{"id":31037,"date":"2023-10-21T19:46:24","date_gmt":"2023-01-15T10:40:08","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava-3\/"},"modified":"2025-08-12T21:59:53","modified_gmt":"2025-08-12T13:59:53","slug":"%e5%85%b3%e4%ba%8ejava-3","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava-3\/","title":{"rendered":"\u5173\u4e8eJava"},"content":{"rendered":"<h2>\u5728\u8c08\u8bbaJava\u4e4b\u524d\u4f7f\u7528Java\u505a\u4ec0\u4e48\uff1f<\/p>\n<p>\u4f7f\u7528Java\uff0c\u5728\u4e09\u5c42\u7ed3\u6784\u4e2d\uff0c\u5f53\u9700\u8981\u8fdb\u884c\u52a8\u6001\u5904\u7406\u65f6\uff0c\u5411\u5e94\u7528\u670d\u52a1\u5668\u53d1\u9001\u8bf7\u6c42\uff0c\u5e76\u5c06\u63a5\u6536\u5230\u7684\u7ed3\u679c\u8fd4\u56de\u7ed9Web\u6d4f\u89c8\u5668\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6211\u4eec\u9700\u8981\u7684\u662f\u7aef\u53e3\u53f7\u3002\u7aef\u53e3\u53f7\u662f\u7528\u4e8e\u8bc6\u522b\u670d\u52a1\u5668\u63d0\u4f9b\u7684\u670d\u52a1\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4ee3\u8868\u6027\u7684\u7aef\u53e3\u53f7\u3002<\/p>\n<p>\u8fd9\u4e2a\u53e5\u5b50\u662f\u4ece\u300a\u6613\u61c2\u7684Java \u7b2c5\u7248\uff08\u201c\u6613\u61c2\u201d\u7cfb\u5217\uff09\uff1a\u9ad8\u6865\u9ebb\u5948\u300b\u4e2d\u5f15\u7528\u7684\u3002<\/p>\n<h3>\u5e94\u8be5\u8bb0\u4f4f\u7684Java\u4f7f\u7528\u5907\u5fd8\u5f55<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b3\u30e1\u30f3\u30c8\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u308b\u3068\u53d6\u308a\u9664\u304b\u308c\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">ava\u3067\u306fobject\u30af\u30e9\u30b9\u3092\u7b46\u982d\u306b\u69d8\u3005\u306a\u30af\u30e9\u30b9\u3092\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u3053\u308c\u3089\u3082\u3059\u3079\u3066\u30d1\u30c3\u30b1\u30fc\u30b8\u3067\u7ba1\u7406\u3055\u308c\u3066\u3044\u307e\u3059\u3002import \u306e\u6642\u306b *(\u30a2\u30b9\u30bf\u30ea\u30b9\u30af)\u3067import\u3057\u3066\u3084\u308b\u3068\u3001\u305d\u306e\u30d1\u30c3\u30b1\u30fc\u30b8\u5185\u306e\u30af\u30e9\u30b9\u3092\u3059\u3079\u3066\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/ul>\n<h2>\u7b2c\u516b\u8bfe\u7684\u57fa\u672c\u5185\u5bb9<\/p>\n<h4>\u8c03\u7528\u65b9\u6cd5<\/p>\n<pre class=\"post-pre\"><code>\/\/\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u3055\u3059\u5909\u6570\u540d.\u30e1\u30bd\u30c3\u30c9\u540d\uff08\u5f15\u6570\u30ea\u30b9\u30c8\uff09;\r\n<\/code><\/pre>\n<h2>\u7b2c9\u8ab2\uff0c\u8ab2\u5802\u7684\u529f\u80fd<\/p>\n<h3>9.1 \u5bf9\u6210\u5458\u7684\u8bbf\u95ee\u9650\u5236\u5c06private\u6210\u5458\u4f5c\u4e3a\u65e0\u6cd5\u4ece\u7c7b\u5916\u90e8\u81ea\u7531\u8bbf\u95ee\u7684\u6210\u5458\u8fdb\u884c\u4fdd\u5b58\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">Class<\/span> <span class=\"nc\">Car<\/span>\r\n<span class=\"o\">{<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kt\">int<\/span> <span class=\"n\">num<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kt\">double<\/span> <span class=\"n\">gas<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">Sample1<\/span>\r\n<span class=\"o\">{<\/span>\r\n     <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n     <span class=\"c1\">\/\/\u3053\u306e\u3088\u3046\u306a\u30a2\u30af\u30bb\u30b9\u306f\u3067\u304d\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/span>\r\n     <span class=\"c1\">\/\/car1.num = 1234;<\/span>\r\n     <span class=\"c1\">\/\/car1.gas = -10.0;<\/span>\r\n     <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u4e86\u89e3\u5982\u4f55\u5b9e\u73b0\u5c01\u88c5\u673a\u5236\u8981\u83b7\u53d6\u79c1\u6709\u53d8\u91cf\u7684\u503c\uff0c\u5728\u540c\u4e00\u4e2a\u7c7b\u5185\u90e8\u4f7f\u7528\u201cget\u201d\u6765\u83b7\u53d6\uff08\u4ee5\u5927\u5199\u5b57\u6bcd\u5f00\u5934\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">getHogehoge<\/span><span class=\"o\">(){<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">name<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8bbe\u5b9a\u6784\u9020\u51fd\u6570\u3001\u83b7\u53d6\u5668\u548c\u8bbe\u7f6e\u5668<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Nurse<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"nf\">Nurse<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"c1\">\/\/new\u3092\u3057\u305f\u3089\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u5f15\u6570\u3092\u6307\u5b9a\u3002<\/span>\r\n        <span class=\"c1\">\/\/\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306f\u3001\u623b\u308a\u5024\u3092\u6307\u5b9a\u3067\u304d\u306a\u3044\u3002<\/span>\r\n        <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">name<\/span> <span class=\"o\">=<\/span> <span class=\"n\">name<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getName<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"c1\">\/\/\u5f15\u6570\u304c\u304c\u5165\u3063\u3066\u3001\u5024\u3092\u53d6\u5f97\u3002\u5ba3\u8a00\u3055\u308c\u305f\u6587\u5b57\u5217\u578b\u306ename\u3002<\/span>\r\n        <span class=\"c1\">\/\/getter\u306f\u5024\u3092\u53d6\u5f97\u3059\u308b\u3060\u3051\u3067\u3001\u66f8\u304d\u63db\u3048\u3089\u308c\u306a\u3044\u306e\u3067\u3001\u4e0b\u306esetName\u30bb\u30c3\u30bf\u30fc\u3067\u66f8\u304d\u63db\u3048\u308b\u3002<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">name<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"c1\">\/\/\u9806\u756a\u306f\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u5f15\u304c\u3042\u308b\u3082\u306e\u3092\u30bb\u30c3\u30bf\u30fc\u3067\u5024\u3092\u5909\u66f4\u3057\u3001\u30b2\u30c3\u30bf\u30fc\u3067\u5024\u3092\u53d6\u5f97\u3057\u3066\u8868\u793a\u3002<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">setName<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"c1\">\/\/\u5f15\u6570\u3092\u53d7\u3051\u53d6\u3063\u3066\u305d\u306e\u5024\u3092\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u5165\u308c\u3066\u30bb\u30c3\u30bf\u30fc\u3092Nurse\u30af\u30e9\u30b9\u306epublic\u30e1\u30f3\u30d0\u3068\u3057\u3066\u4f5c\u6210\u3002<\/span>\r\n        <span class=\"c1\">\/\/name\u306f\u4eee\u5f15\u6570\u3068\u3057\u3066\u3001String\u65b9\u306e\u5024\u3092\u53d7\u3051\u53d6\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/span>\r\n        <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">name<\/span> <span class=\"o\">=<\/span> <span class=\"n\">name<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h3>9.3\u6784\u9020\u51fd\u6570\u7684\u57fa\u7840<\/p>\n<h4>\u4e86\u89e3\u6784\u9020\u51fd\u6570\u7684\u5de5\u4f5c\u539f\u7406<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u306f\u623b\u308a\u5024\u304c\u3042\u308a\u307e\u305b\u3093\u3002\uff08\u623b\u308a\u5024\u3092\u6307\u5b9a\u3067\u304d\u307e\u305b\u3093\u3002\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30af\u30e9\u30b9\u540d\u3092\u3092\u540d\u524d\u3068\u3057\u3066\u4f7f\u3044\u307e\u3059\u3002<\/ul>\n<h4>\u4e86\u89e3\u6784\u9020\u51fd\u6570\u7684\u4f5c\u7528<br \/>\n\u5f53\u521b\u5efa\u8be5\u7c7b\u7684\u5bf9\u8c61\u65f6\uff0c\u4f1a\u81ea\u52a8\u6267\u884c\u5728\u6784\u9020\u51fd\u6570\u4e2d\u5b9a\u4e49\u7684\u64cd\u4f5c\u3002<br \/>\n\u5728\u4f7f\u7528new\u5173\u952e\u5b57\u65f6\uff0c\u4ec5\u6267\u884c\u4e00\u6b21\u3002<br \/>\n\u4e0e\u65b9\u6cd5\u4e0d\u540c\uff0c\u65e0\u6cd5\u81ea\u7531\u5730\u81ea\u884c\u8c03\u7528\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5728\u6784\u9020\u51fd\u6570\u4e2d\uff0c\u901a\u5e38\u4f1a\u7f16\u5199\u4e00\u4e9b\u4ee3\u7801\u6765\u81ea\u52a8\u8bbe\u7f6e\u5bf9\u8c61\u6210\u5458\u7684\u521d\u59cb\u503c\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5c060\u4f5c\u4e3a\u6570\u5b57\u548c\u6c7d\u6cb9\u6570\u91cf\u7684\u521d\u59cb\u503c\u4ee3\u5165\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">class<\/span> <span class=\"nc\">Car<\/span>\r\n<span class=\"o\">{<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kt\">int<\/span> <span class=\"n\">num<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kt\">double<\/span> <span class=\"n\">gas<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"nf\">Car<\/span><span class=\"o\">()<\/span>\r\n    <span class=\"o\">{<\/span>\r\n        <span class=\"n\">num<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"n\">gas<\/span> <span class=\"o\">=<\/span> <span class=\"mf\">0.0<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"\u8eca\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\u3002\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">Sample4<\/span>\r\n<span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">Car<\/span> <span class=\"n\">car1<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Car<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"c1\">\/\/\u8eca\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\u3002\u3068num,gas\u306b\u5024\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u3002<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<\/code><\/pre>\n<h4>\u5728\u6784\u9020\u51fd\u6570\u524d\u9762\u6dfb\u52a0\u4fee\u9970\u7b26\u6784\u9020\u51fd\u6570\u53ef\u4ee5\u50cf\u65b9\u6cd5\u4e00\u6837\u4f7f\u7528public\u6216private\u4fee\u9970\u7b26\u3002\u5c06\u5176\u8bbe\u7f6e\u4e3aprivate\u540e\uff0c\u65e0\u6cd5\u5728\u7c7b\u7684\u5916\u90e8\u8c03\u7528\u8be5\u6784\u9020\u51fd\u6570\u6765\u521b\u5efa\u5bf9\u8c61\u3002<\/p>\n<h4>\u6784\u9020\u65b9\u6cd5\u4e0d\u9700\u8981void\u3002void\u5728\u8f6f\u4ef6\u5f00\u53d1\u4e2d\u8868\u793a\u4e0d\u8fd4\u56de\u4efb\u4f55\u503c\uff0c\u800c\u6784\u9020\u51fd\u6570\u5728\u58f0\u660e\u65f6\u4e0d\u6307\u5b9a\u8fd4\u56de\u503c\u7c7b\u578b\u3002<\/p>\n<h3>9.5 \u7c7b\u53d8\u91cf\uff0c\u7c7b\u65b9\u6cd5<\/p>\n<h4>\u7c7b\u53d8\u91cf\u548c\u7c7b\u65b9\u6cd5\u5b9e\u9645\u4e0a\uff0c\u5728\u7c7b\u4e2d\u53ef\u4ee5\u62e5\u6709\u4e0e\u5bf9\u8c61\u65e0\u5173\u7684\u6210\u5458\u3002\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u4e0e\u6574\u4e2a\u7c7b\u76f8\u5173\u3002\u4e0e\u7c7b\u5173\u8054\u7684\u5b57\u6bb5\u88ab\u79f0\u4e3a\u7c7b\u53d8\u91cf\uff0c\u65b9\u6cd5\u88ab\u79f0\u4e3a\u7c7b\u65b9\u6cd5\u3002<br \/>\n\u8fd9\u4e9b\u5b57\u6bb5\u548c\u65b9\u6cd5\u5728\u58f0\u660e\u548c\u5b9a\u4e49\u65f6\u9700\u8981\u52a0\u4e0astatic\u4fee\u9970\u7b26\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">class<\/span> <span class=\"nc\">\u30af\u30e9\u30b9\u540d<\/span>\r\n<span class=\"o\">{<\/span>\r\n  <span class=\"kd\">static<\/span> <span class=\"n\">\u578b\u540d<\/span> <span class=\"n\">\u30af\u30e9\u30b9\u5909\u6570\u540d<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u8bbf\u95ee\u7c7b\u53d8\u91cf\u65f6\uff0c<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">\u30af\u30e9\u30b9\u540d<\/span><span class=\"o\">.<\/span><span class=\"na\">\u30e1\u30f3\u30d0<\/span>\r\n<\/code><\/pre>\n<p>Java:<br \/>\nTest test1 = new Test();<br \/>\nSystem.out.print(Test.count_Test);<\/p>\n<p>Chinese:<br \/>\nJava:<br \/>\nTest test1 = new Test();<br \/>\nSystem.out.print(Test.count_Test);<\/p>\n<p>Chinese (Paraphrase):<br \/>\nJava:<br \/>\n\u58f0\u660e\u4e00\u4e2a\u540d\u4e3atest1\u7684Test\u5bf9\u8c61\uff1b<br \/>\n\u8f93\u51faTest\u7c7b\u7684count_Test\u5c5e\u6027\u3002<\/p>\n<h2>\u7b2c\u5341\u4e00\u8bfe \u65b0\u7684\u73ed\u7ea7<\/p>\n<h3>11.1\u7ee7\u627f\u53ef\u4ee5\u901a\u8fc7\u6269\u5c55\u4e00\u4e2a\u7c7b\u6765\u6784\u5efa\u53e6\u4e00\u4e2a\u7c7b\uff08extends\uff09\u3002<br \/>\n\u4f8b\u5982\uff0c\u57fa\u4e8e\u8f66\u7c7b\u53ef\u4ee5\u6784\u5efa\u8d5b\u8f66\u7c7b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">class<\/span> <span class=\"nc\">\u8eca<\/span>\r\n<span class=\"o\">{<\/span>\r\n    <span class=\"c1\">\/\/\u30ca\u30f3\u30d0\u30fc;<\/span>\r\n    <span class=\"c1\">\/\/\u30ac\u30be\u30ea\u30f3\u91cf;<\/span>\r\n    <span class=\"c1\">\/\/\u30ca\u30f3\u30d0\u30fc\u3068\u30ac\u30bd\u30ea\u30f3\u91cf\u3092\u8868\u793a\u3059\u308b\u6a5f\u80fd\u30fb\u30fb\u30fb<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">\u30ec\u30fc\u30b7\u30f3\u30b0\u30ab\u30fc<\/span> <span class=\"n\">\u62e1\u5f35\u3059\u308b<\/span> <span class=\"n\">\u8eca<\/span> \r\n<span class=\"o\">{<\/span>\r\n    <span class=\"c1\">\/\/\u7af6\u6280\u7528\u30b3\u30fc\u30b9;<\/span>\r\n    <span class=\"c1\">\/\/\u7af6\u6280\u7528\u30b3\u30fc\u30b9\u3092\u8868\u793a\u3059\u308b\u6a5f\u80fd\u30fb\u30fb\u30fb<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8f66\u7c7b -&gt; \u8d85\u7ea7\u7c7b<br \/>\n\u8d5b\u8f66\u7c7b -&gt; \u5b50\u7c7b<\/p>\n<h4>\u6269\u5c55\u4e00\u4e2a\u7c7b\u58f0\u660e\u5b50\u7c7b<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">class<\/span> <span class=\"nc\">\u30b5\u30d6\u30af\u30e9\u30b9\u540d<\/span> <span class=\"kd\">extends<\/span> <span class=\"n\">\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u540d<\/span>\r\n<span class=\"o\">{<\/span>\r\n    <span class=\"c1\">\/\/\u30b5\u30d6\u30af\u30e9\u30b9\u306b\u8ffd\u52a0\u3059\u308b\u30e1\u30f3\u30d0\u30fb\u30fb\u30fb<\/span>\r\n    <span class=\"c1\">\/\/\u30b5\u30d6\u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\uff08\u5f15\u6570\u30ea\u30b9\u30c8\uff09<\/span>\r\n    <span class=\"o\">{<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h3>11.4 \u7ee7\u627f Object \u7c7b\u53ef\u4ee5\u901a\u8fc7\u8fdb\u4e00\u6b65\u6269\u5c55\u5b50\u7c7b\u6765\u521b\u5efa\u65b0\u7684\u5b50\u7c7b\u3002<br \/>\n\u7136\u800c\uff0c\u5728Java\u4e2d\uff0c\u4e0d\u80fd\u5728\u4e00\u4e2a\u5b50\u7c7b\u4e2d\u7ee7\u627f\u591a\u4e2a\u8d85\u7c7b\u7684\u6210\u5458\u3002<\/p>\n<p>\u5c06Super Class 1\u548cSuper Class 2\u7ed3\u5408\u8d77\u6765\u7ee7\u627fSub Class\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528\u63a5\u53e3\u3002<\/p>\n<h4>\u4e86\u89e3\u5e76\u7814\u7a76Object\u7c7b\u7684\u673a\u5236\u5728Java\u4e2d\uff0c\u5982\u679c\u5728\u521b\u5efa\u7c7b\u65f6\u4e0d\u6307\u5b9a\u8d85\u7c7b\uff0c\u90a3\u4e48\u8be5\u7c7b\u88ab\u9ed8\u8ba4\u89c4\u5b9a\u4e3a\u5177\u6709\u540d\u4e3aObject\u7684\u7c7b\u4f5c\u4e3a\u8d85\u7c7b\u3002\u56e0\u6b64\uff0c\u6240\u6709\u7684Java\u7c7b\u90fd\u7ee7\u627f\u4e86Object\u7c7b\u7684\u6210\u5458\u3002<\/p>\n<h4>\u5c06toString\u65b9\u6cd5\u7ffb\u8bd1\u4e3a\u4e2d\u6587\u8fd4\u56de\u5c06\u5bf9\u8c61\u8868\u793a\u4e3a\u5b57\u7b26\u4e32\u7684\u7ed3\u679c\u4f5c\u4e3a\u8fd4\u56de\u503c\u3002<br \/>\n\u5728\u8fdb\u884c\u5bf9\u8c61\u7684\u8f93\u51fa\u5904\u7406\u65f6\uff0c\u5c06\u8c03\u7528\u6b64\u65b9\u6cd5\u3002<br \/>\n\u7279\u522b\u662f\u5728\u6ca1\u6709\u4efb\u4f55\u51c6\u5907\u7684\u60c5\u51b5\u4e0b\uff0c\u5c06\u8c03\u7528\u7ee7\u627f\u81eaObject\u7c7b\u7684toString\u65b9\u6cd5\u3002\u7136\u540e\u663e\u793a\u7684\u662f\u8be5toString()\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\uff0c\u5373\u683c\u5f0f\u4e3a&#8221;\u5305\u540d\u7c7b\u540d@\u6570\u5b57&#8221;\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<p>\u7136\u800c\uff0c\u5982\u679c\u5728\u81ea\u5b9a\u4e49\u7c7b\u4e2d\u5b9a\u4e49\uff08\u8986\u76d6\uff09toString()\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u5b9a\u8868\u793a\u5bf9\u8c61\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<h2>\u7b2c12\u8ab2 &#8211; \u4ecb\u9762<\/p>\n<h3>12.1 \u62bd\u8c61\u7c7b<\/p>\n<h4>\u4e86\u89e3\u62bd\u8c61\u7c7b\u7684\u673a\u5236\u62bd\u8c61\u7c7b\u3002\u5728\u8fd9\u91cc\uff0c\u4e0d\u80fd\u521b\u5efa\u62bd\u8c61\u7c7b\u7684\u5bf9\u8c61\u3002<\/p>\n<p>\u6211\u6709\u4e00\u4e2a\u672a\u5b9a\u4e49\u5904\u7406\u5185\u5bb9\u7684\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">abstract<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">\u30af\u30e9\u30b9\u540d<\/span>\r\n<span class=\"o\">{<\/span>\r\n    <span