\u80fd\u8c03\u7528\u5b50\u7c7b\u72ec\u6709\u65b9\u6cd5<br \/>\n        d.shout(); \/\/ \u8f93\u51fa&#xff1a;\u6c6a\u6c6a\u6c6a<br \/>\n        d.wagTail(); \/\/ \u8f93\u51fa&#xff1a;\u6447\u5c3e\u5df4<\/p>\n<p>        \/\/ \u274c \u9519\u8bef\u793a\u8303&#xff1a;\u7236\u7c7b\u5bf9\u8c61\u4e0d\u80fd\u8f6c\u6210\u5b50\u7c7b&#xff08;\u4f1a\u629b\u8fd0\u884c\u65f6\u5f02\u5e38&#xff09;<br \/>\n        \/\/ Animal a2 &#061; new Animal();<br \/>\n        \/\/ Dog d2 &#061; (Dog) a2; \/\/ \u8fd0\u884c\u65f6\u629b\u51fa ClassCastException<br \/>\n    }<br \/>\n}<\/p>\n<ul>\n<li>\u5fc5\u987b\u624b\u52a8\u5f3a\u8f6c&#xff1a;\u8981\u5199 (Dog) a&#xff0c;\u544a\u8bc9\u7f16\u8bd1\u5668 \u201c\u6211\u786e\u8ba4\u8fd9\u4e2a\u7236\u7c7b\u5f15\u7528\u6307\u5411\u7684\u662f Dog \u5bf9\u8c61\u201d&#xff1b;<\/li>\n<li>\u524d\u63d0\u6761\u4ef6&#xff1a;\u53ea\u6709\u5f53\u7236\u7c7b\u5f15\u7528\u5b9e\u9645\u6307\u5411\u7684\u662f\u8be5\u5b50\u7c7b\u5bf9\u8c61\u65f6&#xff0c;\u5411\u4e0b\u8f6c\u578b\u624d\u5b89\u5168&#xff08;\u6bd4\u5982 a \u5b9e\u9645\u662f Dog&#xff0c;\u624d\u80fd\u8f6c\u6210 Dog&#xff09;&#xff1b;<\/li>\n<\/ul>\n<h2>\u4e8c\u3001\u63a5\u53e3<\/h2>\n<h3>2.1\u63a5\u53e3\u7684\u5b9a\u4e49<\/h3>\n<p>\u63a5\u53e3&#xff08;Interface&#xff09;\u662f\u7eaf\u62bd\u8c61\u7684 \u201c\u884c\u4e3a\u5951\u7ea6 \/ \u89c4\u8303\u201d \u2014\u2014 \u53ea\u89c4\u5b9a \u201c\u8981\u505a\u4ec0\u4e48\u201d&#xff08;\u5b9a\u4e49\u65b9\u6cd5\u540d&#xff09;&#xff0c;\u4e0d\u89c4\u5b9a \u201c\u600e\u4e48\u505a\u201d&#xff08;\u65e0\u65b9\u6cd5\u4f53&#xff09;&#xff0c;\u7531\u5b9e\u73b0\u7c7b&#xff08;implements&#xff09;\u53bb\u5b8c\u6210\u5177\u4f53\u903b\u8f91\u3002<\/p>\n<ul>\n<li>\u7c7b\u6bd4&#xff1a;\u5c31\u50cf \u201c\u9065\u63a7\u5668\u63a5\u53e3\u201d&#xff0c;\u53ea\u5b9a\u4e49 \u201c\u5f00\u673a\u3001\u6362\u53f0\u201d \u6309\u94ae&#xff0c;\u7535\u89c6\u3001\u7a7a\u8c03\u5404\u81ea\u5b9e\u73b0\u81ea\u5df1\u7684\u5f00\u673a \/ \u6362\u53f0\u903b\u8f91\u3002<\/li>\n<li>\u6838\u5fc3\u4ef7\u503c&#xff1a;\u7edf\u4e00\u884c\u4e3a\u6807\u51c6\u3001\u89e3\u8026\u4ee3\u7801\u3001\u5f25\u8865 Java \u5355\u7ee7\u627f\u7684\u4e0d\u8db3\u3002<\/li>\n<\/ul>\n<h3>2.2\u63a5\u53e3\u7684\u5b9e\u73b0<\/h3>\n<p>\u63a5\u53e3\u4f7f\u7528\u00a0interface\u00a0\u5173\u952e\u5b57\u58f0\u660e&#xff0c;\u9ed8\u8ba4\u6240\u6709\u65b9\u6cd5\u4e3a\u00a0public abstract&#xff08;\u9690\u5f0f\u4fee\u9970\u7b26&#xff09;&#xff0c;\u5c5e\u6027\u4e3a\u00a0public static final\u3002<\/p>\n<p>interface MyInterface {<br \/>\n    void method1(); \/\/ \u9690\u5f0f\u4e3a public abstract<br \/>\n    String CONSTANT &#061; &#034;VALUE&#034;; \/\/ \u9690\u5f0f\u4e3a public static final<br \/>\n}<\/p>\n<p>\u7c7b\u901a\u8fc7\u00a0implements\u00a0\u5173\u952e\u5b57\u5b9e\u73b0\u63a5\u53e3&#xff0c;\u5fc5\u987b\u91cd\u5199\u63a5\u53e3\u4e2d\u6240\u6709\u62bd\u8c61\u65b9\u6cd5&#xff08;\u9664\u975e\u662f\u62bd\u8c61\u7c7b&#xff09;<\/p>\n<p>class MyClass implements MyInterface {<br \/>\n    &#064;Override<br \/>\n    public void method1() {<br \/>\n        System.out.println(&#034;Implemented method&#034;);<br \/>\n    }<br \/>\n}<\/p>\n<h4>2.2.2\u591a\u63a5\u53e3\u5b9e\u73b0<\/h4>\n<p>\u4e00\u4e2a\u7c7b\u53ef\u540c\u65f6\u5b9e\u73b0\u591a\u4e2a\u63a5\u53e3&#xff0c;\u9700\u91cd\u5199\u6240\u6709\u63a5\u53e3\u7684\u62bd\u8c61\u65b9\u6cd5\u3002<\/p>\n<p>interface InterfaceA { void methodA(); }<br \/>\ninterface InterfaceB { void methodB(); }<\/p>\n<p>class MyClass implements InterfaceA, InterfaceB {<br \/>\n    &#064;Override<br \/>\n    public void methodA() { \/* \u5b9e\u73b0 *\/ }<br \/>\n    &#064;Override<br \/>\n    public void methodB() { \/* \u5b9e\u73b0 *\/ }<br \/>\n}<\/p>\n<h4>2.2.3\u63a5\u53e3\u7ee7\u627f<\/h4>\n<p>\u63a5\u53e3\u53ef\u901a\u8fc7\u00a0extends\u00a0\u7ee7\u627f\u5176\u4ed6\u63a5\u53e3&#xff0c;\u652f\u6301\u591a\u7ee7\u627f\u3002\u5b50\u63a5\u53e3\u4f1a\u5408\u5e76\u7236\u63a5\u53e3\u7684\u65b9\u6cd5\u3002<\/p>\n<p>interface ParentA { void methodA(); }<br \/>\ninterface ParentB { void methodB(); }<br \/>\ninterface Child extends ParentA, ParentB { void methodC(); }<\/p>\n<p>class MyClass implements Child {<br \/>\n    &#064;Override<br \/>\n    public void methodA() { \/* \u5b9e\u73b0 *\/ }<br \/>\n    &#064;Override<br \/>\n    public void methodB() { \/* \u5b9e\u73b0 *\/ }<br \/>\n    &#064;Override<br \/>\n    public void methodC() { \/* \u5b9e\u73b0 *\/ }<br \/>\n}<\/p>\n<h3>2.3\u63a5\u53e3&#043;\u7c7b\u57fa\u672c\u7528\u6cd5<\/h3>\n<p>\/\/ 1. \u5b9a\u4e49\u63a5\u53e3&#xff1a;\u53ea\u89c4\u5b9a\u884c\u4e3a&#xff0c;\u4e0d\u5b9e\u73b0<br \/>\ninterface Runable {<br \/>\n    \/\/ \u62bd\u8c61\u65b9\u6cd5&#xff1a;\u53ea\u5b9a\u4e49\u201c\u8dd1\u201d&#xff0c;\u65e0\u903b\u8f91<br \/>\n    void run();<\/p>\n<p>    \/\/ \u9ed8\u8ba4\u65b9\u6cd5&#xff1a;\u6709\u901a\u7528\u903b\u8f91&#xff0c;\u53ef\u9009\u91cd\u5199<br \/>\n    default void warmUp() {<br \/>\n        System.out.println(&#034;\u70ed\u8eab&#xff1a;\u6d3b\u52a8\u5173\u8282&#034;);<br \/>\n    }<\/p>\n<p>    \/\/ \u9759\u6001\u65b9\u6cd5&#xff1a;\u63a5\u53e3\u4e13\u5c5e&#xff0c;\u53ea\u80fd\u901a\u8fc7\u63a5\u53e3\u540d\u8c03\u7528<br \/>\n    static void rule() {<br \/>\n        System.out.println(&#034;\u8dd1\u6b65\u89c4\u5219&#xff1a;\u4e0d\u8981\u8fdd\u89c4&#034;);<br \/>\n    }<\/p>\n<p>    \/\/ \u5e38\u91cf&#xff1a;\u9ed8\u8ba4public static final<br \/>\n    int SPEED_LIMIT &#061; 10; \/\/ \u9650\u901f10<br \/>\n}<\/p>\n<p>\/\/ 2. \u5b9e\u73b0\u7c7b1&#xff1a;\u5b66\u751f\u8dd1\u6b65&#xff08;\u5b9e\u73b0\u63a5\u53e3&#xff09;<br \/>\nclass Student implements Runable {<br \/>\n    &#064;Override<br \/>\n    public void run() { \/\/ \u5fc5\u987b\u5b9e\u73b0\u62bd\u8c61\u65b9\u6cd5<br \/>\n        System.out.println(&#034;\u5b66\u751f\u6162\u8dd1&#xff0c;\u901f\u5ea6\u2264&#034; &#043; SPEED_LIMIT);<br \/>\n    }<br \/>\n    \/\/ \u53ef\u9009\u91cd\u5199\u9ed8\u8ba4\u65b9\u6cd5<br \/>\n    &#064;Override<br \/>\n    public void warmUp() {<br \/>\n        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