{"id":58407,"date":"2025-08-16T09:44:42","date_gmt":"2025-08-16T01:44:42","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/58407.html"},"modified":"2025-08-16T09:44:42","modified_gmt":"2025-08-16T01:44:42","slug":"%e3%80%8athinking-in-java%e3%80%8b%e8%af%bb%e4%b9%a6%e7%ac%94%e8%ae%b0-%e5%88%9d%e5%a7%8b%e5%8c%96%e4%b8%8e%e6%b8%85%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/58407.html","title":{"rendered":"\u300aThinking in Java\u300b\u8bfb\u4e66\u7b14\u8bb0---\u521d\u59cb\u5316\u4e0e\u6e05\u7406"},"content":{"rendered":"<p>\u00a0 \u00a0 \u00a0 \u00a0 \u968f\u7740\u8ba1\u7b97\u673a\u9769\u547d\u7684\u53d1\u5c55&#xff0c;\u201c\u4e0d\u5b89\u5168\u201d\u7684\u7f16\u7a0b\u65b9\u5f0f\u5df2\u9010\u6e10\u6210\u4e3a\u7f16\u7a0b\u4ee3\u4ef7\u9ad8\u6602\u7684\u4e3b\u56e0\u4e4b\u4e00\u3002<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u521d\u59cb\u5316\u673a\u5236\u6df1\u5ea6\u89e3\u6790<\/h3>\n<h4>1.1 \u6784\u9020\u5668\u6838\u5fc3\u539f\u7406<\/h4>\n<h5>1.1.1 \u6784\u9020\u5668\u672c\u8d28\u7279\u6027<\/h5>\n<ul>\n<li>\n<p>\u547d\u540d\u5f3a\u5236\u8981\u6c42&#xff1a;\u5fc5\u987b\u4e0e\u7c7b\u540d\u5b8c\u5168\u76f8\u540c&#xff08;\u5305\u62ec\u5927\u5c0f\u5199&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u65e0\u8fd4\u56de\u503c\u58f0\u660e&#xff1a;\u4e0d\u540c\u4e8evoid\u65b9\u6cd5&#xff0c;\u6784\u9020\u5668\u5b8c\u5168\u4e0d\u58f0\u660e\u8fd4\u56de\u7c7b\u578b<\/p>\n<\/li>\n<li>\n<p>\u9ed8\u8ba4\u6784\u9020\u5668\u89c4\u5219&#xff1a;<\/p>\n<p>class MyClass {<br \/>\n    \/\/ \u7f16\u8bd1\u5668\u81ea\u52a8\u6dfb\u52a0\u7684\u65e0\u53c2\u6784\u9020\u5668&#xff08;\u4ec5\u5f53\u6ca1\u6709\u663e\u5f0f\u5b9a\u4e49\u4efb\u4f55\u6784\u9020\u5668\u65f6&#xff09;<br \/>\n    MyClass() {}<br \/>\n}\n<\/li>\n<\/ul>\n<h5>1.1.2 \u6784\u9020\u5668\u91cd\u8f7d\u673a\u5236<\/h5>\n<p>class Person {<br \/>\n    String name;<br \/>\n    int age;<\/p>\n<p>    \/\/ \u6784\u9020\u56681<br \/>\n    Person() {<br \/>\n        this(&#034;Unknown&#034;, 18);  \/\/ \u6784\u9020\u5668\u59d4\u6258<br \/>\n    }<\/p>\n<p>    \/\/ \u6784\u9020\u56682<br \/>\n    Person(String name) {<br \/>\n        this(name, 18);<br \/>\n    }<\/p>\n<p>    \/\/ \u6784\u9020\u56683&#xff08;\u4e3b\u6784\u9020\u5668&#xff09;<br \/>\n    Person(String name, int age) {<br \/>\n        this.name &#061; name;<br \/>\n        this.age &#061; age;<br \/>\n    }<br \/>\n}<\/p>\n<h5>1.1.3 \u6784\u9020\u5668\u6267\u884c\u6d41\u7a0b<\/h5>\n<li>\n<p>\u5206\u914d\u5bf9\u8c61\u5185\u5b58\u7a7a\u95f4&#xff08;\u5806\u5185\u5b58&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u6267\u884c\u7236\u7c7b\u6784\u9020\u5668&#xff08;\u9012\u5f52\u5230Object&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u6309\u58f0\u660e\u987a\u5e8f\u521d\u59cb\u5316\u6210\u5458\u53d8\u91cf<\/p>\n<\/li>\n<li>\n<p>\u6267\u884c\u6784\u9020\u5668\u4e3b\u4f53\u4ee3\u7801<\/p>\n<\/li>\n<h4>1.2 \u53d8\u91cf\u521d\u59cb\u5316\u7b56\u7565<\/h4>\n<h5>1.2.1 \u6210\u5458\u53d8\u91cf\u521d\u59cb\u5316\u65b9\u5f0f\u5bf9\u6bd4<\/h5>\n<table>\n<tr>\u521d\u59cb\u5316\u65b9\u5f0f\u8bed\u6cd5\u793a\u4f8b\u6267\u884c\u65f6\u673a\u7279\u70b9<\/tr>\n<tbody>\n<tr>\n<td>\u58f0\u660e\u65f6\u521d\u59cb\u5316<\/td>\n<td>int x &#061; 10;<\/td>\n<td>\u6784\u9020\u5668\u4e4b\u524d<\/td>\n<td>\u7b80\u6d01\u76f4\u89c2<\/td>\n<\/tr>\n<tr>\n<td>\u6784\u9020\u5668\u521d\u59cb\u5316<\/td>\n<td>MyClass() { x &#061; 10; }<\/td>\n<td>\u6784\u9020\u5668\u6267\u884c\u65f6<\/td>\n<td>\u7075\u6d3b\u63a7\u5236<\/td>\n<\/tr>\n<tr>\n<td>\u521d\u59cb\u5316\u5757<\/td>\n<td>{ x &#061; 10; }<\/td>\n<td>\u6784\u9020\u5668\u4e4b\u524d&#xff0c;\u4e0e\u58f0\u660e\u987a\u5e8f\u76f8\u540c<\/td>\n<td>\u53ef\u5904\u7406\u590d\u6742\u903b\u8f91<\/td>\n<\/tr>\n<tr>\n<td>\u9759\u6001\u521d\u59cb\u5316<\/td>\n<td>static { sVar &#061; 5; }<\/td>\n<td>\u7c7b\u52a0\u8f7d\u65f6<\/td>\n<td>\u53ea\u6267\u884c\u4e00\u6b21<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5>1.2.2 \u521d\u59cb\u5316\u987a\u5e8f\u793a\u4f8b<\/h5>\n<p>class InitializationExample {<br \/>\n    \/\/ \u9759\u6001\u53d8\u91cf<br \/>\n    static int staticVar &#061; initStatic();<\/p>\n<p>    \/\/ \u9759\u6001\u521d\u59cb\u5316\u5757<br \/>\n    static {<br \/>\n        System.out.println(&#034;\u9759\u6001\u521d\u59cb\u5316\u5757&#034;);<br \/>\n    }<\/p>\n<p>    \/\/ \u5b9e\u4f8b\u53d8\u91cf<br \/>\n    int instanceVar &#061; initInstance();<\/p>\n<p>    \/\/ \u5b9e\u4f8b\u521d\u59cb\u5316\u5757<br \/>\n    {<br \/>\n        System.out.println(&#034;\u5b9e\u4f8b\u521d\u59cb\u5316\u5757&#034;);<br \/>\n    }<\/p>\n<p>    \/\/ \u6784\u9020\u5668<br \/>\n    InitializationExample() {<br \/>\n        System.out.println(&#034;\u6784\u9020\u5668&#034;);<br \/>\n    }<\/p>\n<p>    static int initStatic() {<br \/>\n        System.out.println(&#034;\u9759\u6001\u53d8\u91cf\u521d\u59cb\u5316&#034;);<br \/>\n        return 1;<br \/>\n    }<\/p>\n<p>    int initInstance() {<br \/>\n        System.out.println(&#034;\u5b9e\u4f8b\u53d8\u91cf\u521d\u59cb\u5316&#034;);<br \/>\n        return 2;<br \/>\n    }<br \/>\n}<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8f93\u51fa\u987a\u5e8f&#xff1a;\u9759\u6001\u53d8\u91cf\u521d\u59cb\u5316\u3001\u9759\u6001\u521d\u59cb\u5316\u5757\u3001\u5b9e\u4f8b\u53d8\u91cf\u521d\u59cb\u5316\u3001\u5b9e\u4f8b\u521d\u59cb\u5316\u5757\u3001\u6784\u9020\u5668<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u6e05\u7406\u673a\u5236\u6df1\u5ea6\u5256\u6790<\/h3>\n<h4>2.1 finalize()\u65b9\u6cd5\u8be6\u89e3<\/h4>\n<h5>2.1.1 \u65b9\u6cd5\u7279\u6027<\/h5>\n<p>protected void finalize() throws Throwable {<br \/>\n    \/\/ \u6e05\u7406\u975e\u5185\u5b58\u8d44\u6e90<br \/>\n    super.finalize();  \/\/ \u8c03\u7528\u7236\u7c7bfinalizer<br \/>\n}<\/p>\n<h5>2.1.2 \u6267\u884c\u673a\u5236<\/h5>\n<li>\n<p>\u89e6\u53d1\u6761\u4ef6&#xff1a;\u5bf9\u8c61\u88abGC\u5224\u5b9a\u4e3a\u4e0d\u53ef\u8fbe\u65f6<\/p>\n<\/li>\n<li>\n<p>\u6267\u884c\u7ebf\u7a0b&#xff1a;\u7531Finalizer\u5b88\u62a4\u7ebf\u7a0b\u6267\u884c&#xff08;\u4f18\u5148\u7ea7\u4f4e&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u6267\u884c\u4fdd\u8bc1&#xff1a;\u4e0d\u4fdd\u8bc1\u4e00\u5b9a\u4f1a\u6267\u884c&#xff08;\u7a0b\u5e8f\u53ef\u80fd\u63d0\u524d\u7ec8\u6b62&#xff09;<\/p>\n<\/li>\n<h5>2.1.3 \u5178\u578b\u4f7f\u7528\u573a\u666f<\/h5>\n<ul>\n<li>\n<p>\u6e05\u7406\u672c\u5730\u65b9\u6cd5\u5206\u914d\u7684\u5185\u5b58&#xff08;JNI&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u4f5c\u4e3a\u8d44\u6e90\u91ca\u653e\u7684\u6700\u540e\u4fdd\u969c&#xff08;\u5e94\u4f18\u5148\u4f7f\u7528try-with-resources&#xff09;<\/p>\n<\/li>\n<\/ul>\n<h4>2.2 \u5783\u573e\u56de\u6536\u673a\u5236<\/h4>\n<h5>2.2.1 GC\u7b97\u6cd5\u6f14\u8fdb<\/h5>\n<table>\n<tr>\u7b97\u6cd5\u7c7b\u578bJDK\u7248\u672c\u7279\u70b9\u9002\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>\u6807\u8bb0-\u6e05\u9664<\/td>\n<td>\u65e9\u671f<\/td>\n<td>\u5185\u5b58\u788e\u7247\u5316<\/td>\n<td>\u7b80\u5355\u573a\u666f<\/td>\n<\/tr>\n<tr>\n<td>\u6807\u8bb0-\u6574\u7406<\/td>\n<td>1.2&#043;<\/td>\n<td>\u6d88\u9664\u788e\u7247<\/td>\n<td>\u8001\u5e74\u4ee3<\/td>\n<\/tr>\n<tr>\n<td>\u590d\u5236\u7b97\u6cd5<\/td>\n<td>1.3&#043;<\/td>\n<td>\u7a7a\u95f4\u6362\u65f6\u95f4<\/td>\n<td>\u65b0\u751f\u4ee3<\/td>\n<\/tr>\n<tr>\n<td>G1<\/td>\n<td>Java 7&#043;<\/td>\n<td>\u5206\u533a\u57df\u6536\u96c6<\/td>\n<td>\u5927\u5185\u5b58\u5e94\u7528<\/td>\n<\/tr>\n<tr>\n<td>ZGC<\/td>\n<td>Java 