{"id":160,"date":"2025-08-16T02:10:18","date_gmt":"2025-08-15T18:10:18","guid":{"rendered":"http:\/\/192.140.166.102\/?p=160"},"modified":"2025-08-29T12:26:00","modified_gmt":"2025-08-29T04:26:00","slug":"%e5%85%ab%e8%82%a1%e6%95%b4%e7%90%86-javase%e9%83%a8%e5%88%86","status":"publish","type":"post","link":"https:\/\/lsuccess.xyz\/index.php\/2025\/08\/16\/%e5%85%ab%e8%82%a1%e6%95%b4%e7%90%86-javase%e9%83%a8%e5%88%86\/","title":{"rendered":"\u516b\u80a1\u6574\u7406-JavaSE\u90e8\u5206"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/javabetter.cn\/sidebar\/sanfene\/javase.html#_2-java-%E8%AF%AD%E8%A8%80%E6%9C%89%E5%93%AA%E4%BA%9B%E7%89%B9%E7%82%B9\">.<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1.Java\u8bed\u8a00\u6709\u4ec0\u4e48\u7279\u70b9<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9762\u5411\u5bf9\u8c61\u4e0e\u8fc7\u7a0b<\/li>\n\n\n\n<li>\u5e73\u53f0\u65e0\u5173\u6027\uff0c\u5176\u5173\u952e\u5728\u4e8eJVM\u5728\u4e0d\u540c\u5e73\u53f0\u4e0a\u5c06\u5b57\u8282\u7801\u7ffb\u8bd1\u6210\u4e0d\u540c\u7684\u673a\u68b0\u7801<\/li>\n\n\n\n<li>\u652f\u6301\u591a\u7ebf\u7a0b<\/li>\n\n\n\n<li>\u652f\u6301 JIT \u7f16\u8bd1\uff0c\u4e5f\u5c31\u662f\u5373\u65f6\u7f16\u8bd1\u5668\uff0c\u5b83\u53ef\u4ee5\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u5c06\u5b57\u8282\u7801\u8f6c\u6362\u4e3a\u70ed\u70b9\u673a\u5668\u7801\u6765\u63d0\u9ad8\u7a0b\u5e8f\u7684\u8fd0\u884c\u901f\u5ea6<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">2.JVM,JRE,JDK\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>JVM\u662fJava\u865a\u62df\u673a\uff0c\u8d1f\u8d23\u5c06\u7f16\u8bd1\u597d\u7684\u5b57\u8282\u7801\u6587\u4ef6\u8f6c\u6362\u6210\u5bf9\u5e94\u5e73\u53f0\u7684\u673a\u68b0\u7801\uff0c\u4e5f\u5c31\u5b9e\u73b0\u4e86JAVA\u7684\u8de8\u5e73\u53f0\u7279\u70b9<\/li>\n\n\n\n<li>JRE\u662f Java \u8fd0\u884c\u65f6\u73af\u5883\uff0c\u5305\u542b\u4e86\u8fd0\u884c Java \u7a0b\u5e8f\u6240\u5fc5\u9700\u7684\u5e93\uff0c\u4ee5\u53ca JVM\u3002<\/li>\n\n\n\n<li>JDK\u5305\u62ec JRE\uff0c\u7f16\u8bd1\u5668 JAVAC\u3001JAVA\u6587\u6863\u751f\u6210\u5de5\u5177 JAVADOC\u3001JAVA \u5b57\u8282\u7801\u5de5\u5177 JAVAP \u7b49\u3002\u4e3a\u5f00\u53d1\u8005\u63d0\u4f9b\u4e86\u5f00\u53d1\u3001\u7f16\u8bd1\u3001\u8c03\u8bd5 Java \u7a0b\u5e8f\u7684\u4e00\u6574\u5957\u73af\u5883\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">3.\u8bf4\u8bf4\u4ec0\u4e48\u662f\u8de8\u5e73\u53f0\uff1f\u539f\u7406\u662f\u4ec0\u4e48<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u8c13\u7684\u8de8\u5e73\u53f0\uff0c\u662f\u6307 Java \u8bed\u8a00\u7f16\u5199\u7684\u7a0b\u5e8f\uff0c\u4e00\u6b21\u7f16\u8bd1\u540e\uff0c\u53ef\u4ee5\u5728\u591a\u4e2a\u64cd\u4f5c\u7cfb\u7edf\u4e0a\u8fd0\u884c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u539f\u7406\u662f\u589e\u52a0\u4e86\u4e00\u4e2a\u4e2d\u95f4\u4ef6 JVM\uff0cJVM \u8d1f\u8d23\u5c06 Java \u5b57\u8282\u7801\u8f6c\u6362\u4e3a\u7279\u5b9a\u5e73\u53f0\u7684\u673a\u5668\u7801\uff0c\u5e76\u6267\u884c<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4.\u4ec0\u4e48\u662f\u5b57\u8282\u7801\uff1f\u91c7\u7528\u5b57\u8282\u7801\u7684\u597d\u5904\u662f\u4ec0\u4e48?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u8c13\u7684\u5b57\u8282\u7801\uff0c\u5c31\u662f Java \u7a0b\u5e8f\u7ecf\u8fc7\u7f16\u8bd1\u540e\u4ea7\u751f\u7684 .class \u6587\u4ef6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Java<\/strong>&nbsp;\u7a0b\u5e8f\u4ece\u6e90\u4ee3\u7801\u5230\u8fd0\u884c\u9700\u8981\u7ecf\u8fc7\u4e09\u6b65\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7f16\u8bd1<\/strong>\uff1a\u5c06\u6e90\u4ee3\u7801\u6587\u4ef6 .java \u7f16\u8bd1\u6210 JVM \u53ef\u4ee5\u8bc6\u522b\u7684\u5b57\u8282\u7801\u6587\u4ef6 .class<\/li>\n\n\n\n<li><strong>\u89e3\u91ca<\/strong>\uff1aJVM \u6267\u884c\u5b57\u8282\u7801\u6587\u4ef6\uff0c\u5c06\u5b57\u8282\u7801\u7ffb\u8bd1\u6210\u64cd\u4f5c\u7cfb\u7edf\u80fd\u8bc6\u522b\u7684\u673a\u5668\u7801<\/li>\n\n\n\n<li><strong>\u6267\u884c<\/strong>\uff1a\u64cd\u4f5c\u7cfb\u7edf\u6267\u884c\u4e8c\u8fdb\u5236\u7684\u673a\u5668\u7801<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u91c7\u7528\u5b57\u8282\u7801\u6587\u4ef6\u4f7f\u5f97JAVA\u7a0b\u5e8f\u80fd\u591fWrite once,Run anyway<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5.\u4e3a\u4ec0\u4e48\u6709\u4eba\u8bf4 Java \u662f\u201c\u7f16\u8bd1\u4e0e\u89e3\u91ca\u5e76\u5b58\u201d\u7684\u8bed\u8a00\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7f16\u8bd1\u578b\u8bed\u8a00\u662f\u6307\u7f16\u8bd1\u5668\u9488\u5bf9\u7279\u5b9a\u7684\u64cd\u4f5c\u7cfb\u7edf\uff0c\u5c06\u6e90\u4ee3\u7801\u4e00\u6b21\u6027\u7ffb\u8bd1\u6210\u53ef\u88ab\u8be5\u5e73\u53f0\u6267\u884c\u7684\u673a\u5668\u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u89e3\u91ca\u578b\u8bed\u8a00\u662f\u6307\u89e3\u91ca\u5668\u5bf9\u6e90\u4ee3\u7801\u8fdb\u884c\u9010\u884c\u89e3\u91ca\uff0c\u89e3\u91ca\u6210\u7279\u5b9a\u5e73\u53f0\u7684\u673a\u5668\u7801\u5e76\u6267\u884c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00a0Java \u662f\u201c\u7f16\u8bd1\u4e0e\u89e3\u91ca\u5e76\u5b58\u201d\u7684\u8bed\u8a00\uff0c\u662f\u56e0\u4e3a Java \u7a0b\u5e8f\u9700\u8981\u5148\u5c06 Java \u6e90\u4ee3\u7801\u6587\u4ef6\u7f16\u8bd1\u5b57\u8282\u7801\u6587\u4ef6\uff0c\u518d\u89e3\u91ca\u6267\u884c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">6.Java \u6709\u54ea\u4e9b\u6570\u636e\u7c7b\u578b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5927\u4f53\u4e0a\u5206\u4e3a\u4e24\u79cd\u7c7b\u578b\uff0c\u57fa\u672c\u6570\u636e\u7c7b\u578b\u548c\u5f15\u7528\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u57fa\u672c\u6570\u636e\u7c7b\u578b\u6709byte,char,short,int,long,float,double,boolean<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f15\u7528\u6570\u636e\u7c7b\u578b\u6709\u6570\u7ec4\uff0c\u6211\u4eec\u5b9a\u4e49\u7684\u7c7b\uff0c\u679a\u4e3e\u7b49<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7.\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\u3001\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u4e86\u89e3\u5417\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8ba1\u7b97\u8868\u8fbe\u5f0f\u7684\u65f6\u5019\uff0c\u4e24\u4e2a\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\u8fdb\u884c\u8fd0\u7b97\uff0c\u5176\u7ed3\u679c\u7684\u6570\u636e\u7c7b\u578b\u53d6\u51b3\u4e8e\u8fd0\u7b97\u4e2d\u6570\u636e\u8303\u56f4\u8868\u793a\u6700\u5927\u7684\u90a3\u4e00\u4e2a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u628a\u4e00\u4e2a\u8303\u56f4\u8f83\u5c0f\u7684\u6570\u503c\u6216\u53d8\u91cf\u8d4b\u7ed9\u53e6\u5916\u4e00\u4e2a\u8303\u56f4\u8f83\u5927\u7684\u53d8\u91cf\u65f6\uff0c\u4f1a\u8fdb\u884c\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\uff1b\u53cd\u4e4b\uff0c\u9700\u8981\u5f3a\u5236\u8f6c\u6362\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">8.\u4ec0\u4e48\u662f\u81ea\u52a8\u62c6\u7bb1\/\u88c5\u7bb1\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6d89\u53ca\u5230\u5305\u88c5\u7c7b\u548c\u5176\u5bf9\u5e94\u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u6211\u4eec\u5f15\u5165\u5305\u88c5\u7c7b\u4e00\u65b9\u9762\u662f\u4e3a\u4e86\u7b80\u5316\u6211\u4eec\u7684\u64cd\u4f5c\uff0c\u5305\u88c5\u7c7b\u4e2d\u6709\u5f88\u591a\u5df2\u7ecf\u5305\u88c5\u597d\u7684\u65b9\u6cd5\uff0c\u53e6\u4e00\u65b9\u9762\u662f\u5305\u88c5\u7c7b\u7684\u9ed8\u8ba4\u503c\u6709\u5176\u610f\u4e49<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u81ea\u52a8\u88c5\u7bb1\u5c31\u662fJVM\u81ea\u52a8\u5e2e\u6211\u4eec\u628aint\u7c7b\u578b\u8f6c\u6362\u6210Interger\uff0c\u4f7f\u7528\u7684\u662fInteger.valueOf()\uff0c\u5e76\u4e14\u5982\u679c\u8303\u56f4\u662f\u5728-128\u5230127\u4e4b\u95f4\u7684\u8bdd\uff0c\u5c31\u4e0d\u9700\u8981new\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u81ea\u52a8\u62c6\u7bb1\u65f6\uff0c\u7f16\u8bd1\u5668\u901a\u8fc7\u8c03\u7528\u7c7b\u4f3cintValue(),doubleValue()\u8fd9\u7c7b\u7684\u65b9\u6cd5\u5c06\u5bf9\u8c61\u8f6c\u6362\u6210\u539f\u59cb\u7c7b\u578b\u503c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">9.