class=\"c1\">\/\/\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5ba3\u8a00;<\/span>\r\n    <span class=\"c1\">\/\/abstract \u623b\u308a\u5024\u306e\u578b \u30e1\u30bd\u30c3\u30c9\u540d(\u5f15\u6570\u30ea\u30b9\u30c8);<\/span>\r\n\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h4>\u4f7f\u7528\u62bd\u8c61\u7c7b\u62bd\u8c61\u7c7b\u9700\u8981\u5728\u5b50\u7c7b\u4e2d\u6b63\u786e\u5b9a\u4e49\u548c\u8986\u76d6\u7ee7\u627f\u7684\u62bd\u8c61\u65b9\u6cd5\u3002<br \/>\n\u62bd\u8c61\u7c7b\u7684\u5b58\u5728\u662f\u4e3a\u4e86\u5b9e\u73b0\u7ee7\u627f\u3002<\/p>\n<h3>12.2 \u63a5\u53e3\u5728Java\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u63a5\u53e3\uff08interface\uff09\u8fd9\u4e2a\u6982\u5ff5\u6765\u8868\u793a\u7c7b\u4f3c\u4e8e\u62bd\u8c61\u7c7b\u7684\u673a\u5236\u3002<\/p>\n<p>\u63a5\u53e3\u58f0\u660e<\/p>\n<pre class=\"post-pre\"><code>interface iVehicle\r\n{\r\n    void show();\r\n}\r\n\r\n\u2193\r\n\r\ninterface \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u540d\r\n{\r\n    \u578b\u540d \u30d5\u30a3\u30fc\u30eb\u30c9\u540d = \u5f0f;\r\n    \u623b\u308a\u5024\u306e\u578b \u30e1\u30bd\u30c3\u30c9\u540d();\r\n}\r\n<\/code><\/pre>\n<p>\u63a5\u53e3\u53ef\u4ee5\u62e5\u6709\u5b57\u6bb5\u548c\u65b9\u6cd5\uff0c\u4f46\u5b83\u6ca1\u6709\u6784\u9020\u51fd\u6570\u3002<br \/>\n\u53e6\u5916\uff0c\u63a5\u53e3\u5f88\u50cf\u7c7b\uff0c\u4f46\u4e0d\u80fd\u521b\u5efa\u5bf9\u8c61\u3002<br \/>\n\u4e5f\u5c31\u662f\u8bf4\uff0c\u65e0\u6cd5\u4f7f\u7528&#8221;new&#8221;\u6765\u521b\u5efa\u5bf9\u8c61\u3002<\/p>\n<h4>\u5b9e\u73b0\u63a5\u53e3<\/p>\n<pre class=\"post-pre\"><code>class Car implements iVehicle\r\n\/\/class \u30af\u30e9\u30b9\u540d implements \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u540d\r\n{\r\n\r\n}\r\n<\/code><\/pre>\n<p>\u5728Car\u7c7b\u4e2d\uff0c\u8981\u5b9e\u73b0iVehicle\u63a5\u53e3\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\u3002<br \/>\n\u8fd9\u6837\u4e00\u6765\uff0cCar\u7c7b\u5c06\u7ee7\u627fiVehicle\u63a5\u53e3\u62e5\u6709\u7684\u5b57\u6bb5\uff08\u5e38\u91cf\uff09\u548c\u65b9\u6cd5\u540d\u3002<\/p>\n<p>\u63a5\u53e3\u7c7b\u578b\u7684\u6570\u7ec4\u53ef\u4ee5\u6307\u5411\u5b9e\u73b0\u8be5\u63a5\u53e3\u7684\u5b50\u7c7b\u5bf9\u8c61\u3002<\/p>\n<p>\u63a5\u53e3\u7684\u5b57\u6bb5\u90fd\u662f\u5e38\u6570\uff0c\u65b9\u6cd5\u90fd\u662f\u62bd\u8c61\u65b9\u6cd5\u3002\u4e0e\u62bd\u8c61\u7c7b\uff08Vehicle\uff09\u7c7b\u4f3c\uff0c\u65e0\u6cd5\u4e3a\u53ef\u53d8\u5b57\u6bb5\uff08\u5982speed\uff09\u6216\u5177\u6709\u5b9a\u4e49\u7684setSpeed\u65b9\u6cd5\u7b49\u6210\u5458\u6dfb\u52a0\u503c\uff0c\u6240\u4ee5\u8bf7\u6ce8\u610f\u3002<\/p>\n<h3>14 \u4f8b\u5916\u548c\u8f93\u5165\u8f93\u51fa\u5904\u7406\u5982\u679c\u5728\u65b9\u6cd5\u5185\u7684try\u5757\u4e2d\u4e0d\u8bbe\u7f6e\u53d8\u91cf\uff0c\u5c31\u65e0\u6cd5\u4f7f\u7528\u8be5\u53d8\u91cf\u3002<\/p>\n<h4>\u5927\u81f4\u7684\u4f8b\u5916\u79cd\u7c7b<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">try{}catch(exception)\u2192try\u5185\u3067\u767a\u751f\u3057\u305f\u4f8b\u5916\u3092catch\u3067\u5bfe\u5fdc\u3002catch\u306f\u3001\u7121\u9650\u306b\u5bfe\u5fdc\u53ef\u80fd\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