{"id":226,"date":"2023-06-27T18:44:46","date_gmt":"2023-03-03T02:01:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java-%e5%8d%95%e4%be%8b%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e7%9a%84%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5%e5%92%8c%e7%a4%ba%e4%be%8b\/"},"modified":"2025-08-01T02:37:56","modified_gmt":"2025-07-31T18:37:56","slug":"java-%e5%8d%95%e4%be%8b%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e7%9a%84%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5%e5%92%8c%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e5%8d%95%e4%be%8b%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e7%9a%84%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5%e5%92%8c%e7%a4%ba%e4%be%8b\/","title":{"rendered":"Java\u5355\u4f8b\u6a21\u5f0f\uff1a\u6700\u4f73\u5b9e\u8df5\u3001\u8bbe\u8ba1\u539f\u5219\u4e0e\u4ee3\u7801\u793a\u4f8b"},"content":{"rendered":"<h3>\u5f15\u8a00<\/h3>\n<p>Java\u5355\u4f8b\u6a21\u5f0f\u662f\u201c\u56db\u4eba\u5e2e\u201d\uff08Gang of Four, GoF\uff09\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u4e00\uff0c\u5c5e\u4e8e\u521b\u5efa\u578b\u8bbe\u8ba1\u6a21\u5f0f\u3002\u4ece\u5b9a\u4e49\u4e0a\u770b\uff0c\u5b83\u4f3c\u4e4e\u662f\u4e00\u4e2a\u7b80\u5355\u76f4\u63a5\u7684\u8bbe\u8ba1\u6a21\u5f0f\uff0c\u4f46\u5728\u5b9e\u9645\u5b9e\u73b0\u65f6\u5374\u6d89\u53ca\u8bb8\u591a\u9700\u8981\u8003\u8651\u7684\u56e0\u7d20\u3002<\/p>\n<p>\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u5c06\u6df1\u5165\u5b66\u4e60\u5355\u4f8b\u8bbe\u8ba1\u6a21\u5f0f\u7684\u539f\u5219\uff0c\u63a2\u7d22\u4e0d\u540c\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u5e76\u5206\u4eab\u4e00\u4e9b\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n<h2>\u5355\u4f8b\u6a21\u5f0f\u539f\u5219<\/h2>\n<ul class=\"post-ul\">\n<li>\u5355\u4f8b\u6a21\u5f0f\u9650\u5236\u4e86\u7c7b\u7684\u5b9e\u4f8b\u5316\uff0c\u5e76\u786e\u4fdd\u5728Java\u865a\u62df\u673a\uff08JVM\uff09\u4e2d\u53ea\u5b58\u5728\u8be5\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/li>\n<li>\u5355\u4f8b\u7c7b\u5fc5\u987b\u63d0\u4f9b\u4e00\u4e2a\u5168\u5c40\u8bbf\u95ee\u70b9\uff0c\u4ee5\u4fbf\u83b7\u53d6\u8be5\u7c7b\u7684\u5b9e\u4f8b\u3002<\/li>\n<li>\u5355\u4f8b\u6a21\u5f0f\u5e38\u7528\u4e8e\u65e5\u5fd7\u8bb0\u5f55\u3001\u9a71\u52a8\u5bf9\u8c61\u3001\u7f13\u5b58\u4ee5\u53ca\u7ebf\u7a0b\u6c60\u7b49\u573a\u666f\u3002<\/li>\n<li>\u5355\u4f8b\u8bbe\u8ba1\u6a21\u5f0f\u4e5f\u5e94\u7528\u4e8e\u5176\u4ed6\u8bbe\u8ba1\u6a21\u5f0f\u4e2d\uff0c\u4f8b\u5982\u62bd\u8c61\u5de5\u5382\uff08Abstract Factory\uff09\u3001\u5efa\u9020\u8005\uff08Builder\uff09\u3001\u539f\u578b\uff08Prototype\uff09\u3001\u5916\u89c2\uff08Facade\uff09\u7b49\u3002<\/li>\n<li>\u5355\u4f8b\u8bbe\u8ba1\u6a21\u5f0f\u5728Java\u6838\u5fc3\u7c7b\u5e93\u4e2d\u4e5f\u6709\u5e94\u7528\uff08\u4f8b\u5982\uff0c<code>java.lang.Runtime<\/code>, <code>java.awt.Desktop<\/code>\uff09\u3002<\/li>\n<\/ul>\n<h2>Java \u5355\u4f8b\u6a21\u5f0f\u7684\u5b9e\u73b0\u65b9\u5f0f<\/h2>\n<p>\u4e3a\u4e86\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\uff0c\u6211\u4eec\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u4f46\u5b83\u4eec\u90fd\u9075\u5faa\u4ee5\u4e0b\u5171\u540c\u6982\u5ff5\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><strong>\u79c1\u6709\u6784\u9020\u51fd\u6570\uff1a<\/strong> \u9650\u5236\u5176\u4ed6\u7c7b\u5b9e\u4f8b\u5316\u8be5\u5355\u4f8b\u7c7b\u3002<\/li>\n<li><strong>\u79c1\u6709\u9759\u6001\u53d8\u91cf\uff1a<\/strong> \u8be5\u53d8\u91cf\u662f\u5355\u4f8b\u7c7b\u7684\u552f\u4e00\u5b9e\u4f8b\u3002<\/li>\n<li><strong>\u516c\u5171\u9759\u6001\u65b9\u6cd5\uff1a<\/strong> \u8fd4\u56de\u5355\u4f8b\u7c7b\u7684\u5b9e\u4f8b\uff0c\u8fd9\u662f\u5916\u90e8\u4e16\u754c\u83b7\u53d6\u5355\u4f8b\u7c7b\u5b9e\u4f8b\u7684\u5168\u5c40\u8bbf\u95ee\u70b9\u3002<\/li>\n<\/ul>\n<p>\u5728\u63a5\u4e0b\u6765\u7684\u90e8\u5206\uff0c\u6211\u4eec\u5c06\u5b66\u4e60\u5355\u4f8b\u6a21\u5f0f\u7684\u4e0d\u540c\u5b9e\u73b0\u65b9\u6cd5\u4ee5\u53ca\u5b9e\u73b0\u4e2d\u7684\u8bbe\u8ba1\u8003\u8651\u4e8b\u9879\u3002<\/p>\n<h2>1. \u997f\u6c49\u5f0f\u521d\u59cb\u5316\uff08Eager Initialization\uff09<\/h2>\n<p>\u5728\u997f\u6c49\u5f0f\u521d\u59cb\u5316\u4e2d\uff0c\u5355\u4f8b\u7c7b\u7684\u5b9e\u4f8b\u5728\u7c7b\u52a0\u8f7d\u65f6\u5373\u88ab\u521b\u5efa\u3002\u997f\u6c49\u5f0f\u521d\u59cb\u5316\u7684\u7f3a\u70b9\u662f\uff0c\u5373\u4f7f\u5ba2\u6237\u7aef\u5e94\u7528\u7a0b\u5e8f\u53ef\u80fd\u4e0d\u4f7f\u7528\u8be5\u5b9e\u4f8b\uff0c\u5b83\u4ecd\u7136\u4f1a\u88ab\u521b\u5efa\u3002\u4ee5\u4e0b\u662f\u9759\u6001\u521d\u59cb\u5316\u5355\u4f8b\u7c7b\u7684\u5b9e\u73b0\u65b9\u5f0f\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span> instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token comment\">\/\/ \u79c1\u6709\u6784\u9020\u51fd\u6570\uff0c\u9632\u6b62\u5ba2\u6237\u7aef\u5e94\u7528\u7a0b\u5e8f\u76f4\u63a5\u4f7f\u7528\u6784\u9020\u51fd\u6570\u521b\u5efa\u5b9e\u4f8b<\/span>\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{}<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u60a8\u7684\u5355\u4f8b\u7c7b\u4e0d\u5360\u7528\u5927\u91cf\u8d44\u6e90\uff0c\u90a3\u4e48\u997f\u6c49\u5f0f\u521d\u59cb\u5316\u662f\u4e00\u79cd\u53ef\u884c\u7684\u9009\u62e9\u3002\u4f46\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u5355\u4f8b\u7c7b\u662f\u4e3a\u6587\u4ef6\u7cfb\u7edf\u3001\u6570\u636e\u5e93\u8fde\u63a5\u7b49\u8d44\u6e90\u521b\u5efa\u7684\u3002\u9664\u975e\u5ba2\u6237\u7aef\u8c03\u7528<code>getInstance<\/code>\u65b9\u6cd5\uff0c\u6211\u4eec\u5e94\u5c3d\u91cf\u907f\u514d\u63d0\u524d\u5b9e\u4f8b\u5316\u3002\u6b64\u5916\uff0c\u6b64\u65b9\u6cd5\u6ca1\u6709\u63d0\u4f9b\u4efb\u4f55\u5f02\u5e38\u5904\u7406\u9009\u9879\u3002<\/p>\n<h2>2. \u9759\u6001\u5757\u521d\u59cb\u5316\uff08Static