{"id":50204,"date":"2025-07-30T21:56:37","date_gmt":"2025-07-30T13:56:37","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/50204.html"},"modified":"2025-07-30T21:56:37","modified_gmt":"2025-07-30T13:56:37","slug":"java%e9%9d%a2%e8%af%95-java%e9%9d%a2%e8%af%95-java%e9%9d%a2%e8%af%95%ef%bc%81%e7%a7%8b%e6%8b%9b%e7%bb%88%e4%ba%8e%e4%b8%8a%e5%b2%b8%e4%ba%86%ef%bc%8cjava%e9%9d%a2%e8%af%95%e9%a2%98%e5%8f%8a%e7%ad%94","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/50204.html","title":{"rendered":"Java\u9762\u8bd5-Java\u9762\u8bd5-Java\u9762\u8bd5\uff01\u79cb\u62db\u7ec8\u4e8e\u4e0a\u5cb8\u4e86\uff0cJava\u9762\u8bd5\u9898\u53ca\u7b54\u6848\u5206\u4eab\uff01"},"content":{"rendered":"<p>\u79cb\u62db\u7ec8\u4e8e\u6210\u529f\u4e0a\u5cb8\u4e86&#xff01;<\/p>\n<p>Java\u9762\u8bd5\u662f\u8bb8\u591a\u6c42\u804c\u8005\u7684\u5173\u952e\u73af\u8282&#xff0c;\u5206\u4eabJava\u9762\u8bd5\u9898\u548c\u7b54\u6848\u80fd\u5e2e\u52a9\u66f4\u591a\u4eba\u51c6\u5907\u3002<\/p>\n<p>\u6211\u5c06\u57fa\u4e8e\u5e38\u89c1Java\u9762\u8bd5\u5185\u5bb9&#xff0c;\u6574\u7406\u4e00\u4efd\u7ed3\u6784\u6e05\u6670\u7684\u9898\u76ee\u53ca\u7b54\u6848\u6e05\u5355\u3002<\/p>\n<h4>1. Java\u57fa\u7840\u77e5\u8bc6<\/h4>\n<p>\u95ee\u98981&#xff1a;\u89e3\u91caJava\u4e2d\u7684\u591a\u6001&#xff08;Polymorphism&#xff09;&#xff0c;\u5e76\u4e3e\u4f8b\u8bf4\u660e\u3002<br \/>\n\u7b54\u6848&#xff1a; \u591a\u6001\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u6838\u5fc3\u6982\u5ff5&#xff0c;\u6307\u540c\u4e00\u4e2a\u65b9\u6cd5\u5728\u4e0d\u540c\u5bf9\u8c61\u4e0a\u8868\u73b0\u51fa\u4e0d\u540c\u884c\u4e3a\u3002\u5b83\u901a\u8fc7\u7ee7\u627f\u548c\u63a5\u53e3\u5b9e\u73b0\u3002<\/p>\n<ul>\n<li>\u8fd0\u884c\u65f6\u591a\u6001&#xff08;\u52a8\u6001\u7ed1\u5b9a&#xff09;&#xff1a;\u4f7f\u7528\u7236\u7c7b\u5f15\u7528\u6307\u5411\u5b50\u7c7b\u5bf9\u8c61\u3002\u4f8b\u5982&#xff1a;\n<p>class Animal {<br \/>\n    void sound() { System.out.println(&#034;Animal sound&#034;); }<br \/>\n}<br \/>\nclass Dog extends Animal {<br \/>\n    void sound() { System.out.println(&#034;Bark&#034;); } \/\/ \u91cd\u5199\u65b9\u6cd5<br \/>\n}<br \/>\npublic class Main {<br \/>\n    public static void main(String[] args) {<br \/>\n        Animal myAnimal &#061; new Dog(); \/\/ \u7236\u7c7b\u5f15\u7528\u5b50\u7c7b\u5bf9\u8c61<br \/>\n        myAnimal.sound(); \/\/ \u8f93\u51fa &#034;Bark&#034;&#xff0c;\u8fd0\u884c\u65f6\u51b3\u5b9a<br \/>\n    }<br \/>\n}<\/p>\n<\/li>\n<li>\u7f16\u8bd1\u65f6\u591a\u6001&#xff08;\u9759\u6001\u7ed1\u5b9a&#xff09;&#xff1a;\u901a\u8fc7\u65b9\u6cd5\u91cd\u8f7d\u5b9e\u73b0&#xff0c;\u4f8b\u5982\u540c\u4e00\u7c7b\u4e2d\u591a\u4e2a\u540c\u540d\u65b9\u6cd5\u4f46\u53c2\u6570\u4e0d\u540c\u3002<\/li>\n<\/ul>\n<p>\u95ee\u98982&#xff1a;\u4ec0\u4e48\u662fJava\u7684\u5783\u573e\u56de\u6536&#xff08;Garbage