&amp;\u548c&amp;&amp;\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>&amp;<\/code>\u00a0\u662f\u00a0<code><strong>\u903b\u8f91\u4e0e<\/strong><\/code>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>&amp;&amp;<\/code>\u662f\u77ed\u8def\u4e0e\u8fd0\u7b97\u3002\u903b\u8f91\u4e0e\u8ddf\u77ed\u8def\u4e0e\u7684\u5dee\u522b\u662f\u975e\u5e38\u5927\u7684\uff0c\u867d\u7136\u4e8c\u8005\u90fd\u8981\u6c42\u8fd0\u7b97\u7b26\u5de6\u53f3\u4e24\u7aef\u7684\u5e03\u5c14\u503c\u90fd\u662f true\uff0c\u6574\u4e2a\u8868\u8fbe\u5f0f\u7684\u503c\u624d\u662f true\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>&amp;&amp;<\/code>\u4e4b\u6240\u4ee5\u79f0\u4e3a\u77ed\u8def\u8fd0\u7b97\u662f\u56e0\u4e3a\uff0c\u5982\u679c<code>&amp;&amp;<\/code>\u5de6\u8fb9\u7684\u8868\u8fbe\u5f0f\u7684\u503c\u662f false\uff0c\u53f3\u8fb9\u7684\u8868\u8fbe\u5f0f\u4f1a\u76f4\u63a5\u77ed\u8def\u6389\uff0c\u4e0d\u4f1a\u8fdb\u884c\u8fd0\u7b97\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">10.break,continue,return \u7684\u533a\u522b\u53ca\u4f5c\u7528\uff1f<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>break \u8df3\u51fa\u6574\u4e2a\u5faa\u73af\uff0c\u4e0d\u518d\u6267\u884c\u5faa\u73af(<strong>\u7ed3\u675f\u5f53\u524d\u7684\u5faa\u73af\u4f53<\/strong>)<\/li>\n\n\n\n<li>continue \u8df3\u51fa\u672c\u6b21\u5faa\u73af\uff0c\u7ee7\u7eed\u6267\u884c\u4e0b\u6b21\u5faa\u73af(<strong>\u7ed3\u675f\u6b63\u5728\u6267\u884c\u7684\u5faa\u73af \u8fdb\u5165\u4e0b\u4e00\u4e2a\u5faa\u73af\u6761\u4ef6<\/strong>)<\/li>\n\n\n\n<li>return \u7a0b\u5e8f\u8fd4\u56de\uff0c\u4e0d\u518d\u6267\u884c\u4e0b\u9762\u7684\u4ee3\u7801(<strong>\u7ed3\u675f\u5f53\u524d\u7684\u65b9\u6cd5 \u76f4\u63a5\u8fd4\u56de<\/strong>)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">11.\u7528\u6548\u7387\u6700\u9ad8\u7684\u65b9\u6cd5\u8ba1\u7b97 2 \u4e58\u4ee5 8\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f4d\u8fd0\u7b97\u5373\u53ef\uff0c\u5de6\u79fb\u662f\u4e58\u4ee52\u7684\u76f8\u5bf9\u5e94\u6b21\u65b9\u500d\uff0c\u53f3\u79fb\u5c31\u662f\u9664\u4ee5<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">12.float \u662f\u600e\u4e48\u8868\u793a\u5c0f\u6570\u7684\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8be6\u60c5\u89c1\u8ba1\u7b97\u673a\u7ec4\u6210\u539f\u7406\u4e2d\u768432\u4f4d\u6d6e\u70b9\u6570\u8868\u793a\u6cd5<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">13.\u8bb2\u4e00\u4e0b\u6570\u636e\u51c6\u786e\u6027\u9ad8\u662f\u600e\u4e48\u4fdd\u8bc1\u7684\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u91d1\u878d\u8ba1\u7b97\u4e2d\uff0c\u4fdd\u8bc1\u6570\u636e\u51c6\u786e\u6027\u6709\u4e24\u79cd\u65b9\u6848\uff0c\u4e00\u79cd\u4f7f\u7528&nbsp;<code>BigDecimal<\/code>\uff0c\u4e00\u79cd\u5c06\u6d6e\u70b9\u6570\u8f6c\u6362\u4e3a\u6574\u6570 int \u8fdb\u884c\u8ba1\u7b97\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u80af\u5b9a\u4e0d\u80fd\u4f7f\u7528&nbsp;<code>float<\/code>&nbsp;\u548c&nbsp;<code>double<\/code>&nbsp;\u7c7b\u578b\uff0c\u5b83\u4eec\u65e0\u6cd5\u907f\u514d\u6d6e\u70b9\u6570\u8fd0\u7b97\u4e2d\u5e38\u89c1\u7684\u7cbe\u5ea6\u95ee\u9898\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u6570\u636e\u7c7b\u578b\u91c7\u7528\u4e8c\u8fdb\u5236\u6d6e\u70b9\u6570\u6765\u8868\u793a\uff0c\u65e0\u6cd5\u51c6\u786e\u5730\u8868\u793a\uff0c\u4f8b\u5982&nbsp;<code>0.1<\/code>\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">14.\u2faf\u5411\u5bf9\u8c61\u548c\u2faf\u5411\u8fc7\u7a0b\u7684\u533a\u522b?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9762\u5411\u8fc7\u7a0b\u662f\u4ee5\u8fc7\u7a0b\u4e3a\u6838\u5fc3\uff0c\u901a\u8fc7\u51fd\u6570\u5b8c\u6210\u4efb\u52a1\uff0c\u7a0b\u5e8f\u7ed3\u6784\u662f\u51fd\u6570+\u6b65\u9aa4\u7ec4\u6210\u7684\u987a\u5e8f\u6d41\u7a0b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9762\u5411\u5bf9\u8c61\u662f\u4ee5\u5bf9\u8c61\u4e3a\u6838\u5fc3\uff0c\u901a\u8fc7\u5bf9\u8c61\u4ea4\u4e92\u5b8c\u6210\u4efb\u52a1\uff0c\u7a0b\u5e8f\u7ed3\u6784\u662f\u7c7b\u548c\u5bf9\u8c61\u7ec4\u6210\u7684\u6a21\u5757\u5316\u7ed3\u6784\uff0c\u4ee3\u7801\u53ef\u4ee5\u901a\u8fc7\u7ee7\u627f\u3001\u7ec4\u5408\u3001\u591a\u6001\u7b49\u65b9\u5f0f\u590d\u7528\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">15.\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u6709\u54ea\u4e9b\u7279\u6027\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u6709\u4e09\u5927\u7279\u6027\uff1a\u5c01\u88c5\u3001\u7ee7\u627f\u3001\u591a\u6001\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c01\u88c5\u662f\u6307\u5c06\u6570\u636e\uff08\u5c5e\u6027\uff0c\u6216\u8005\u53eb\u5b57\u6bb5\uff09\u548c\u64cd\u4f5c\u6570\u636e\u7684\u65b9\u6cd5\uff08\u884c\u4e3a\uff09\u6346\u7ed1\u5728\u4e00\u8d77\uff0c\u5f62\u6210\u4e00\u4e2a\u72ec\u7acb\u7684\u5bf9\u8c61\uff0c\u53ea\u5bf9\u5916\u5f00\u53d1\u4e00\u4e2a\u8bbf\u95ee\u7528\u7684\u63a5\u53e3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ee7\u627f\u5141\u8bb8\u4e00\u4e2a\u7c7b\uff08\u5b50\u7c7b\uff09\u7ee7\u627f\u73b0\u6709\u7c7b\uff08\u7236\u7c7b\u6216\u8005\u57fa\u7c7b\uff09\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u590d\u7528\u6027\uff0c\u5efa\u7acb\u7c7b\u4e4b\u95f4\u7684\u5c42\u6b21\u5173\u7cfb\uff0c\u5b50\u7c7b\u8fd8\u53ef\u4ee5\u91cd\u5199\u6216\u8005\u6269\u5c55\u4ece\u7236\u7c7b\u7ee7\u627f\u6765\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff0c\u4ece\u800c\u5b9e\u73b0\u591a\u6001<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u591a\u6001\u6307\u540c\u4e00\u4e2a\u63a5\u53e3\u6216\u65b9\u6cd5\u5728\u4e0d\u540c\u7684\u7c7b\u4e2d\u6709\u4e0d\u540c\u7684\u5b9e\u73b0\uff0c\u6bd4\u5982\u8bf4\u52a8\u6001\u7ed1\u5b9a\uff0c\u7236\u7c7b\u5f15\u7528\u6307\u5411\u5b50\u7c7b\u5bf9\u8c61\uff0c\u65b9\u6cd5\u7684\u5177\u4f53\u8c03\u7528\u4f1a\u5ef6\u8fdf\u5230\u8fd0\u884c\u65f6\u51b3\u5b9a\uff0c\u5176\u5b9e\u73b0\u539f\u7406\u662f\u52a8\u6001\u7ed1\u5b9a<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">16.\u91cd\u8f7d\u548c\u91cd\u5199\u7684\u533a\u522b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e00\u4e2a\u7c7b\u6709\u591a\u4e2a\u540d\u5b57\u76f8\u540c\u4f46\u53c2\u6570\u4e2a\u6570\u4e0d\u540c\u7684\u65b9\u6cd5\uff0c\u6211\u4eec\u901a\u5e38\u79f0\u8fd9\u4e9b\u65b9\u6cd5\u4e3a\u65b9\u6cd5\u91cd\u8f7d\uff08overload\uff09\u3002\u5982\u679c\u65b9\u6cd5\u7684\u529f\u80fd\u662f\u4e00\u6837\u7684\uff0c\u4f46\u53c2\u6570\u4e0d\u540c\uff0c\u4f7f\u7528\u76f8\u540c\u7684\u540d\u5b57\u53ef\u4ee5\u63d0\u9ad8\u7a0b\u5e8f\u7684\u53ef\u8bfb\u6027\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5b50\u7c7b\u5177\u6709\u548c\u7236\u7c7b\u4e00\u6837\u7684\u65b9\u6cd5\uff08\u53c2\u6570\u76f8\u540c\u3001\u8fd4\u56de\u7c7b\u578b\u76f8\u540c\u3001\u65b9\u6cd5\u540d\u76f8\u540c\uff0c\u4f46\u65b9\u6cd5\u4f53\u53ef\u80fd\u4e0d\u540c\uff09\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a\u65b9\u6cd5\u91cd\u5199\uff08override\uff09\u3002\u65b9\u6cd5\u91cd\u5199\u7528\u4e8e\u63d0\u4f9b\u7236\u7c7b\u5df2\u7ecf\u58f0\u660e\u7684\u65b9\u6cd5\u7684\u7279\u6b8a\u5b9e\u73b0\uff0c\u662f\u5b9e\u73b0\u591a\u6001\u7684\u57fa\u7840\u6761\u4ef6\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">17.