11&#043;<\/td>\n<td>\u4f4e\u5ef6\u8fdf<\/td>\n<td>\u5b9e\u65f6\u7cfb\u7edf<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5>2.2.2 \u5bf9\u8c61\u751f\u547d\u5468\u671f\u7ba1\u7406<\/h5>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"128\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816014440-689fe288834c5.png\" width=\"1249\" \/><\/p>\n<hr \/>\n<h3>\u4e09\u3001\u65b9\u6cd5\u91cd\u8f7d\u6df1\u5165\u63a2\u8ba8<\/h3>\n<h4>3.1 \u91cd\u8f7d\u89e3\u6790\u89c4\u5219<\/h4>\n<h5>3.1.1 \u5339\u914d\u4f18\u5148\u7ea7<\/h5>\n<li>\n<p>\u7cbe\u786e\u7c7b\u578b\u5339\u914d<\/p>\n<\/li>\n<li>\n<p>\u57fa\u672c\u7c7b\u578b\u81ea\u52a8\u6269\u5c55&#xff08;char\u2192int\u2192long\u2192float\u2192double&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u5305\u88c5\u7c7b\u578b\u81ea\u52a8\u88c5\u7bb1<\/p>\n<\/li>\n<li>\n<p>\u53ef\u53d8\u53c2\u6570\u5339\u914d<\/p>\n<\/li>\n<h5>3.1.2 \u5178\u578b\u6b67\u4e49\u573a\u666f<\/h5>\n<p>void f(int a, long b) {}<br \/>\nvoid f(long a, int b) {}<\/p>\n<p>f(1, 1);  \/\/ \u7f16\u8bd1\u9519\u8bef&#xff01;\u6a21\u7cca\u8c03\u7528<\/p>\n<h4>3.2 \u53ef\u53d8\u53c2\u6570\u673a\u5236<\/h4>\n<h5>3.2.1 \u5e95\u5c42\u5b9e\u73b0<\/h5>\n<p>\/\/ \u6e90\u4ee3\u7801<br \/>\nvoid printAll(String&#8230; args) {<br \/>\n    for (String s : args) System.out.println(s);<br \/>\n}<\/p>\n<p>\/\/ \u7f16\u8bd1\u540e\u7b49\u4ef7\u4e8e<br \/>\nvoid printAll(String[] args) {&#8230;}<\/p>\n<h5>3.2.2 \u4f7f\u7528\u89c4\u8303<\/h5>\n<ul>\n<li>\n<p>\u5fc5\u987b\u4f5c\u4e3a\u6700\u540e\u4e00\u4e2a\u53c2\u6570<\/p>\n<\/li>\n<li>\n<p>\u4e00\u4e2a\u65b9\u6cd5\u53ea\u80fd\u6709\u4e00\u4e2a\u53ef\u53d8\u53c2\u6570<\/p>\n<\/li>\n<li>\n<p>\u8c03\u7528\u65f6\u53ef\u4f20\u5165&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u591a\u4e2a\u5355\u72ec\u53c2\u6570&#xff1a;printAll(&#034;a&#034;, &#034;b&#034;)<\/p>\n<\/li>\n<li>\n<p>\u6570\u7ec4&#xff1a;printAll(new String[]{&#034;a&#034;, &#034;b&#034;})<\/p>\n<\/li>\n<li>\n<p>\u65e0\u53c2\u6570&#xff1a;printAll()<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u56db\u3001this\u5173\u952e\u5b57\u5168\u9762\u89e3\u6790<\/h3>\n<h4>4.1 \u6838\u5fc3\u4f5c\u7528\u573a\u666f<\/h4>\n<h5>4.1.1 \u89e3\u51b3\u547d\u540d\u51b2\u7a81<\/h5>\n<p>class MyClass {<br \/>\n    int value;<\/p>\n<p>    void setValue(int value) {<br \/>\n        this.value &#061; value;  \/\/ \u660e\u786e\u533a\u5206\u6210\u5458\u53d8\u91cf\u548c\u53c2\u6570<br \/>\n    }<br \/>\n}<\/p>\n<h5>4.1.2 \u6784\u9020\u5668\u94fe\u5f0f\u8c03\u7528<\/h5>\n<p>class Person {<br \/>\n    String