Collection&#xff09;&#xff1f;\u7b80\u8ff0\u5176\u5de5\u4f5c\u539f\u7406\u3002<br \/>\n\u7b54\u6848&#xff1a; \u5783\u573e\u56de\u6536\u662fJVM\u81ea\u52a8\u7ba1\u7406\u5185\u5b58\u7684\u673a\u5236&#xff0c;\u56de\u6536\u4e0d\u518d\u4f7f\u7528\u7684\u5bf9\u8c61\u4ee5\u91ca\u653e\u5185\u5b58\u3002<\/p>\n<ul>\n<li>\u5de5\u4f5c\u539f\u7406&#xff1a;\u57fa\u4e8e\u53ef\u8fbe\u6027\u5206\u6790\u3002JVM\u4eceGC Roots&#xff08;\u5982\u9759\u6001\u53d8\u91cf\u3001\u6d3b\u52a8\u7ebf\u7a0b&#xff09;\u51fa\u53d1&#xff0c;\u6807\u8bb0\u6240\u6709\u53ef\u8fbe\u5bf9\u8c61&#xff0c;\u4e0d\u53ef\u8fbe\u5bf9\u8c61\u88ab\u56de\u6536\u3002<\/li>\n<li>\u5e38\u89c1\u7b97\u6cd5&#xff1a;\u6807\u8bb0-\u6e05\u9664&#xff08;Mark-Sweep&#xff09;\u3001\u590d\u5236&#xff08;Copying&#xff09;\u3001\u5206\u4ee3\u6536\u96c6&#xff08;Generational&#xff09;\u3002\u5206\u4ee3\u6536\u96c6\u5c06\u5806\u5206\u4e3a\u65b0\u751f\u4ee3&#xff08;Young Generation&#xff09;\u548c\u8001\u5e74\u4ee3&#xff08;Old Generation&#xff09;&#xff0c;\u9488\u5bf9\u4e0d\u540c\u5bf9\u8c61\u751f\u547d\u5468\u671f\u4f18\u5316\u3002<\/li>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;\u5783\u573e\u56de\u6536\u7684\u5e73\u5747\u65f6\u95f4\u590d\u6742\u5ea6\u4e3a$O(n)$&#xff0c;\u5176\u4e2d$n$\u662f\u5bf9\u8c61\u6570\u91cf&#xff0c;\u4f46\u53ef\u80fd\u56e0\u7b97\u6cd5\u800c\u5f02&#xff08;\u5982\u6807\u8bb0-\u6e05\u9664\u4e3a$O(n)$&#xff0c;\u5206\u4ee3\u6536\u96c6\u53ef\u4f18\u5316\u5230$O(1)$\u5e73\u5747\u60c5\u51b5&#xff09;\u3002<\/li>\n<\/ul>\n<h4>2. \u96c6\u5408\u6846\u67b6\u4e0e\u5e76\u53d1<\/h4>\n<p>\u95ee\u98983&#xff1a;\u89e3\u91caHashMap\u7684\u5de5\u4f5c\u539f\u7406&#xff0c;\u5305\u62ec\u54c8\u5e0c\u51b2\u7a81\u7684\u5904\u7406\u3002<br \/>\n\u7b54\u6848&#xff1a; HashMap\u57fa\u4e8e\u54c8\u5e0c\u8868\u5b9e\u73b0\u952e\u503c\u5bf9\u5b58\u50a8&#xff0c;\u63d0\u4f9b$O(1)$\u5e73\u5747\u65f6\u95f4\u590d\u6742\u5ea6&#xff08;\u6700\u574f$O(n)$&#xff09;\u3002<\/p>\n<ul>\n<li>\u54c8\u5e0c\u51fd\u6570&#xff1a;\u901a\u8fc7hashCode()\u8ba1\u7b97\u6876\u4f4d\u7f6e&#xff0c;\u4f8b\u5982index &#061; hash(key) % capacity\u3002<\/li>\n<li>\u54c8\u5e0c\u51b2\u7a81\u5904\u7406&#xff1a;\u4f7f\u7528\u94fe\u8868\u6216\u7ea2\u9ed1\u6811&#xff08;JDK 8&#043;&#xff09;\u3002\u5f53\u6876\u4e2d\u5143\u7d20\u8d85\u8fc7\u9608\u503c&#xff08;\u9ed8\u8ba48&#xff09;&#xff0c;\u94fe\u8868\u8f6c\u4e3a\u7ea2\u9ed1\u6811&#xff0c;\u4f18\u5316\u67e5\u8be2\u5230$O(\\\\log n)$\u3002<\/li>\n<li>\u793a\u4f8b\u4ee3\u7801&#xff1a;\u6dfb\u52a0\u952e\u503c\u5bf9\n<p>import java.util.HashMap;<br \/>\npublic class Example {<br \/>\n    public static void main(String[] args) {<br \/>\n        HashMap&lt;String, Integer&gt; map &#061; new HashMap&lt;&gt;();<br \/>\n        map.put(&#034;apple&#034;, 1); \/\/ \u54c8\u5e0c\u8ba1\u7b97\u4f4d\u7f6e<br \/>\n        map.put(&#034;banana&#034;, 2);<br \/>\n        System.out.println(map.get(&#034;apple&#034;)); \/\/ \u8f93\u51fa 1<br \/>\n    }<br \/>\n}<\/p>\n<\/li>\n<\/ul>\n<p>\u95ee\u98984&#xff1a;\u5982\u4f55\u5728Java\u4e2d\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168&#xff1f;\u7ed9\u51fa\u4e24\u79cd\u65b9\u5f0f\u5e76\u6bd4\u8f83\u3002<br \/>\n\u7b54\u6848&#xff1a; \u7ebf\u7a0b\u5b89\u5168\u786e\u4fdd\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u6570\u636e\u4e00\u81f4\u6027\u3002<\/p>\n<ul>\n<li>\u65b9\u5f0f1&#xff1a;\u4f7f\u7528synchronized\u5173\u952e\u5b57&#xff1a;\u9501\u5b9a\u65b9\u6cd5\u6216\u4ee3\u7801\u5757&#xff0c;\u540c\u4e00\u65f6\u95f4\u53ea\u5141\u8bb8\u4e00\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u3002\n<p>public class Counter {<br \/>\n    private int count &#061; 0;<br \/>\n    public synchronized void increment() { count&#043;&#043;; } \/\/ \u7ebf\u7a0b\u5b89\u5168<br \/>\n}<\/p>\n<\/li>\n<li>\u65b9\u5f0f2&#xff1a;\u4f7f\u7528java.util.concurrent\u5305&#xff1a;\u5982ConcurrentHashMap\u6216AtomicInteger&#xff0c;\u57fa\u4e8eCAS&#xff08;Compare-And-Swap&#xff09;\u5b9e\u73b0\u65e0\u9501\u5e76\u53d1&#xff0c;\u6027\u80fd\u66f4\u9ad8\u3002\n<p>import java.util.concurrent.atomic.AtomicInteger;<br \/>\npublic class SafeCounter {<br \/>\n    private AtomicInteger count &#061; new AtomicInteger(0);<br \/>\n    public void increment() { count.incrementAndGet(); } \/\/ CAS\u64cd\u4f5c<br \/>\n}<\/p>\n<\/li>\n<li>\u6bd4\u8f83&#xff1a;synchronized\u7b80\u5355\u4f46\u53ef\u80fd\u5f15\u8d77\u7ebf\u7a0b\u963b\u585e&#xff1b;concurrent\u5305\u66f4\u9ad8\u6548&#xff0c;\u9002\u5408\u9ad8\u5e76\u53d1\u573a\u666f\u3002<\/li>\n<\/ul>\n<h4>3. \u7b97\u6cd5\u4e0e\u8bbe\u8ba1\u6a21\u5f0f<\/h4>\n<p>\u95ee\u98985&#xff1a;\u5b9e\u73b0\u4e00\u4e2a\u5feb\u901f\u6392\u5e8f\u7b97\u6cd5&#xff0c;\u5e76\u5206\u6790\u65f6\u95f4\u590d\u6742\u5ea6\u3002<br \/>\n\u7b54\u6848&#xff1a; \u5feb\u901f\u6392\u5e8f\u662f\u9ad8\u6548\u7684\u5206\u6cbb\u6392\u5e8f\u7b97\u6cd5\u3002<\/p>\n<ul>\n<li>\u4ee3\u7801\u5b9e\u73b0&#xff1a;\n<p>public class QuickSort {<br \/>\n    public static void quickSort(int[] arr, int low, int high) {<br \/>\n        if (low &lt; high) {<br \/>\n            int pi &#061; partition(arr, low, high); \/\/ \u5206\u533a\u7d22\u5f15<br \/>\n            quickSort(arr, low, pi &#8211; 1);  \/\/ \u9012\u5f52\u5de6\u5b50\u6570\u7ec4<br \/>\n            quickSort(arr, pi &#043; 1, high); \/\/ \u9012\u5f52\u53f3\u5b50\u6570\u7ec4<br \/>\n        }<br \/>\n    }<br \/>\n    private static int partition(int[] arr, int low, int high) {<br \/>\n        int pivot &#061; arr[high]; \/\/ \u57fa\u51c6\u5143\u7d20<br \/>\n        int i &#061; low &#8211; 1;<br \/>\n        for (int j &#061; low; j &lt; high; j&#043;&#043;) {<br \/>\n            if (arr[j] &lt; pivot) {<br \/>\n                i&#043;&#043;;<br \/>\n                swap(arr, i, j); \/\/ \u4ea4\u6362\u5143\u7d20<br \/>\n            }<br \/>\n        }<br \/>\n        swap(arr, i &#043; 1, high); \/\/ \u653e\u7f6e\u57fa\u51c6\u5143\u7d20<br \/>\n        return i &#043; 1;<br \/>\n    }<br \/>\n    private static void swap(int[] arr, int i, int j) {<br \/>\n        int temp &#061; arr[i];<br \/>\n        arr[i] &#061; arr[j];<br \/>\n        arr[j] &#061; temp;<br \/>\n    }<br \/>\n    public static void main(String[] args) {<br \/>\n        int[] arr &#061; {10, 7, 8, 9, 1, 5};<br \/>\n        quickSort(arr, 0, arr.length &#8211; 1);<br \/>\n        System.out.println(Arrays.toString(arr)); \/\/ \u8f93\u51fa [1, 5, 7, 8, 9, 10]<br \/>\n    }<br \/>\n}<\/p>\n<\/li>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;\u5e73\u5747\u60c5\u51b5$O(n \\\\log n)$&#xff0c;\u6700\u574f\u60c5\u51b5&#xff08;\u5982\u5df2\u6392\u5e8f\u6570\u7ec4&#xff09;$O(n^2)$\u3002\u7a7a\u95f4\u590d\u6742\u5ea6$O(\\\\log n)$&#xff08;\u9012\u5f52\u6808&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u95ee\u98986&#xff1a;\u89e3\u91ca\u5355\u4f8b\u6a21\u5f0f&#xff08;Singleton Pattern&#xff09;&#xff0c;\u5e76\u7ed9\u51fa\u7ebf\u7a0b\u5b89\u5168\u5b9e\u73b0\u3002<br \/>\n\u7b54\u6848&#xff1a; \u5355\u4f8b\u6a21\u5f0f\u786e\u4fdd\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b&#xff0c;\u5e76\u63d0\u4f9b\u5168\u5c40\u8bbf\u95ee\u70b9\u3002<\/p>\n<ul>\n<li>\u7ebf\u7a0b\u5b89\u5168\u5b9e\u73b0&#xff08;\u53cc\u91cd\u68c0\u67e5\u9501&#xff09;&#xff1a;\u9002\u7528\u4e8e\u591a\u7ebf\u7a0b\u73af\u5883\u3002\n<p>public class Singleton {<br \/>\n    private static volatile Singleton instance; \/\/ volatile\u9632\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f<br \/>\n    private Singleton() {} \/\/ \u79c1\u6709\u6784\u9020\u5668<br \/>\n    public static Singleton getInstance() {<br \/>\n        if (instance &#061;&#061; null) { \/\/ \u7b2c\u4e00\u6b21\u68c0\u67e5<br \/>\n            synchronized (Singleton.class) {<br \/>\n                if (instance &#061;&#061; null) { \/\/ \u7b2c\u4e8c\u6b21\u68c0\u67e5<br \/>\n                    instance &#061; new Singleton();<br \/>\n                }<br \/>\n            }<br \/>\n        }<br \/>\n        return instance;<br \/>\n    }<br 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