\u8bbf\u95ee\u4fee\u9970\u7b26 public\u3001private\u3001protected\u3001\u4ee5\u53ca\u9ed8\u8ba4\u65f6\u7684\u533a\u522b\uff1f<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>default<\/strong>\u00a0\uff08\u5373\u9ed8\u8ba4\uff0c\u4ec0\u4e48\u4e5f\u4e0d\u5199\uff09: \u5728\u540c\u4e00\u5305\u5185\u53ef\u89c1\uff0c\u4e0d\u4f7f\u7528\u4efb\u4f55\u4fee\u9970\u7b26\u3002\u53ef\u4ee5\u4fee\u9970\u5728\u7c7b\u3001\u63a5\u53e3\u3001\u53d8\u91cf\u3001\u65b9\u6cd5\u3002<\/li>\n\n\n\n<li><strong>private<\/strong>\u00a0: \u5728\u540c\u4e00\u7c7b\u5185\u53ef\u89c1\u3002\u53ef\u4ee5\u4fee\u9970\u53d8\u91cf\u3001\u65b9\u6cd5\u3002<strong>\u6ce8\u610f\uff1a\u4e0d\u80fd\u4fee\u9970\u7c7b\uff08\u5916\u90e8\u7c7b\uff09<\/strong><\/li>\n\n\n\n<li><strong>public<\/strong>\u00a0: \u5bf9\u6240\u6709\u7c7b\u53ef\u89c1\u3002\u53ef\u4ee5\u4fee\u9970\u7c7b\u3001\u63a5\u53e3\u3001\u53d8\u91cf\u3001\u65b9\u6cd5<\/li>\n\n\n\n<li><strong>protected<\/strong>\u00a0: \u5bf9\u540c\u4e00\u5305\u5185\u7684\u7c7b\u548c\u6240\u6709\u5b50\u7c7b\u53ef\u89c1\u3002\u53ef\u4ee5\u4fee\u9970\u53d8\u91cf\u3001\u65b9\u6cd5\u3002<strong>\u6ce8\u610f\uff1a\u4e0d\u80fd\u4fee\u9970\u7c7b\uff08\u5916\u90e8\u7c7b\uff09<\/strong><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">18.\u62bd\u8c61\u7c7b\u548c\u63a5\u53e3\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u7ee7\u627f\u4e0a\u770b\uff0c\u62bd\u8c61\u7c7b\u4e0d\u80fd\u591a\u7ee7\u627f\uff0c\u63a5\u53e3\u53ef\u4ee5\u591a\u7ee7\u627f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u6784\u9020\u65b9\u6cd5\u4e0a\u6765\u770b\uff0c\u62bd\u8c61\u7c7b\u53ef\u4ee5\u6709\u6784\u9020\u65b9\u6cd5\uff0c\u4f46\u5176\u662f\u4e0d\u80fd\u5b9e\u4f8b\u5316\u7684\uff0c\u53ea\u80fd\u7531\u7ee7\u627f\u7684\u5b50\u7c7b\u5b9e\u4f8b\u5316\uff0c\u63a5\u53e3\u662f\u6ca1\u6709\u6784\u9020\u65b9\u6cd5\u7684<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u62bd\u8c61\u7c7b\u4f7f\u7528 abstract \u5173\u952e\u5b57\u5b9a\u4e49\uff0c\u4e0d\u80fd\u88ab\u5b9e\u4f8b\u5316\uff0c\u53ea\u80fd\u4f5c\u4e3a\u5176\u4ed6\u7c7b\u7684\u7236\u7c7b\u3002\u666e\u901a\u7c7b\u6ca1\u6709 abstract \u5173\u952e\u5b57\uff0c\u53ef\u4ee5\u76f4\u63a5\u5b9e\u4f8b\u5316\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b64\u5916\u62bd\u8c61\u7c7b\u53ef\u4ee5\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\u548c\u975e\u62bd\u8c61\u65b9\u6cd5\u3002\u62bd\u8c61\u65b9\u6cd5\u6ca1\u6709\u65b9\u6cd5\u4f53\uff0c\u5fc5\u987b\u7531\u5b50\u7c7b\u5b9e\u73b0\u3002\u666e\u901a\u7c7b\u53ea\u80fd\u5305\u542b\u975e\u62bd\u8c61\u65b9\u6cd5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">19.\u6210\u5458\u53d8\u91cf\u4e0e\u5c40\u90e8\u53d8\u91cf\u7684\u533a\u522b\u6709\u54ea\u4e9b\uff1f<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4ece\u8bed\u6cd5\u5f62\u5f0f\u4e0a\u770b<\/strong>\uff1a\u6210\u5458\u53d8\u91cf\u662f\u5c5e\u4e8e\u7c7b\u7684\uff0c\u2f7d\u5c40\u90e8\u53d8\u91cf\u662f\u5728\u2f45\u6cd5\u4e2d\u5b9a\u4e49\u7684\u53d8\u91cf\u6216\u662f\u2f45\u6cd5\u7684\u53c2\u6570\uff1b\u6210\u5458\u53d8\u91cf\u53ef\u4ee5\u88ab public , private , static \u7b49\u4fee\u9970\u7b26\u6240\u4fee\u9970\uff0c\u2f7d\u5c40\u90e8\u53d8\u91cf\u4e0d\u80fd\u88ab\u8bbf\u95ee\u63a7\u5236\u4fee\u9970\u7b26\u53ca static \u6240\u4fee\u9970\uff1b\u4f46\u662f\uff0c\u6210\u5458\u53d8\u91cf\u548c\u5c40\u90e8\u53d8\u91cf\u90fd\u80fd\u88ab final \u6240\u4fee\u9970\u3002<\/li>\n\n\n\n<li><strong>\u4ece\u53d8\u91cf\u5728\u5185\u5b58\u4e2d\u7684\u5b58\u50a8\u2f45\u5f0f\u6765\u770b<\/strong>\uff1a\u5982\u679c\u6210\u5458\u53d8\u91cf\u662f\u4f7f\u2f64 static \u4fee\u9970\u7684\uff0c\u90a3\u4e48\u8fd9\u4e2a\u6210\u5458\u53d8\u91cf\u662f\u5c5e\u4e8e\u7c7b\u7684\uff0c\u5982\u679c\u6ca1\u6709\u4f7f\u2f64 static \u4fee\u9970\uff0c\u8fd9\u4e2a\u6210\u5458\u53d8\u91cf\u662f\u5c5e\u4e8e\u5b9e\u4f8b\u7684\u3002\u5bf9\u8c61\u5b58\u4e8e\u5806\u5185\u5b58\uff0c\u5982\u679c\u5c40\u90e8\u53d8\u91cf\u7c7b\u578b\u4e3a\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u90a3\u4e48\u5b58\u50a8\u5728\u6808\u5185\u5b58\uff0c\u5982\u679c\u4e3a\u5f15\u2f64\u6570\u636e\u7c7b\u578b\uff0c\u90a3\u5b58\u653e\u7684\u662f\u6307\u5411\u5806\u5185\u5b58\u5bf9\u8c61\u7684\u5f15\u2f64\u6216\u8005\u662f\u6307\u5411\u5e38\u91cf\u6c60\u4e2d\u7684\u5730\u5740\u3002<\/li>\n\n\n\n<li><strong>\u4ece\u53d8\u91cf\u5728\u5185\u5b58\u4e2d\u7684\u2f63\u5b58\u65f6\u95f4\u4e0a\u770b<\/strong>\uff1a\u6210\u5458\u53d8\u91cf\u662f\u5bf9\u8c61\u7684\u2f00\u90e8\u5206\uff0c\u5b83\u968f\u7740\u5bf9\u8c61\u7684\u521b\u5efa\u2f7d\u5b58\u5728\uff0c\u2f7d\u5c40\u90e8\u53d8\u91cf\u968f\u7740\u2f45\u6cd5\u7684\u8c03\u2f64\u2f7d\u2f83\u52a8\u6d88\u5931\u3002<\/li>\n\n\n\n<li><strong>\u6210\u5458\u53d8\u91cf\u5982\u679c\u6ca1\u6709\u88ab\u8d4b\u521d\u503c<\/strong>\uff1a\u5219\u4f1a\u2f83\u52a8\u4ee5\u7c7b\u578b\u7684\u9ed8\u8ba4\u503c\u2f7d\u8d4b\u503c\uff08\u2f00\u79cd\u60c5\u51b5\u4f8b\u5916:\u88ab final \u4fee\u9970\u7684\u6210\u5458\u53d8\u91cf\u4e5f\u5fc5\u987b\u663e\u5f0f\u5730\u8d4b\u503c\uff09\uff0c\u2f7d\u5c40\u90e8\u53d8\u91cf\u5219\u4e0d\u4f1a\u2f83\u52a8\u8d4b\u503c<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">20.static \u5173\u952e\u5b57\u4e86\u89e3\u5417\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">static \u5173\u952e\u5b57\u53ef\u4ee5\u7528\u6765\u4fee\u9970\u53d8\u91cf\u3001\u65b9\u6cd5\u3001\u4ee3\u7801\u5757\u548c\u5185\u90e8\u7c7b\uff0c\u4ee5\u53ca\u5bfc\u5165\u5305<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u9759\u6001\u53d8\u91cf:<\/strong>&nbsp;\u662f\u88ab static \u4fee\u9970\u7b26\u4fee\u9970\u7684\u53d8\u91cf\uff0c\u4e5f\u79f0\u4e3a\u7c7b\u53d8\u91cf\uff0c\u5b83\u5c5e\u4e8e\u7c7b\uff0c\u4e0d\u5c5e\u4e8e\u7c7b\u7684\u4efb\u4f55\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4e00\u4e2a\u7c7b\u4e0d\u7ba1\u521b\u5efa\u591a\u5c11\u4e2a\u5bf9\u8c61\uff0c\u9759\u6001\u53d8\u91cf\u5728\u5185\u5b58\u4e2d\u6709\u4e14\u4ec5\u6709\u4e00\u4e2a\u526f\u672c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5b9e\u4f8b\u53d8\u91cf:<\/strong>&nbsp;\u5fc5\u987b\u4f9d\u5b58\u4e8e\u67d0\u4e00\u5b9e\u4f8b\uff0c\u9700\u8981\u5148\u521b\u5efa\u5bf9\u8c61\u7136\u540e\u901a\u8fc7\u5bf9\u8c61\u624d\u80fd\u8bbf\u95ee\u5230\u5b83\u3002\u9759\u6001\u53d8\u91cf\u53ef\u4ee5\u5b9e\u73b0\u8ba9\u591a\u4e2a\u5bf9\u8c61\u5171\u4eab\u5185\u5b58<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u9759\u6001\u65b9\u6cd5<\/strong>\uff1astatic \u4fee\u9970\u7684\u65b9\u6cd5\uff0c\u4e5f\u88ab\u79f0\u4e3a\u7c7b\u65b9\u6cd5\u3002\u5728\u5916\u90e8\u8c03\u2f64\u9759\u6001\u2f45\u6cd5\u65f6\uff0c\u53ef\u4ee5\u4f7f\u2f64&#8221;<strong>\u7c7b\u540d.\u2f45\u6cd5\u540d<\/strong>&#8220;\u7684\u2f45\u5f0f\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u2f64&#8221;<strong>\u5bf9\u8c61\u540d.\u2f45\u6cd5\u540d<\/strong>&#8220;\u7684\u2f45\u5f0f\u3002\u9759\u6001\u65b9\u6cd5\u91cc\u4e0d\u80fd\u8bbf\u95ee\u7c7b\u7684\u975e\u9759\u6001\u6210\u5458\u53d8\u91cf\u548c\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5b9e\u4f8b\u2f45\u6cd5<\/strong>\uff1a\u4f9d\u5b58\u4e8e\u7c7b\u7684\u5b9e\u4f8b\uff0c\u9700\u8981\u4f7f\u7528&#8221;<strong>\u5bf9\u8c61\u540d.