name;<br \/>\n    int age;<\/p>\n<p>    Person() {<br \/>\n        this(&#034;Unknown&#034;);  \/\/ \u8c03\u7528\u53e6\u4e00\u4e2a\u6784\u9020\u5668<br \/>\n    }<\/p>\n<p>    Person(String name) {<br \/>\n        this(name, 18);<br \/>\n    }<\/p>\n<p>    Person(String name, int age) {<br \/>\n        this.name &#061; name;<br \/>\n        this.age &#061; age;<br \/>\n    }<br \/>\n}<\/p>\n<h4>4.2 \u5185\u5b58\u6a21\u578b\u89c6\u89d2<\/h4>\n<p>MyClass obj &#061; new MyClass();<br \/>\nobj.method();<\/p>\n<p>\u5b9e\u9645\u6267\u884c\u8fc7\u7a0b&#xff1a;<\/p>\n<li>\n<p>\u7f16\u8bd1\u5668\u5c06obj.method()\u8f6c\u6362\u4e3aMyClass.method(obj)<\/p>\n<\/li>\n<li>\n<p>this\u53c2\u6570\u5728\u8c03\u7528\u65f6\u9690\u5f0f\u4f20\u9012&#xff08;\u7c7b\u4f3cPython\u7684self&#xff09;<\/p>\n<\/li>\n<hr \/>\n<h3>\u4e94\u3001static\u521d\u59cb\u5316\u7ec6\u8282<\/h3>\n<h4>5.1 \u7c7b\u52a0\u8f7d\u521d\u59cb\u5316\u6d41\u7a0b<\/h4>\n<li>\n<p>\u52a0\u8f7d.class\u6587\u4ef6<\/p>\n<\/li>\n<li>\n<p>\u9a8c\u8bc1\u5b57\u8282\u7801<\/p>\n<\/li>\n<li>\n<p>\u51c6\u5907\u9636\u6bb5&#xff08;\u4e3astatic\u53d8\u91cf\u5206\u914d\u7a7a\u95f4\u5e76\u8bbe\u9ed8\u8ba4\u503c&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u89e3\u6790\u7b26\u53f7\u5f15\u7528<\/p>\n<\/li>\n<li>\n<p>\u521d\u59cb\u5316&#xff08;\u6267\u884cstatic\u5757\u548cstatic\u53d8\u91cf\u8d4b\u503c&#xff09;<\/p>\n<\/li>\n<h4>5.2 \u9759\u6001\u5b58\u50a8\u533a\u7279\u6027<\/h4>\n<table>\n<tr>\u7279\u6027\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>\u751f\u547d\u5468\u671f<\/td>\n<td>\u4ece\u7c7b\u52a0\u8f7d\u5230JVM\u5173\u95ed<\/td>\n<\/tr>\n<tr>\n<td>\u7ebf\u7a0b\u5b89\u5168<\/td>\n<td>\u7c7b\u52a0\u8f7d\u9636\u6bb5\u7531JVM\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168<\/td>\n<\/tr>\n<tr>\n<td>\u5185\u5b58\u4f4d\u7f6e<\/td>\n<td>JDK7\u524d\u5728\u6c38\u4e45\u4ee3&#xff0c;JDK8&#043;\u5728\u5143\u7a7a\u95f4<\/td>\n<\/tr>\n<tr>\n<td>\u56de\u6536\u6761\u4ef6<\/td>\n<td>\u7c7b\u52a0\u8f7d\u5668\u88ab\u56de\u6536\u65f6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>\u516d\u3001\u679a\u4e3e\u7c7b\u578b\u521d\u59cb\u5316<\/h3>\n<h4>6.1 \u679a\u4e3e\u7f16\u8bd1\u539f\u7406<\/h4>\n<p>\/\/ \u6e90\u4ee3\u7801<br \/>\nenum Color { RED, GREEN, BLUE }<\/p>\n<p>\/\/ \u7f16\u8bd1\u5668\u751f\u6210\u7c7b\u4f3c<br \/>\nfinal class Color extends Enum&lt;Color&gt; {<br \/>\n    public static final Color RED &#061; new Color();<br \/>\n    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