Block Initialization\uff09<\/h2>\n<p><strong>\u9759\u6001\u5757\u521d\u59cb\u5316<\/strong>\u4e0e<strong>\u997f\u6c49\u5f0f\u521d\u59cb\u5316<\/strong>\u7c7b\u4f3c\uff0c\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\u7c7b\u7684\u5b9e\u4f8b\u662f\u5728\u9759\u6001\u5757\u4e2d\u521b\u5efa\u7684\uff0c\u8fd9\u63d0\u4f9b\u4e86\u5904\u7406\u5f02\u5e38\u7684\u9009\u9879\u3002<\/p>\n<pre class=\"post-pre\"><code class=\"language-java\"><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">StaticBlockSingleton<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">StaticBlockSingleton<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">StaticBlockSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token comment\">\/\/ \u9759\u6001\u5757\u521d\u59cb\u5316\uff0c\u7528\u4e8e\u5f02\u5e38\u5904\u7406<\/span>\r\n    <span class=\"token keyword\">static<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span>\r\n            instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">StaticBlockSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RuntimeException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"\u521b\u5efa\u5355\u4f8b\u5b9e\u4f8b\u65f6\u53d1\u751f\u5f02\u5e38\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">StaticBlockSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u65e0\u8bba\u662f\u997f\u6c49\u5f0f\u521d\u59cb\u5316\u8fd8\u662f\u9759\u6001\u5757\u521d\u59cb\u5316\uff0c\u5b83\u4eec\u90fd\u4f1a\u5728\u7c7b\u52a0\u8f7d\u65f6\u5c31\u521b\u5efa\u5b9e\u4f8b\uff0c\u5373\u4f7f\u5728\u5b9e\u4f8b\u88ab\u4f7f\u7528\u4e4b\u524d\u3002\u8fd9\u901a\u5e38\u4e0d\u662f\u6700\u4f73\u5b9e\u8df5\uff0c\u56e0\u4e3a\u5b83\u53ef\u80fd\u5bfc\u81f4\u4e0d\u5fc5\u8981\u7684\u8d44\u6e90\u5360\u7528\u3002<\/p>\n<h2>3. \u61d2\u6c49\u5f0f\u521d\u59cb\u5316\uff08\u5ef6\u8fdf\u52a0\u8f7d\uff09<\/h2>\n<p><strong>\u61d2\u6c49\u5f0f\u521d\u59cb\u5316<\/strong>\uff08\u6216\u79f0<strong>\u5ef6\u8fdf\u52a0\u8f7d<\/strong>\uff09\u662f\u4e00\u79cd\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u7684\u65b9\u6cd5\uff0c\u5b83\u5728\u5168\u5c40\u8bbf\u95ee\u65b9\u6cd5\u88ab\u9996\u6b21\u8c03\u7528\u65f6\u624d\u521b\u5efa\u5b9e\u4f8b\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\u521b\u5efa\u5355\u4f8b\u7c7b\u7684\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n<pre class=\"post-pre\"><code class=\"language-java\"><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LazyInitializedSingleton<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">LazyInitializedSingleton<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">LazyInitializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">LazyInitializedSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LazyInitializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u4e0a\u8ff0\u5b9e\u73b0\u662f\u6709\u6548\u7684\u3002\u7136\u800c\uff0c\u5f53\u6d89\u53ca\u5230\u591a\u7ebf\u7a0b\u7cfb\u7edf\u65f6\uff0c\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8fdb\u5165 <code>if (instance == null)<\/code> \u6761\u4ef6\u5757\uff0c\u5c31\u4f1a\u51fa\u73b0\u95ee\u9898\u3002\u8fd9\u5c06\u7834\u574f\u5355\u4f8b\u6a21\u5f0f\uff0c\u5bfc\u81f4\u4e24\u4e2a\u7ebf\u7a0b\u83b7\u53d6\u5230\u4e0d\u540c\u7684\u5355\u4f8b\u7c7b\u5b9e\u4f8b\u3002\u5728\u63a5\u4e0b\u6765\u7684\u7ae0\u8282\u4e2d\uff0c\u6211\u4eec\u5c06\u63a2\u8ba8\u521b\u5efa\u7ebf\u7a0b\u5b89\u5168\u5355\u4f8b\u7c7b\u7684\u4e0d\u540c\u65b9\u6cd5\u3002<\/p>\n<h2>4. \u7ebf\u7a0b\u5b89\u5168\u7684\u5355\u4f8b\u6a21\u5f0f<\/h2>\n<h3>3. \u7ebf\u7a0b\u5b89\u5168\u7684\u5355\u4f8b\u6a21\u5f0f<\/h3>\n<p>\u521b\u5efa\u7ebf\u7a0b\u5b89\u5168\u7684\u5355\u4f8b\u7c7b\uff0c\u4e00\u79cd\u7b80\u5355\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u5c06\u5168\u5c40\u8bbf\u95ee\u65b9\u6cd5\uff08\u5373<code>getInstance()<\/code>\u65b9\u6cd5\uff09\u8bbe\u4e3a\u540c\u6b65\uff08<code>synchronized<\/code>\uff09\u65b9\u6cd5\u3002\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u5728\u4efb\u4f55\u7ed9\u5b9a\u65f6\u523b\uff0c\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u591f\u6267\u884c\u8be5\u65b9\u6cd5\uff0c\u4ece\u800c\u907f\u514d\u4e86\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u521b\u5efa\u5b9e\u4f8b\u7684\u95ee\u9898\u3002\u4ee5\u4e0b\u662f\u8fd9\u79cd\u65b9\u6cd5\u7684\u5178\u578b\u5b9e\u73b0\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span> <span class=\"token punctuation\">{\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span> instance<span class=\"token punctuation\">;\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{}\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n            instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n        }\r\n        <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;\r\n    }\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u5b9e\u73b0\u867d\u7136\u6709\u6548\u5730\u4fdd\u8bc1\u4e86\u7ebf\u7a0b\u5b89\u5168\uff0c\u4f46\u7531\u4e8e<code>synchronized<\/code>\u5173\u952e\u5b57\u5e26\u6765\u7684\u6027\u80fd\u5f00\u9500\uff0c\u5b83\u5728\u5e76\u53d1\u91cf\u5927\u65f6\u53ef\u80fd\u4f1a\u964d\u4f4e\u7a0b\u5e8f\u7684\u6267\u884c\u6548\u7387\u3002\u8fd9\u79cd\u5f00\u9500\u662f\u6301\u7eed\u5b58\u5728\u7684\uff0c\u5373\u4f7f\u5728\u5355\u4f8b\u5b9e\u4f8b\u5df2\u7ecf\u521b\u5efa\u4e4b\u540e\uff0c\u6bcf\u6b21\u8c03\u7528<code>getInstance()<\/code>\u65b9\u6cd5\u90fd\u4f1a\u8fdb\u884c\u540c\u6b65\u3002\u7136\u800c\uff0c\u6211\u4eec\u5b9e\u9645\u4e0a\u53ea\u9700\u8981\u5728\u5355\u4f8b\u5b9e\u4f8b\u9996\u6b21\u521b\u5efa\u65f6\u624d\u9700\u8981\u540c\u6b65\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5e76\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u635f\u8017\uff0c\u6211\u4eec\u53ef\u4ee5\u91c7\u7528<strong>\u53cc\u91cd\u68c0\u67e5\u9501\u5b9a\uff08Double-Checked