">throw\u2192exception\u3092\u767a\u751f\u3055\u305b\u308b\u3002\u610f\u56f3\u7684\u306b\u305d\u306e\u5834\u3067\u767a\u751f\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">throws\u2192\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306e\u53f3\u306b\u66f8\u3044\u3066\u3001\u547c\u3073\u51fa\u3057\u5143\u306b\u4e38\u6295\u3052\u3059\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">RuntimeException\u2192\u5bfe\u5fdcOK\u306a\u4f8b\u5916\u3002<\/ul>\n<h3>14.2\u5f02\u5e38\u548c\u7c7b<\/p>\n<h4>\u4e86\u89e3\u5e76\u5256\u6790\u4f8b\u5916\u7684\u7c7b\u522b\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0a2e37434c4406be3812\/78-0.png\" alt=\"exception.png\" \/>Trowable\u7c7b\u884d\u751f\u51fa\u4e86Error\u7c7b\u548cException\u7c7b\u3002Error\u7c7b\u8868\u793a\u7a0b\u5e8f\u65e0\u6cd5\u7ee7\u7eed\u6267\u884c\u7684\u9519\u8bef\uff0c\u901a\u5e38\u4e0d\u8fdb\u884c\u5f02\u5e38\u5904\u7406\u3002<\/p>\n<h4>14.3 \u5f02\u5e38\u629b\u51fa\u8981\u521b\u5efa\u81ea\u5df1\u7684\u5f02\u5e38\u7c7b\uff0c\u9700\u8981\u6269\u5c55Throwable\u7c7b\u7684\u5b50\u7c7b\u5e76\u58f0\u660e\u5f02\u5e38\u7c7b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">class<\/span> <span class=\"nc\">CarException<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">Exception<\/span>\r\n<span class=\"c1\">\/\/Exception\u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3057\u3066\u72ec\u81ea\u306e\u4f8b\u5916\u30af\u30e9\u30b9\u3092\u5ba3\u8a00\u3057\u3066\u3044\u307e\u3059\u3002<\/span>\r\n<\/code><\/pre>\n<p>\u53ef\u629b\u51fa\u7684<br \/>\n\u2193<br \/>\n\u6c7d\u8f66\u5f02\u5e38<\/p>\n<p>\u4f60\u53ef\u4ee5\u6269\u5c55Throwable\u7c7b\u7684\u5b50\u7c7b\u6765\u58f0\u660e\u81ea\u5b9a\u4e49\u7684\u5f02\u5e38\u7c7b\u3002<\/p>\n<h4>\u53ea\u9488\u5bf9\u72ec\u7acb\u7684\u5f02\u5e38\u7c7b<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/\u4f8b\u5916\u306e\u30ed\u30b8\u30c3\u30af\u3060\u3051\u3092\u5225\u306e\u4f8b\u5916\u30af\u30e9\u30b9\u306b\u8a18\u8ff0\u3002<\/span>\r\n<span class=\"kd\">public<\/span>  <span class=\"n\">take<\/span> <span class=\"nf\">testMethod<\/span><span class=\"o\">(<\/span><span class=\"n\">\u5224\u5b9a\u3057\u305f\u3044\u30af\u30e9\u30b9<\/span> <span class=\"n\">\u5024<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">throws<\/span> <span class=\"nc\">CriticaltestMethod<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"c1\">\/\/testMethod\u306f\u4f8b\u5916\u3092\u9001\u51fa\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3002throws\u304c\u4f8b\u5916\u3092\u9001\u51fa\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3068\u5ba3\u8a00\u3002CriticaltestMethod\u306f\u4f8b\u5916\u30af\u30e9\u30b9\u3002<\/span>\r\n    <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"mi\">0<\/span> <span class=\"o\">&gt;<\/span> <span class=\"n\">child<\/span><span class=\"o\">.