\u2f45\u6cd5\u540d<\/strong>&#8220;\u7684\u2f45\u5f0f\u8c03\u7528\uff1b\u53ef\u4ee5\u8bbf\u95ee\u7c7b\u7684\u6240\u6709\u6210\u5458\u53d8\u91cf\u548c\u65b9\u6cd5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">21.final \u5173\u952e\u5b57\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53 final \u4fee\u9970\u4e00\u4e2a\u7c7b\u65f6\uff0c\u8868\u660e\u8fd9\u4e2a\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\u3002\u6bd4\u5982\uff0cString \u7c7b\u3001Integer \u7c7b\u548c\u5176\u4ed6\u5305\u88c5\u7c7b\u90fd\u662f\u7528 final \u4fee\u9970\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53 final \u4fee\u9970\u4e00\u4e2a\u65b9\u6cd5\u65f6\uff0c\u8868\u660e\u8fd9\u4e2a\u65b9\u6cd5\u4e0d\u80fd\u88ab\u91cd\u5199\uff08Override\uff09\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u4e00\u4e2a\u7c7b\u7ee7\u627f\u4e86\u67d0\u4e2a\u7c7b\uff0c\u5e76\u4e14\u60f3\u8981\u6539\u53d8\u7236\u7c7b\u4e2d\u88ab final \u4fee\u9970\u7684\u65b9\u6cd5\u7684\u884c\u4e3a\uff0c\u662f\u4e0d\u88ab\u5141\u8bb8\u7684<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53 final \u4fee\u9970\u4e00\u4e2a\u53d8\u91cf\u65f6\uff0c\u8868\u660e\u8fd9\u4e2a\u53d8\u91cf\u7684\u503c\u4e00\u65e6\u88ab\u521d\u59cb\u5316\u5c31\u4e0d\u80fd\u88ab\u4fee\u6539\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u662f\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u5176\u6570\u503c\u4e00\u65e6\u5728\u521d\u59cb\u5316\u4e4b\u540e\u5c31\u4e0d\u80fd\u66f4\u6539\uff1b\u5982\u679c\u662f\u5f15\u7528\u7c7b\u578b\u7684\u53d8\u91cf\uff0c\u5728\u5bf9\u5176\u521d\u59cb\u5316\u4e4b\u540e\u5c31\u4e0d\u80fd\u518d\u8ba9\u5176\u6307\u5411\u53e6\u4e00\u4e2a\u5bf9\u8c61<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">22.final\u3001finally\u3001finalize \u7684\u533a\u522b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">final \u662f\u4e00\u4e2a\u4fee\u9970\u7b26\uff0c\u53ef\u4ee5\u4fee\u9970\u7c7b\u3001\u65b9\u6cd5\u548c\u53d8\u91cf\u3002\u5f53 final \u4fee\u9970\u4e00\u4e2a\u7c7b\u65f6\uff0c\u8868\u660e\u8fd9\u4e2a\u7c7b\u4e0d\u80fd\u88ab\u7ee7\u627f\uff1b\u5f53 final \u4fee\u9970\u4e00\u4e2a\u65b9\u6cd5\u65f6\uff0c\u8868\u660e\u8fd9\u4e2a\u65b9\u6cd5\u4e0d\u80fd\u88ab\u91cd\u5199\uff1b\u5f53 final \u4fee\u9970\u4e00\u4e2a\u53d8\u91cf\u65f6\uff0c\u8868\u660e\u8fd9\u4e2a\u53d8\u91cf\u662f\u4e2a\u5e38\u91cf\uff0c\u4e00\u65e6\u8d4b\u503c\u540e\uff0c\u5c31\u4e0d\u80fd\u518d\u88ab\u4fee\u6539\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">finally \u662f Java \u4e2d\u5f02\u5e38\u5904\u7406\u7684\u4e00\u90e8\u5206\uff0c\u7528\u6765\u521b\u5efa try \u5757\u540e\u9762\u7684 finally \u5757\u3002\u65e0\u8bba try \u5757\u4e2d\u7684\u4ee3\u7801\u662f\u5426\u629b\u51fa\u5f02\u5e38\uff0cfinally \u5757\u4e2d\u7684\u4ee3\u7801\u603b\u662f\u4f1a\u88ab\u6267\u884c\u3002\u901a\u5e38\uff0cfinally \u5757\u88ab\u7528\u6765\u91ca\u653e\u8d44\u6e90\uff0c\u5982\u5173\u95ed\u6587\u4ef6\u3001\u6570\u636e\u5e93\u8fde\u63a5\u7b49\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">finalize \u662fObject \u7c7b\u7684\u4e00\u4e2a\u65b9\u6cd5\uff0c\u7528\u4e8e\u5728\u5783\u573e\u56de\u6536\u5668\u5c06\u5bf9\u8c61\u4ece\u5185\u5b58\u4e2d\u6e05\u9664\u51fa\u53bb\u4e4b\u524d\u505a\u4e00\u4e9b\u5fc5\u8981\u7684\u6e05\u7406\u5de5\u4f5c\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">23..==\u548c equals \u7684\u533a\u522b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 Java \u4e2d\uff0c<code>==<\/code>&nbsp;\u64cd\u4f5c\u7b26\u548c&nbsp;<code>equals()<\/code>&nbsp;\u65b9\u6cd5\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u5bf9\u8c61\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2460\u3001==\uff1a\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u5373\u5b83\u4eec\u662f\u5426\u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e24\u4e2a\u53d8\u91cf\u5f15\u7528\u540c\u4e00\u4e2a\u5bf9\u8c61\u5b9e\u4f8b\uff0c<code>==<\/code>&nbsp;\u8fd4\u56de&nbsp;<code>true<\/code>\uff0c\u5426\u5219\u8fd4\u56de&nbsp;<code>false<\/code>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff08\u5982&nbsp;<code>int<\/code>,&nbsp;<code>double<\/code>,&nbsp;<code>char<\/code>&nbsp;\u7b49\uff09\uff0c<code>==<\/code>&nbsp;\u6bd4\u8f83\u7684\u662f\u503c\u662f\u5426\u76f8\u7b49\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2461\u3001<strong>equals() \u65b9\u6cd5<\/strong>\uff1a\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u5bf9\u8c61\u7684\u5185\u5bb9\u662f\u5426\u76f8\u7b49\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c<code>equals()<\/code>\u00a0\u65b9\u6cd5\u7684\u884c\u4e3a\u4e0e\u00a0<code>==<\/code>\u00a0\u76f8\u540c\uff0c\u5373\u6bd4\u8f83\u5bf9\u8c61\u5f15\u7528<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">24.\u4e3a\u4ec0\u4e48\u91cd\u5199 equals \u65f6\u5fc5\u987b\u91cd\u5199 hashCode \u2f45\u6cd5\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a\u57fa\u4e8e\u54c8\u5e0c\u7684\u96c6\u5408\u7c7b\uff08\u5982 HashMap\uff09\u9700\u8981\u57fa\u4e8e\u8fd9\u4e00\u70b9\u6765\u6b63\u786e\u5b58\u50a8\u548c\u67e5\u627e\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5177\u4f53\u5730\u8bf4\uff0cHashMap \u901a\u8fc7\u5bf9\u8c61\u7684\u54c8\u5e0c\u7801\u5c06\u5176\u5b58\u50a8\u5728\u4e0d\u540c\u7684\u201c\u6876\u201d\u4e2d\uff0c\u5f53\u67e5\u627e\u5bf9\u8c61\u65f6\uff0c\u5b83\u9700\u8981\u4f7f\u7528 key \u7684\u54c8\u5e0c\u7801\u6765\u786e\u5b9a\u5bf9\u8c61\u5728\u54ea\u4e2a\u6876\u4e2d\uff0c\u7136\u540e\u518d\u901a\u8fc7&nbsp;<code>equals()<\/code>&nbsp;\u65b9\u6cd5\u627e\u5230\u5bf9\u5e94\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u91cd\u5199\u4e86\u00a0<code>equals()<\/code>\u65b9\u6cd5\u800c\u6ca1\u6709\u91cd\u5199\u00a0<code>hashCode()<\/code>\u65b9\u6cd5\uff0c\u90a3\u4e48\u88ab\u8ba4\u4e3a\u76f8\u7b49\u7684\u5bf9\u8c61\u53ef\u80fd\u4f1a\u6709\u4e0d\u540c\u7684\u54c8\u5e0c\u7801\uff0c\u4ece\u800c\u5bfc\u81f4\u65e0\u6cd5\u5728 HashMap \u4e2d\u6b63\u786e\u5904\u7406\u8fd9\u4e9b\u5bf9\u8c61<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e3b\u8981\u662f\u7531\u4e8e\u54c8\u5e0c\u7801\uff08hashCode\uff09\u7684\u672c\u8d28\u548c\u76ee\u7684\u6240\u51b3\u5b9a\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u54c8\u5e0c\u7801\u662f\u901a\u8fc7\u54c8\u5e0c\u51fd\u6570\u5c06\u5bf9\u8c61\u4e2d\u6620\u5c04\u6210\u4e00\u4e2a\u6574\u6570\u503c\uff0c\u5176\u4e3b\u8981\u76ee\u7684\u662f\u5728\u54c8\u5e0c\u8868\u4e2d\u5feb\u901f\u5b9a\u4f4d\u5bf9\u8c61\u7684\u5b58\u50a8\u4f4d\u7f6e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7531\u4e8e\u54c8\u5e0c\u51fd\u6570\u5c06\u4e00\u4e2a\u8f83\u5927\u7684\u8f93\u5165\u57df\u6620\u5c04\u5230\u4e00\u4e2a\u8f83\u5c0f\u7684\u8f93\u51fa\u57df\uff0c\u4e0d\u540c\u7684\u8f93\u5165\u503c\uff08\u5373\u4e0d\u540c\u7684\u5bf9\u8c61\uff09\u53ef\u80fd\u4f1a\u4ea7\u751f\u76f8\u540c\u7684\u8f93\u51fa\u503c\uff08\u5373\u76f8\u540c\u7684\u54c8\u5e0c\u7801\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u79cd\u60c5\u51b5\u88ab\u79f0\u4e3a\u54c8\u5e0c\u51b2\u7a81\u3002\u5f53\u4e24\u4e2a\u4e0d\u76f8\u7b49\u7684\u5bf9\u8c61\u53d1\u751f\u54c8\u5e0c\u51b2\u7a81\u65f6\uff0c\u5b83\u4eec\u4f1a\u6709\u76f8\u540c\u7684 hashCode\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4e86\u89e3\u51b3\u54c8\u5e0c\u51b2\u7a81\u7684\u95ee\u9898\uff0c\u54c8\u5e0c\u8868\u5728\u5904\u7406\u952e\u65f6\uff0c\u4e0d\u4ec5\u4f1a\u6bd4\u8f83\u952e\u5bf9\u8c61\u7684\u54c8\u5e0c\u7801\uff0c\u8fd8\u4f1a\u4f7f\u7528 equals \u65b9\u6cd5\u6765\u68c0\u67e5\u952e\u5bf9\u8c61\u662f\u5426\u771f\u6b63\u76f8\u7b49\u3002\u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u7684\u54c8\u5e0c\u7801\u76f8\u540c\uff0c\u4f46\u901a\u8fc7 equals \u65b9\u6cd5\u6bd4\u8f83\u7ed3\u679c\u4e3a false\uff0c\u90a3\u4e48\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u5c31\u4e0d\u88ab\u89c6\u4e3a\u76f8\u7b49\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">25.Java \u662f\u503c\u4f20\u9012\uff0c\u8fd8\u662f\u5f15\u7528\u4f20\u9012\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u662f\u503c\u4f20\u9012\uff0c\u4f20\u9012\u7684\u6307\u5411\u7684\u5730\u5740\u503c\uff0c\u5bf9\u4e8e\u5f15\u7528\u6570\u636e\u7c7b\u578b\u6765\u8bf4<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">26.\u8bf4\u8bf4\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\u7684\u533a\u522b?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6d45\u62f7\u8d1d\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u5bf9\u8c61\uff0c\u4f46\u8fd9\u4e2a\u65b0\u5bf9\u8c61\u7684\u5c5e\u6027\uff08\u5b57\u6bb5\uff09\u548c\u539f\u5bf9\u8c61\u7684\u5c5e\u6027\u5b8c\u5168\u76f8\u540c\u3002\u5982\u679c\u5c5e\u6027\u662f\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u62f7\u8d1d\u7684\u662f\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u503c\uff1b\u5982\u679c\u5c5e\u6027\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u62f7\u8d1d\u7684\u662f\u5f15\u7528\u5730\u5740\uff0c\u56e0\u6b64\u65b0\u65e7\u5bf9\u8c61\u5171\u4eab\u540c\u4e00\u4e2a\u5f15\u7528\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6df1\u62f7\u8d1d\u4e5f\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u5bf9\u8c61\uff0c\u4f46\u4f1a\u9012\u5f52\u5730\u590d\u5236\u6240\u6709\u7684\u5f15\u7528\u5bf9\u8c61\uff0c\u786e\u4fdd\u65b0\u5bf9\u8c61\u548c\u539f\u5bf9\u8c61\u5b8c\u5168\u72ec\u7acb\u3002\u65b0\u5bf9\u8c61\u4e0e\u539f\u5bf9\u8c61\u7684\u4efb\u4f55\u66f4\u6539\u90fd\u4e0d\u4f1a\u76f8\u4e92\u5f71\u54cd\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">27.Java \u521b\u5efa\u5bf9\u8c61\u6709\u54ea\u51e0\u79cd\u65b9\u5f0f\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u6709\u56db\u79cd\u521b\u5efa\u5bf9\u8c61\u7684\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2460\u3001new \u5173\u952e\u5b57\u521b\u5efa\uff0c\u8fd9\u662f\u6700\u5e38\u89c1\u548c\u76f4\u63a5\u7684\u65b9\u5f0f\uff0c\u901a\u8fc7\u8c03\u7528\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u6765\u521b\u5efa\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2461\u3001\u53cd\u5c04\u673a\u5236\u521b\u5efa\uff0c\u53cd\u5c04\u673a\u5236\u5141\u8bb8\u5728\u8fd0\u884c\u65f6\u521b\u5efa\u5bf9\u8c61\uff0c\u5e76\u4e14\u53ef\u4ee5\u8bbf\u95ee\u7c7b\u7684\u79c1\u6709\u6210\u5458\uff0c\u5728\u6846\u67b6\u548c\u5de5\u5177\u7c7b\u4e2d\u6bd4\u8f83\u5e38\u89c1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2462\u3001clone \u62f7\u8d1d\u521b\u5efa\uff0c\u901a\u8fc7 clone \u65b9\u6cd5\u521b\u5efa\u5bf9\u8c61\uff0c\u9700\u8981\u5b9e\u73b0 Cloneable \u63a5\u53e3\u5e76\u91cd\u5199 clone \u65b9\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2463\u3001\u5e8f\u5217\u5316\u673a\u5236\u521b\u5efa\uff0c\u901a\u8fc7\u5e8f\u5217\u5316\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5b57\u8282\u6d41\uff0c\u518d\u901a\u8fc7\u53cd\u5e8f\u5217\u5316\u4ece\u5b57\u8282\u6d41\u4e2d\u6062\u590d\u5bf9\u8c61\u3002\u9700\u8981\u5b9e\u73b0 Serializable \u63a5\u53e3\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">28.String \u662f Java \u57fa\u672c\u6570\u636e\u7c7b\u578b\u5417\uff1f\u53ef\u4ee5\u88ab\u7ee7\u627f\u5417\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">String\u4e0d\u662f\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u5176\u4e0d\u53ef\u4ee5\u88ab\u7ee7\u627f<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">29.String \u548c StringBuilder\u3001StringBuffer \u7684\u533a\u522b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">String \u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u5e73\u5e38\u5f00\u53d1\u7528\u5f97\u6700\u591a\uff0c\u5f53\u9047\u5230\u5927\u91cf\u5b57\u7b26\u4e32\u8fde\u63a5\u65f6\uff0c\u5c31\u7528 StringBuilder\uff0c\u5b83\u4e0d\u4f1a\u751f\u6210\u5f88\u591a\u65b0\u7684\u5bf9\u8c61\uff0cStringBuffer \u548c StringBuilder \u7c7b\u4f3c\uff0c\u4f46\u6bcf\u4e2a\u65b9\u6cd5\u4e0a\u90fd\u52a0\u4e86 synchronized \u5173\u952e\u5b57\uff0c\u6240\u4ee5\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"\u8bf7\u8bf4\u8bf4-string-\u7684\u7279\u70b9\">\u8bf7\u8bf4\u8bf4 String \u7684\u7279\u70b9<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>String<\/code>\u7c7b\u7684\u5bf9\u8c61\u662f<a href=\"https:\/\/javabetter.cn\/string\/immutable.html\" target=\"_blank\" rel=\"noreferrer noopener\">\u4e0d\u53ef\u53d8\u7684<\/a>\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u4e00\u65e6\u4e00\u4e2a<code>String<\/code>\u5bf9\u8c61\u88ab\u521b\u5efa\uff0c\u5b83\u6240\u5305\u542b\u7684\u5b57\u7b26\u4e32\u5185\u5bb9\u662f\u4e0d\u53ef\u6539\u53d8\u7684\u3002<\/li>\n\n\n\n<li>\u6bcf\u6b21\u5bf9<code>String<\/code>\u5bf9\u8c61\u8fdb\u884c\u4fee\u6539\u64cd\u4f5c\uff08\u5982\u62fc\u63a5\u3001\u66ff\u6362\u7b49\uff09\u5b9e\u9645\u4e0a\u90fd\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u7684<code>String<\/code>\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u4fee\u6539\u539f\u6709\u5bf9\u8c61\u3002\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u5185\u5b58\u548c\u6027\u80fd\u5f00\u9500\uff0c\u5c24\u5176\u662f\u5728\u5927\u91cf\u5b57\u7b26\u4e32\u64cd\u4f5c\u7684\u60c5\u51b5\u4e0b\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"\u8bf7\u8bf4\u8bf4-stringbuilder-\u7684\u7279\u70b9\">\u8bf7\u8bf4\u8bf4 StringBuilder \u7684\u7279\u70b9<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>StringBuilder<\/code>\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u7684\u65b9\u6cd5\u6765\u8fdb\u884c\u5b57\u7b26\u4e32\u7684\u589e\u5220\u6539\u67e5\u64cd\u4f5c\uff0c\u8fd9\u4e9b\u64cd\u4f5c\u90fd\u662f\u76f4\u63a5\u5728\u539f\u6709\u5b57\u7b26\u4e32\u5bf9\u8c61\u7684\u5e95\u5c42\u6570\u7ec4\u4e0a\u8fdb\u884c\u7684\uff0c\u800c\u4e0d\u662f\u751f\u6210\u65b0\u7684 String \u5bf9\u8c61\u3002<\/li>\n\n\n\n<li><code>StringBuilder<\/code>\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u8fd9\u610f\u5473\u7740\u5728\u6ca1\u6709\u5916\u90e8\u540c\u6b65\u7684\u60c5\u51b5\u4e0b\uff0c\u5b83\u4e0d\u9002\u7528\u4e8e\u591a\u7ebf\u7a0b\u73af\u5883\u3002<\/li>\n\n\n\n<li>\u76f8\u6bd4\u4e8e<code>String<\/code>\uff0c\u5728\u8fdb\u884c\u9891\u7e41\u7684\u5b57\u7b26\u4e32\u4fee\u6539\u64cd\u4f5c\u65f6\uff0c<code>StringBuilder<\/code>\u80fd\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u3002 Java \u4e2d\u7684\u5b57\u7b26\u4e32\u8fde<code>+<\/code>\u64cd\u4f5c\u5176\u5b9e\u5c31\u662f\u901a\u8fc7<code>StringBuilder<\/code>\u5b9e\u73b0\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"\u8bf7\u8bf4\u8bf4-stringbuffer-\u7684\u7279\u70b9\">\u8bf7\u8bf4\u8bf4 StringBuffer \u7684\u7279\u70b9<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><code>StringBuffer<\/code>\u548c<code>StringBuilder<\/code>\u7c7b\u4f3c\uff0c\u4f46<code>StringBuffer<\/code>\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u65b9\u6cd5\u524d\u9762\u90fd\u52a0\u4e86<code>synchronized<\/code>\u5173\u952e\u5b57\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"\u8bf7\u603b\u7ed3\u4e00\u4e0b\u4f7f\u7528\u573a\u666f\">\u603b\u7ed3<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>String<\/strong>\uff1a\u9002\u7528\u4e8e\u5b57\u7b26\u4e32\u5185\u5bb9\u4e0d\u4f1a\u6539\u53d8\u7684\u573a\u666f\uff0c\u6bd4\u5982\u8bf4\u4f5c\u4e3a HashMap \u7684 key\u3002<\/li>\n\n\n\n<li><strong>StringBuilder<\/strong>\uff1a\u9002\u7528\u4e8e\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\u9700\u8981\u9891\u7e41\u4fee\u6539\u5b57\u7b26\u4e32\u5185\u5bb9\u7684\u573a\u666f\uff0c\u6bd4\u5982\u5728\u5faa\u73af\u4e2d\u62fc\u63a5\u6216\u4fee\u6539\u5b57\u7b26\u4e32\uff0c\u662f String \u7684\u5b8c\u7f8e\u66ff\u4ee3\u54c1\u3002<\/li>\n\n\n\n<li><strong>StringBuffer<\/strong>\uff1a\u73b0\u5728\u5df2\u7ecf\u4e0d\u600e\u4e48\u7528\u4e86\uff0c\u56e0\u4e3a\u4e00\u822c\u4e0d\u4f1a\u5728\u591a\u7ebf\u7a0b\u573a\u666f\u4e0b\u53bb\u9891\u7e41\u7684\u4fee\u6539\u5b57\u7b26\u4e32\u5185\u5bb9\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">30.String str1 = new String(&#8220;abc&#8221;) \u548c String str2 = &#8220;abc&#8221; \u7684\u533a\u522b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b64\u5904\u5185\u5bb9\u6d89\u53ca\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u7684\u5185\u5bb9\uff0c\u56e0\u4e3a\u5e38\u91cf\u6c60\u7684\u5b58\u5728\u4f1a\u4f7f\u5f97\u5bf9\u8c61\u521b\u5efa\u4e2a\u6570\u7684\u4e0d\u540c\uff0cnew\u4f1a\u5b9e\u5b9e\u5728\u5728\u7684\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\uff0c\u63a5\u7740\u5c31\u662f\u5b57\u7b26\u4e32\u5e38\u91cf\u662f\u5426\u5728\u5e38\u91cf\u6c60\u4e2d\u5b58\u5728\u7684\u95ee\u9898\uff0c\u8fd9\u4f1a\u5f71\u54cd\u5bf9\u8c61\u521b\u5efa\u7684\u4e2a\u6570<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">31.String \u662f\u4e0d\u53ef\u53d8\u7c7b\u5417\uff1f\u5b57\u7b26\u4e32\u62fc\u63a5\u662f\u5982\u4f55\u5b9e\u73b0\u7684\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">String \u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u8fd9\u610f\u5473\u7740\u4e00\u65e6\u4e00\u4e2a String \u5bf9\u8c61\u88ab\u521b\u5efa\uff0c\u5176\u5b58\u50a8\u7684\u6587\u672c\u5185\u5bb9\u5c31\u4e0d\u80fd\u88ab\u6539\u53d8\u3002\u8fd9\u662f\u56e0\u4e3a\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2460\u3001\u4e0d\u53ef\u53d8\u6027\u4f7f\u5f97 String \u5bf9\u8c61\u5728\u4f7f\u7528\u4e2d\u66f4\u52a0\u5b89\u5168\u3002\u56e0\u4e3a\u5b57\u7b26\u4e32\u7ecf\u5e38\u7528\u4f5c\u53c2\u6570\u4f20\u9012\u7ed9\u5176\u4ed6 Java \u65b9\u6cd5\uff0c\u4f8b\u5982\u7f51\u7edc\u8fde\u63a5\u3001\u6253\u5f00\u6587\u4ef6\u7b49\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c String \u662f\u53ef\u53d8\u7684\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u8c03\u7528\u7684\u53c2\u6570\u503c\u5c31\u53ef\u80fd\u5728\u4e0d\u77e5\u4e0d\u89c9\u4e2d\u88ab\u6539\u53d8\uff0c\u4ece\u800c\u5bfc\u81f4\u7f51\u7edc\u8fde\u63a5\u88ab\u7be1\u6539\u3001\u6587\u4ef6\u88ab\u83ab\u540d\u5176\u5999\u5730\u4fee\u6539\u7b49\u95ee\u9898\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2461\u3001\u4e0d\u53ef\u53d8\u7684\u5bf9\u8c61\u56e0\u4e3a\u72b6\u6001\u4e0d\u4f1a\u6539\u53d8\uff0c\u6240\u4ee5\u66f4\u5bb9\u6613\u8fdb\u884c\u7f13\u5b58\u548c\u91cd\u7528\u3002\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u7684\u51fa\u73b0\u6b63\u662f\u57fa\u4e8e\u8fd9\u4e2a\u539f\u56e0\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u4ee3\u7801\u4e2d\u51fa\u73b0\u76f8\u540c\u7684\u5b57\u7b26\u4e32\u5b57\u9762\u91cf\u65f6\uff0cJVM \u4f1a\u786e\u4fdd\u6240\u6709\u7684\u5f15\u7528\u90fd\u6307\u5411\u5e38\u91cf\u6c60\u4e2d\u7684\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4ece\u800c\u8282\u7ea6\u5185\u5b58\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2462\u3001\u56e0\u4e3a String \u7684\u5185\u5bb9\u4e0d\u4f1a\u6539\u53d8\uff0c\u6240\u4ee5\u5b83\u7684\u54c8\u5e0c\u503c\u4e5f\u5c31\u56fa\u5b9a\u4e0d\u53d8\u3002\u8fd9\u4f7f\u5f97 String \u5bf9\u8c61\u7279\u522b\u9002\u5408\u4f5c\u4e3a HashMap \u6216 HashSet \u7b49\u96c6\u5408\u7684\u952e\uff0c\u56e0\u4e3a\u8ba1\u7b97\u54c8\u5e0c\u503c\u53ea\u9700\u8981\u8fdb\u884c\u4e00\u6b21\uff0c\u63d0\u9ad8\u4e86\u54c8\u5e0c\u8868\u64cd\u4f5c\u7684\u6548\u7387\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u5b57\u7b26\u4e32\u7684\u62fc\u63a5\u5efa\u8bae\u4f7f\u7528StringBuilder\uff0c\u8fd9\u6837\u4e0d\u4f1a\u9891\u7e41\u7684\u4ea7\u751f\u65b0\u7684\u5bf9\u8c61\u5360\u7528\u5185\u5b58\u7a7a\u95f4\u9020\u6210OOM\u95ee\u9898\uff0c\u9891\u7e41\u4f7f\u7528+\u62fc\u63a5\u5b57\u7b26\u4e32\u4f1a\u4ea7\u751f\u65b0\u7684\u5bf9\u8c61<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">32.intern \u65b9\u6cd5\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u5f53\u524d\u5b57\u7b26\u4e32\u5185\u5bb9\u5b58\u5728\u4e8e\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\uff08\u5373 equals()\u65b9\u6cd5\u4e3a true\uff0c\u4e5f\u5c31\u662f\u5185\u5bb9\u4e00\u6837\uff09\uff0c\u76f4\u63a5\u8fd4\u56de\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u7684\u5b57\u7b26\u4e32<\/li>\n\n\n\n<li>\u5426\u5219\uff0c\u5c06\u6b64 String \u5bf9\u8c61\u6dfb\u52a0\u5230\u6c60\u4e2d\uff0c\u5e76\u8fd4\u56de String \u5bf9\u8c61\u7684\u5f15\u7528<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">33.String \u600e\u4e48\u8f6c\u6210 Integer \u7684\uff1f\u539f\u7406\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">String \u8f6c\u6210 Integer\uff0c\u4e3b\u8981\u6709\u4e24\u4e2a\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Integer.parseInt(String s)<\/li>\n\n\n\n<li>Integer.valueOf(String s)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u7ba1\u54ea\u4e00\u79cd\uff0c\u6700\u7ec8\u8fd8\u662f\u4f1a\u8c03\u7528 Integer \u7c7b\u5185\u4e2d\u7684<code>parseInt(String s, int radix)<\/code>\u65b9\u6cd5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">34.Java \u4e2d\u5f02\u5e38\u5904\u7406\u4f53\u7cfb?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Throwable<\/code>&nbsp;\u662f Java \u8bed\u8a00\u4e2d\u6240\u6709\u9519\u8bef\u548c\u5f02\u5e38\u7684\u57fa\u7c7b\u3002\u5b83\u6709\u4e24\u4e2a\u4e3b\u8981\u7684\u5b50\u7c7b\uff1aError \u548c Exception\uff0c\u8fd9\u4e24\u4e2a\u7c7b\u5206\u522b\u4ee3\u8868\u4e86 Java \u5f02\u5e38\u5904\u7406\u4f53\u7cfb\u4e2d\u7684\u4e24\u4e2a\u5206\u652f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Error \u7c7b\u4ee3\u8868\u90a3\u4e9b\u4e25\u91cd\u7684\u9519\u8bef\uff0c\u8fd9\u7c7b\u9519\u8bef\u901a\u5e38\u662f\u7a0b\u5e8f\u65e0\u6cd5\u5904\u7406\u7684\u3002\u6bd4\u5982\uff0cOutOfMemoryError \u8868\u793a\u5185\u5b58\u4e0d\u8db3\uff0cStackOverflowError \u8868\u793a\u6808\u6ea2\u51fa\u3002\u8fd9\u4e9b\u9519\u8bef\u901a\u5e38\u4e0e JVM \u7684\u8fd0\u884c\u72b6\u6001\u6709\u5173\uff0c\u4e00\u65e6\u53d1\u751f\uff0c\u5e94\u7528\u7a0b\u5e8f\u901a\u5e38\u65e0\u6cd5\u6062\u590d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Exception \u7c7b\u4ee3\u8868\u7a0b\u5e8f\u53ef\u4ee5\u5904\u7406\u7684\u5f02\u5e38\u3002\u5b83\u5206\u4e3a\u4e24\u5927\u7c7b\uff1a\u7f16\u8bd1\u65f6\u5f02\u5e38\uff08Checked Exception\uff09\u548c\u8fd0\u884c\u65f6\u5f02\u5e38\uff08Runtime Exception\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2460\u3001\u7f16\u8bd1\u65f6\u5f02\u5e38\uff08Checked Exception\uff09\uff1a\u8fd9\u7c7b\u5f02\u5e38\u5728\u7f16\u8bd1\u65f6\u5fc5\u987b\u88ab\u663e\u5f0f\u5904\u7406\uff08\u6355\u83b7\u6216\u58f0\u660e\u629b\u51fa\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u65b9\u6cd5\u53ef\u80fd\u629b\u51fa\u67d0\u79cd\u7f16\u8bd1\u65f6\u5f02\u5e38\uff0c\u4f46\u6ca1\u6709\u6355\u83b7\u5b83\uff08try-catch\uff09\u6216\u6ca1\u6709\u5728\u65b9\u6cd5\u58f0\u660e\u4e2d\u7528 throws \u5b50\u53e5\u58f0\u660e\u5b83\uff0c\u90a3\u4e48\u7f16\u8bd1\u5c06\u4e0d\u4f1a\u901a\u8fc7\u3002\u4f8b\u5982\uff1aIOException\u3001SQLException \u7b49\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2461\u3001\u8fd0\u884c\u65f6\u5f02\u5e38\uff08Runtime Exception\uff09\uff1a\u8fd9\u7c7b\u5f02\u5e38\u5728\u8fd0\u884c\u65f6\u629b\u51fa\uff0c\u5b83\u4eec\u90fd\u662f RuntimeException \u7684\u5b50\u7c7b\u3002\u5bf9\u4e8e\u8fd0\u884c\u65f6\u5f02\u5e38\uff0cJava \u7f16\u8bd1\u5668\u4e0d\u8981\u6c42\u5fc5\u987b\u5904\u7406\u5b83\u4eec\uff08\u5373\u4e0d\u9700\u8981\u6355\u83b7\u4e5f\u4e0d\u9700\u8981\u58f0\u660e\u629b\u51fa\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\u65f6\u5f02\u5e38\u901a\u5e38\u662f\u7531\u7a0b\u5e8f\u903b\u8f91\u9519\u8bef\u5bfc\u81f4\u7684\uff0c\u5982 NullPointerException\u3001IndexOutOfBoundsException \u7b49\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">35.\u5f02\u5e38\u7684\u5904\u7406\u65b9\u5f0f\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9047\u5230\u5f02\u5e38\u65f6\u53ef\u4ee5\u4e0d\u5904\u7406\uff0c\u76f4\u63a5\u901a\u8fc7throw \u548c throws \u629b\u51fa\u5f02\u5e38\uff0c\u4ea4\u7ed9\u4e0a\u5c42\u8c03\u7528\u8005\u5904\u7406\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">throws \u5173\u952e\u5b57\u7528\u4e8e\u58f0\u660e\u53ef\u80fd\u4f1a\u629b\u51fa\u7684\u5f02\u5e38\uff0c\u800c throw \u5173\u952e\u5b57\u7528\u4e8e\u629b\u51fa\u5f02\u5e38<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528 try-catch \u6355\u83b7\u5f02\u5e38\uff0c\u5904\u7406\u5f02\u5e38\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">36.Java \u4e2d IO \u6d41\u5206\u4e3a\u51e0\u79cd?