<\/span><span class=\"na\">getAge<\/span><span class=\"o\">())<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"c1\">\/\/\u4f8b\u5916\u3067\u30fc\u3059\u3002<\/span>\r\n        <span class=\"k\">throw<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">CriticaltestMethod<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"c1\">\/\/\u6761\u4ef6\u306b\u3042\u3063\u305f\u306e\u3067\u3001\u4f8b\u5916\u306e\u9001\u51fa\u3002<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">else<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"c1\">\/\/\u4f8b\u5916\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u5907\u5fd8\u5f55<\/p>\n<h4>\u4ee5\u4e0b\u662f\u7528\u4e2d\u6587\u5bf9\u5176\u8fdb\u884c\u7684\u91ca\u4e49\uff0c\u4ec5\u63d0\u4f9b\u4e00\u79cd\u9009\u9879\uff1a\u65e0\u8fd4\u56de\u503c<\/p>\n<p>\u6ca1\u6709\u5f62\u72b6\u7684\u610f\u601d\u3002<\/p>\n<h4>\u5728\u6784\u9020\u51fd\u6570\u4e2d\u52a0\u4e0a\u4fee\u9970\u7b26\u3002<\/p>\n<h5>\u4fdd\u62a4\u65e0\u6cd5\u8bbf\u95ee\u8d85\u7c7b\u7684\u79c1\u6709\u6210\u5458\u3002\u56e0\u6b64\uff0c\u53ef\u4ee5\u901a\u8fc7\u6307\u5b9a\u4e3aprotected\u6765\u8bbf\u95ee\u5b57\u6bb5\u3002<\/p>\n<h4>\u5b9e\u4f8b\u548c\u5bf9\u8c61\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f\u6c7d\u8f66 car1 = new \u6c7d\u8f66();<br \/>\n\u4e0a\u8ff0\u662fcar1\u7684\u5b9e\u4f8b\u3002\u6c7d\u8f66\u7c7b\u662f\u6c7d\u8f66\u7684\u62bd\u8c61\u3002\u6c7d\u8f66\u7c7b\u662f\u4e00\u4e2a\u8bbe\u8ba1\u84dd\u56fe\u3002<\/p>\n<h3>\u4fee\u98fe\u5b50<\/p>\n<h4>\u5728\u58f0\u660e\u7c7b\u65f6\u4f7f\u7528final\u3002\u5982\u679c\u7ed9\u7c7b\u6dfb\u52a0final\u4fee\u9970\u7b26\u6765\u58f0\u660e\uff0c\u90a3\u4e48\u8be5\u7c7b\u5c06\u65e0\u6cd5\u5728\u5b50\u7c7b\u4e2d\u7ee7\u627f\u3002\u4f7f\u7528final\u7684\u4e00\u4e2a\u539f\u56e0\u662f\u51fa\u4e8e\u5b89\u5168\u6027\u8003\u8651\u3002\u4f5c\u4e3a\u9ed1\u5ba2\u8bd5\u56fe\u7ed9\u7a0b\u5e8f\u5e26\u6765\u6076\u610f\u884c\u4e3a\u7684\u624b\u6bb5\u4e4b\u4e00\uff0c\u4ed6\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u7c7b\u7684\u5b50\u7c7b\uff0c\u5e76\u5728\u8be5\u5b50\u7c7b\u4e2d\u7f16\u5199\u6267\u884c\u4e0d\u826f\u884c\u4e3a\u7684\u4ee3\u7801\u3002\u901a\u8fc7\u521b\u5efa\u5b50\u7c7b\uff0c\u53ef\u4ee5\u8ba9\u8be5\u7c7b\u6267\u884c\u4e0e\u8d85\u7c7b\u9884\u671f\u5b8c\u5168\u4e0d\u540c\u7684\u64cd\u4f5c\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u4e3a\u4e86\u9884\u9632\u6280\u672f\u80fd\u529b\u8f83\u5f31\u7684\u4eba\u521b\u5efa\u5b50\u7c7b\u5e76\u4ea7\u751f\u610f\u5916\u884c\u4e3a\u7684\u7a0b\u5e8f\uff0cfinal\u4fee\u9970\u7b26\u4e5f\u88ab\u7528\u6765\u9632\u6b62\u521b\u5efaString\u7c7b\u548cMath\u7c7b\u7b49Java\u4e2d\u5df2\u7ecf\u9884\u5b9a\u4e49\u7684\u7c7b\u7684\u5b50\u7c7b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u8c08\u8bbaJava\u4e4b\u524d\u4f7f\u7528Java\u505a\u4ec0\u4e48\uff1f \u4f7f\u7528Java\uff0c\u5728\u4e09\u5c42\u7ed3\u6784\u4e2d\uff0c\u5f53\u9700\u8981\u8fdb\u884c\u52a8\u6001\u5904\u7406\u65f6\uff0c\u5411\u5e94\u7528\u670d\u52a1\u5668\u53d1\u9001\u8bf7\u6c42 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31037","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5173\u4e8eJava - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e\u5173\u4e8eJava\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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