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u90e8\u5206\u5c31\u591a\u4e86\uff0c\u5927\u4f53\u4e0a\u5206\u662f\u6587\u4ef6\u6d41FIle\uff0c\u5b57\u8282\u6d41InPutStream\uff0cOutPutStream\uff0c\u5b57\u7b26\u6d41Reader\uff0cWriter\uff0c\u7f13\u51b2\u6d41BufferInputStream\uff0cBufferOutPutStream\uff0c\u8f6c\u6362\u6d41ObjectInPutStream,ObjectOutPutStream\uff0c\u5e8f\u5217\u5316\u6d41<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"java-\u7f13\u51b2\u533a\u6ea2\u51fa-\u5982\u4f55\u9884\u9632\">Java \u7f13\u51b2\u533a\u6ea2\u51fa\uff0c\u5982\u4f55\u9884\u9632<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u7f13\u51b2\u533a\u6ea2\u51fa\u4e3b\u8981\u662f\u7531\u4e8e\u5411\u7f13\u51b2\u533a\u5199\u5165\u7684\u6570\u636e\u8d85\u8fc7\u5176\u80fd\u591f\u5b58\u50a8\u7684\u6570\u636e\u91cf\u3002\u53ef\u4ee5\u91c7\u7528\u8fd9\u4e9b\u63aa\u65bd\u6765\u907f\u514d\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2460\u3001<strong>\u5408\u7406\u8bbe\u7f6e\u7f13\u51b2\u533a\u5927\u5c0f<\/strong>\uff1a\u5728\u521b\u5efa\u7f13\u51b2\u533a\u65f6\uff0c\u5e94\u6839\u636e\u5b9e\u9645\u9700\u6c42\u5408\u7406\u8bbe\u7f6e\u7f13\u51b2\u533a\u7684\u5927\u5c0f\uff0c\u907f\u514d\u521b\u5efa\u8fc7\u5927\u6216\u8fc7\u5c0f\u7684\u7f13\u51b2\u533a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2461\u3001<strong>\u63a7\u5236\u5199\u5165\u6570\u636e\u91cf<\/strong>\uff1a\u5728\u5411\u7f13\u51b2\u533a\u5199\u5165\u6570\u636e\u65f6\uff0c\u5e94\u8be5\u63a7\u5236\u5199\u5165\u7684\u6570\u636e\u91cf\uff0c\u786e\u4fdd\u4e0d\u4f1a\u8d85\u8fc7\u7f13\u51b2\u533a\u7684\u5bb9\u91cf\u3002Java \u7684 ByteBuffer \u7c7b\u63d0\u4f9b\u4e86<code>remaining()<\/code>\u65b9\u6cd5\uff0c\u53ef\u4ee5\u83b7\u53d6\u7f13\u51b2\u533a\u4e2d\u5269\u4f59\u7684\u53ef\u5199\u5165\u6570\u636e\u91cf\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">37.\u65e2\u7136\u6709\u4e86\u5b57\u8282\u6d41,\u4e3a\u4ec0\u4e48\u8fd8\u8981\u6709\u5b57\u7b26\u6d41?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u5b9e\u5b57\u7b26\u6d41\u662f\u7531 Java \u865a\u62df\u673a\u5c06\u5b57\u8282\u8f6c\u6362\u5f97\u5230\u7684\uff0c\u95ee\u9898\u5c31\u51fa\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u8fd8\u6bd4\u8f83\u8017\u65f6\uff0c\u5e76\u4e14\uff0c\u5982\u679c\u6211\u4eec\u4e0d\u77e5\u9053\u7f16\u7801\u7c7b\u578b\u5c31\u5f88\u5bb9\u6613\u51fa\u73b0\u4e71\u7801\u95ee\u9898\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\uff0c I\/O \u6d41\u5c31\u5e72\u8106\u63d0\u4f9b\u4e86\u4e00\u4e2a\u76f4\u63a5\u64cd\u4f5c\u5b57\u7b26\u7684\u63a5\u53e3\uff0c\u65b9\u4fbf\u6211\u4eec\u5e73\u65f6\u5bf9\u5b57\u7b26\u8fdb\u884c\u6d41\u64cd\u4f5c\u3002\u5982\u679c\u97f3\u9891\u6587\u4ef6\u3001\u56fe\u7247\u7b49\u5a92\u4f53\u6587\u4ef6\u7528\u5b57\u8282\u6d41\u6bd4\u8f83\u597d\uff0c\u5982\u679c\u6d89\u53ca\u5230\u5b57\u7b26\u7684\u8bdd\u4f7f\u7528\u5b57\u7b26\u6d41\u6bd4\u8f83\u597d\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"\u6587\u672c\u5b58\u50a8\u662f\u5b57\u8282\u6d41\u8fd8\u662f\u5b57\u7b26\u6d41-\u89c6\u9891\u6587\u4ef6\u5462\">\u6587\u672c\u5b58\u50a8\u662f\u5b57\u8282\u6d41\u8fd8\u662f\u5b57\u7b26\u6d41\uff0c\u89c6\u9891\u6587\u4ef6\u5462\uff1f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8ba1\u7b97\u673a\u4e2d\uff0c\u6587\u672c\u548c\u89c6\u9891\u90fd\u662f\u6309\u7167\u5b57\u8282\u5b58\u50a8\u7684\uff0c\u53ea\u662f\u5982\u679c\u662f\u6587\u672c\u6587\u4ef6\u7684\u8bdd\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5b57\u7b26\u6d41\u7684\u5f62\u5f0f\u53bb\u8bfb\u53d6\uff0c\u8fd9\u6837\u66f4\u65b9\u9762\u7684\u6211\u4eec\u8fdb\u884c\u76f4\u63a5\u5904\u7406\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6bd4\u5982\u8bf4\u6211\u4eec\u9700\u8981\u5728\u4e00\u4e2a\u5927\u6587\u672c\u6587\u4ef6\u4e2d\u67e5\u627e\u67d0\u4e2a\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u5b57\u7b26\u6d41\u6765\u8bfb\u53d6\u5224\u65ad\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5904\u7406\u89c6\u9891\u6587\u4ef6\u65f6\uff0c\u901a\u5e38\u4f7f\u7528\u5b57\u8282\u6d41\uff08\u5982 Java \u4e2d\u7684<code>FileInputStream<\/code>\u3001<code>FileOutputStream<\/code>\uff09\u6765\u8bfb\u53d6\u6216\u5199\u5165\u6570\u636e\uff0c\u5e76\u4e14\u4f1a\u5c3d\u91cf\u4f7f\u7528\u7f13\u51b2\u6d41\uff08\u5982<code>BufferedInputStream<\/code>\u3001<code>BufferedOutputStream<\/code>\uff09\u6765\u63d0\u9ad8\u8bfb\u5199\u6548\u7387\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u6280\u672f\u6d3e\u5b9e\u6218\u9879\u76ee\u9879\u76ee\u4e2d\uff0c\u5bf9\u4e8e\u6587\u672c\uff0c\u6bd4\u5982\u8bf4\u6587\u7ae0\u548c\u6559\u7a0b\u5185\u5bb9\uff0c\u662f\u76f4\u63a5\u5b58\u50a8\u5728\u6570\u636e\u5e93\u4e2d\u7684\uff0c\u800c\u5bf9\u4e8e\u89c6\u9891\u548c\u56fe\u7247\u7b49\u5927\u6587\u4ef6\uff0c\u662f\u5b58\u50a8\u5728 OSS \u4e2d\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\uff0c\u65e0\u8bba\u662f\u6587\u672c\u6587\u4ef6\u8fd8\u662f\u89c6\u9891\u6587\u4ef6\uff0c\u5b83\u4eec\u5728\u7269\u7406\u5b58\u50a8\u5c42\u9762\u90fd\u662f\u4ee5\u5b57\u8282\u6d41\u7684\u5f62\u5f0f\u5b58\u5728\u3002\u533a\u522b\u5728\u4e8e\uff0c\u6211\u4eec\u5982\u4f55\u901a\u8fc7 Java \u4ee3\u7801\u6765\u89e3\u91ca\u548c\u5904\u7406\u8fd9\u4e9b\u5b57\u8282\u6d41\uff1a\u4f5c\u4e3a\u7f16\u7801\u540e\u7684\u5b57\u7b26\u8fd8\u662f\u4f5c\u4e3a\u4e8c\u8fdb\u5236\u6570\u636e\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">38.BIO\u3001NIO\u3001AIO \u4e4b\u95f4\u7684\u533a\u522b\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">BIO\uff1a\u91c7\u7528\u963b\u585e\u5f0f I\/O \u6a21\u578b\uff0c\u7ebf\u7a0b\u5728\u6267\u884c I\/O \u64cd\u4f5c\u65f6\u88ab\u963b\u585e\uff0c\u65e0\u6cd5\u5904\u7406\u5176\u4ed6\u4efb\u52a1\uff0c\u9002\u7528\u4e8e\u8fde\u63a5\u6570\u8f83\u5c11\u7684\u573a\u666f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">NIO\uff1a\u91c7\u7528\u975e\u963b\u585e I\/O \u6a21\u578b\uff0c\u7ebf\u7a0b\u5728\u7b49\u5f85 I\/O \u65f6\u53ef\u6267\u884c\u5176\u4ed6\u4efb\u52a1\uff0c\u901a\u8fc7 Selector \u76d1\u63a7\u591a\u4e2a Channel \u4e0a\u7684\u4e8b\u4ef6\uff0c\u9002\u7528\u4e8e\u8fde\u63a5\u6570\u591a\u4f46\u8fde\u63a5\u65f6\u95f4\u77ed\u7684\u573a\u666f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AIO\uff1a\u4f7f\u7528\u5f02\u6b65 I\/O \u6a21\u578b\uff0c\u7ebf\u7a0b\u53d1\u8d77 I\/O \u8bf7\u6c42\u540e\u7acb\u5373\u8fd4\u56de\uff0c\u5f53 I\/O \u64cd\u4f5c\u5b8c\u6210\u65f6\u901a\u8fc7\u56de\u8c03\u51fd\u6570\u901a\u77e5\u7ebf\u7a0b\uff0c\u9002\u7528\u4e8e\u8fde\u63a5\u6570\u591a\u4e14\u8fde\u63a5\u65f6\u95f4\u957f\u7684\u573a\u666f\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"\u7b80\u5355\u8bf4\u4e00\u4e0b-bio\">\u7b80\u5355\u8bf4\u4e00\u4e0b BIO\uff1f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">BIO\uff0c\u4e5f\u5c31\u662f\u4f20\u7edf\u7684 IO\uff0c\u57fa\u4e8e\u5b57\u8282\u6d41\u6216\u5b57\u7b26\u6d41\uff08\u5982 FileInputStream\u3001BufferedReader \u7b49\uff09\u8fdb\u884c\u6587\u4ef6\u8bfb\u5199\uff0c\u57fa\u4e8e Socket \u548c ServerSocket \u8fdb\u884c\u7f51\u7edc\u901a\u4fe1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u6bcf\u4e2a\u8fde\u63a5\uff0c\u90fd\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u72ec\u7acb\u7684\u7ebf\u7a0b\u6765\u5904\u7406\u8bfb\u5199\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b80\u5355\u8bf4\u4e0b NIO\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">NIO \u7684\u9b45\u529b\u4e3b\u8981\u4f53\u73b0\u5728\u7f51\u7edc\u7f16\u7a0b\u4e2d\uff0c\u670d\u52a1\u5668\u53ef\u4ee5\u7528\u4e00\u4e2a\u7ebf\u7a0b\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\uff0c\u901a\u8fc7 Selector \u76d1\u542c\u591a\u4e2a Channel \u6765\u5b9e\u73b0\u591a\u8def\u590d\u7528\uff0c\u6781\u5927\u5730\u63d0\u9ad8\u4e86\u7f51\u7edc\u7f16\u7a0b\u7684\u6027\u80fd\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b80\u5355\u8bf4\u4e0b AIO\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b83\u5f15\u5165\u4e86\u5f02\u6b65\u901a\u9053\u7684\u6982\u5ff5\uff0c\u4f7f\u5f97 I\/O \u64cd\u4f5c\u53ef\u4ee5\u5f02\u6b65\u8fdb\u884c\u3002\u8fd9\u610f\u5473\u7740\u7ebf\u7a0b\u53d1\u8d77\u4e00\u4e2a\u8bfb\u5199\u64cd\u4f5c\u540e\u4e0d\u5fc5\u7b49\u5f85\u5176\u5b8c\u6210\uff0c\u53ef\u4ee5\u7acb\u5373\u8fdb\u884c\u5176\u4ed6\u4efb\u52a1\uff0c\u5e76\u4e14\u5f53\u8bfb\u5199\u64cd\u4f5c\u771f\u6b63\u5b8c\u6210\u65f6\uff0c\u7ebf\u7a0b\u4f1a\u88ab\u5f02\u6b65\u5730\u901a\u77e5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">39.\u4ec0\u4e48\u662f\u5e8f\u5217\u5316\uff1f\u4ec0\u4e48\u662f\u53cd\u5e8f\u5217\u5316\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e8f\u5217\u5316\uff08Serialization\uff09\u662f\u6307\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5b57\u8282\u6d41\u7684\u8fc7\u7a0b\uff0c\u4ee5\u4fbf\u80fd\u591f\u5c06\u8be5\u5bf9\u8c61\u4fdd\u5b58\u5230\u6587\u4ef6\u3001\u6570\u636e\u5e93\uff0c\u6216\u8005\u8fdb\u884c\u7f51\u7edc\u4f20\u8f93\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53cd\u5e8f\u5217\u5316\uff08Deserialization\uff09\u5c31\u662f\u5c06\u5b57\u8282\u6d41\u8f6c\u6362\u56de\u5bf9\u8c61\u7684\u8fc7\u7a0b\uff0c\u4ee5\u4fbf\u6784\u5efa\u539f\u59cb\u5bf9\u8c61\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"serializable-\u63a5\u53e3\u6709\u4ec0\u4e48\u7528\">Serializable \u63a5\u53e3\u6709\u4ec0\u4e48\u7528\uff1f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Serializable<\/code>\u63a5\u53e3\u7528\u4e8e\u6807\u8bb0\u4e00\u4e2a\u7c7b\u53ef\u4ee5\u88ab\u5e8f\u5217\u5316<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"serialversionuid-\u6709\u4ec0\u4e48\u7528\">serialVersionUID \u6709\u4ec0\u4e48\u7528\uff1f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">serialVersionUID \u662f Java \u5e8f\u5217\u5316\u673a\u5236\u4e2d\u7528\u4e8e\u6807\u8bc6\u7c7b\u7248\u672c\u7684\u552f\u4e00\u6807\u8bc6\u7b26\u3002\u5b83\u7684\u4f5c\u7528\u662f\u786e\u4fdd\u5728\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u8fc7\u7a0b\u4e2d\uff0c\u7c7b\u7684\u7248\u672c\u662f\u517c\u5bb9\u7684<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"java-\u5e8f\u5217\u5316\u4e0d\u5305\u542b\u9759\u6001\u53d8\u91cf\u5417\">Java \u5e8f\u5217\u5316\u4e0d\u5305\u542b\u9759\u6001\u53d8\u91cf\u5417\uff1f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u662f\u7684\uff0c\u5e8f\u5217\u5316\u673a\u5236\u53ea\u4f1a\u4fdd\u5b58\u5bf9\u8c61\u7684\u72b6\u6001\uff0c\u800c\u9759\u6001\u53d8\u91cf\u5c5e\u4e8e\u7c7b\u7684\u72b6\u6001\uff0c\u4e0d\u5c5e\u4e8e\u5bf9\u8c61\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"\u5982\u679c\u6709\u4e9b\u53d8\u91cf\u4e0d\u60f3\u5e8f\u5217\u5316-\u600e\u4e48\u529e\">\u5982\u679c\u6709\u4e9b\u53d8\u91cf\u4e0d\u60f3\u5e8f\u5217\u5316\uff0c\u600e\u4e48\u529e\uff1f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u4f7f\u7528<code>transient<\/code>\u5173\u952e\u5b57\u4fee\u9970\u4e0d\u60f3\u5e8f\u5217\u5316\u7684\u53d8\u91cf<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">40.Java \u6cdb\u578b\u4e86\u89e3\u4e48\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6cdb\u578b\u4e3b\u8981\u7528\u4e8e\u63d0\u9ad8\u4ee3\u7801\u7684\u7c7b\u578b\u5b89\u5168\uff0c\u5b83\u5141\u8bb8\u5728\u5b9a\u4e49\u7c7b\u3001\u63a5\u53e3\u548c\u65b9\u6cd5\u65f6\u4f7f\u7528\u7c7b\u578b\u53c2\u6570\uff0c\u8fd9\u6837\u53ef\u4ee5\u5728\u7f16\u8bd1\u65f6\u68c0\u67e5\u7c7b\u578b\u4e00\u81f4\u6027\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u7c7b\u578b\u8f6c\u6362\u548c\u7c7b\u578b\u9519\u8bef\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ca1\u6709\u6cdb\u578b\u7684\u65f6\u5019\uff0c\u50cf List \u8fd9\u6837\u7684\u96c6\u5408\u7c7b\u5b58\u50a8\u7684\u662f Object \u7c7b\u578b\uff0c\u5bfc\u81f4\u4ece\u96c6\u5408\u4e2d\u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u5fc5\u987b\u8fdb\u884c\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff0c\u5426\u5219\u4f1a\u5f15\u53d1 ClassCastException\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"\u6cdb\u578b\u5e38\u7528\u7684\u901a\u914d\u7b26\u6709\u54ea\u4e9b\">\u6cdb\u578b\u5e38\u7528\u7684\u901a\u914d\u7b26\u6709\u54ea\u4e9b\uff1f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5e38\u7528\u7684\u901a\u914d\u7b26\u4e3a\uff1a T\uff0cE\uff0cK\uff0cV\uff0c\uff1f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\uff1f \u8868\u793a\u4e0d\u786e\u5b9a\u7684 java \u7c7b\u578b<\/li>\n\n\n\n<li>T (type) \u8868\u793a\u5177\u4f53\u7684\u4e00\u4e2a java \u7c7b\u578b<\/li>\n\n\n\n<li>K V (key value) \u5206\u522b\u4ee3\u8868 java \u952e\u503c\u4e2d\u7684 Key Value<\/li>\n\n\n\n<li>E (element) \u4ee3\u8868 Element<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">41.\u4ec0\u4e48\u662f\u53cd\u5c04\uff1f\u5e94\u7528\uff1f\u539f\u7406\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u53cd\u5c04\u5141\u8bb8 Java \u5728\u8fd0\u884c\u65f6\u68c0\u67e5\u548c\u64cd\u4f5c\u7c7b\u7684\u65b9\u6cd5\u548c\u5b57\u6bb5\u3002\u901a\u8fc7\u53cd\u5c04\uff0c\u53ef\u4ee5\u52a8\u6001\u5730\u83b7\u53d6\u7c7b\u7684\u5b57\u6bb5\u3001\u65b9\u6cd5\u3001\u6784\u9020\u65b9\u6cd5\u7b49\u4fe1\u606f\uff0c\u5e76\u5728\u8fd0\u884c\u65f6\u8c03\u7528\u65b9\u6cd5\u6216\u8bbf\u95ee\u5b57\u6bb5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53cd\u5c04\u6709\u54ea\u4e9b\u5e94\u7528\u573a\u666f\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2460\u3001Spring \u6846\u67b6\u5c31\u5927\u91cf\u4f7f\u7528\u4e86\u53cd\u5c04\u6765\u52a8\u6001\u52a0\u8f7d\u548c\u7ba1\u7406 Bean\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2461\u3001Java \u7684\u52a8\u6001\u4ee3\u7406\uff08Dynamic Proxy\uff09\u673a\u5236\u5c31\u4f7f\u7528\u4e86\u53cd\u5c04\u6765\u521b\u5efa\u4ee3\u7406\u7c7b\u3002\u4ee3\u7406\u7c7b\u53ef\u4ee5\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u5904\u7406\u65b9\u6cd5\u8c03\u7528\uff0c\u8fd9\u5728\u5b9e\u73b0 AOP \u548c\u62e6\u622a\u5668\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2462\u3001JUnit \u548c TestNG \u7b49\u6d4b\u8bd5\u6846\u67b6\u4f7f\u7528\u53cd\u5c04\u673a\u5236\u6765\u53d1\u73b0\u548c\u6267\u884c\u6d4b\u8bd5\u65b9\u6cd5\u3002\u53cd\u5c04\u5141\u8bb8\u6846\u67b6\u626b\u63cf\u7c7b\uff0c\u67e5\u627e\u5e26\u6709\u7279\u5b9a\u6ce8\u89e3\uff08\u5982\u00a0<code>@Test<\/code>\uff09\u7684\u65b9\u6cd5\uff0c\u5e76\u5728\u8fd0\u884c\u65f6\u8c03\u7528\u5b83\u4eec\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"\u53cd\u5c04\u7684\u539f\u7406\u662f\u4ec0\u4e48\">\u53cd\u5c04\u7684\u539f\u7406\u662f\u4ec0\u4e48\uff1f<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u7a0b\u5e8f\u7684\u6267\u884c\u5206\u4e3a\u7f16\u8bd1\u548c\u8fd0\u884c\u4e24\u6b65\uff0c\u7f16\u8bd1\u4e4b\u540e\u4f1a\u751f\u6210\u5b57\u8282\u7801(.class)\u6587\u4ef6\uff0cJVM \u8fdb\u884c\u7c7b\u52a0\u8f7d\u7684\u65f6\u5019\uff0c\u4f1a\u52a0\u8f7d\u5b57\u8282\u7801\u6587\u4ef6\uff0c\u5c06\u7c7b\u578b\u76f8\u5173\u7684\u6240\u6709\u4fe1\u606f\u52a0\u8f7d\u8fdb\u65b9\u6cd5\u533a\uff0c\u53cd\u5c04\u5c31\u662f\u53bb\u83b7\u53d6\u8fd9\u4e9b\u4fe1\u606f\uff0c\u7136\u540e\u8fdb\u884c\u5404\u79cd\u64cd\u4f5c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>. 1.Java\u8bed\u8a00\u6709\u4ec0\u4e48\u7279\u70b9 2.JVM,JRE,JDK\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b 3.\u8bf4\u8bf4\u4ec0\u4e48\u662f\u8de8\u5e73\u53f0\uff1f\u539f\u7406\u662f\u4ec0\u4e48 \u6240 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":163,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,1,8],"tags":[],"class_list":["post-160","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","category-learn","category-8"],"_links":{"self":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts\/160","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=160"}],"version-history":[{"count":2,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts\/160\/revisions"}],"predecessor-version":[{"id":162,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts\/160\/revisions\/162"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/media\/163"}],"wp:attachment":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}