Locking\uff09<\/strong>\u539f\u5219\u3002<\/p>\n<p>\u53cc\u91cd\u68c0\u67e5\u9501\u5b9a\u901a\u8fc7\u5728\u540c\u6b65\u5757\u5185\u90e8\u518d\u6b21\u8fdb\u884c\u5b9e\u4f8b\u662f\u5426\u4e3a\u7a7a\u7684\u68c0\u67e5\uff0c\u786e\u4fdd\u53ea\u6709\u5728\u5b9e\u4f8b\u5c1a\u672a\u521b\u5efa\u65f6\u624d\u8fdb\u5165\u540c\u6b65\u5757\uff0c\u5e76\u4e14\u5728\u540c\u6b65\u5757\u5185\u90e8\u518d\u6b21\u68c0\u67e5\u4ee5\u9632\u6b62\u91cd\u590d\u521b\u5efa\u3002\u8fd9\u6837\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u540c\u6b65\u7684\u5f00\u9500\uff0c\u63d0\u9ad8\u6027\u80fd\u3002\u4ee5\u4e0b\u4ee3\u7801\u7247\u6bb5\u5c55\u793a\u4e86\u53cc\u91cd\u68c0\u67e5\u9501\u5b9a\u7684\u5b9e\u73b0\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span> <span class=\"token function\">getInstanceUsingDoubleLocking<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n        <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ThreadSafeSingleton<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">==<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{\r\n                instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ThreadSafeSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;\r\n            }\r\n        }\r\n    }\r\n    <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;\r\n}<\/span>\r\n<\/code><\/pre>\n<p>\u7ee7\u7eed\u5b66\u4e60\u7ebf\u7a0b\u5b89\u5168\u7684\u5355\u4f8b\u6a21\u5f0f\u7684\u5176\u4ed6\u5b9e\u73b0\u65b9\u5f0f\u3002<\/p>\n<h2>4. \u997f\u6c49\u5f0f\u5355\u4f8b\u6a21\u5f0f<\/h2>\n<h2>5. \u9759\u6001\u5185\u90e8\u7c7b\u5355\u4f8b\u6a21\u5f0f\uff08Bill Pugh Singleton Implementation\uff09<\/h2>\n<p>\u5728Java 5\u4e4b\u524d\uff0cJava\u5185\u5b58\u6a21\u578b\u5b58\u5728\u8bf8\u591a\u95ee\u9898\uff0c\u5e76\u4e14\u5148\u524d\u7684\u5355\u4f8b\u5b9e\u73b0\u65b9\u6cd5\u5728\u591a\u7ebf\u7a0b\u5e76\u53d1\u83b7\u53d6\u5355\u4f8b\u5b9e\u4f8b\u65f6\u53ef\u80fd\u4f1a\u51fa\u73b0\u6545\u969c\u3002\u56e0\u6b64\uff0cBill Pugh\u63d0\u51fa\u4e86\u4e00\u79cd\u4e0d\u540c\u7684\u5355\u4f8b\u6a21\u5f0f\u5b9e\u73b0\u65b9\u5f0f\uff0c\u5373\u5229\u7528\u5185\u90e8\u9759\u6001\u8f85\u52a9\u7c7b\u3002\u4ee5\u4e0b\u662fBill Pugh\u5355\u4f8b\u6a21\u5f0f\u7684\u5b9e\u73b0\u793a\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">BillPughSingleton<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">BillPughSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SingletonHelper<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">BillPughSingleton<\/span> <span class=\"token constant\">INSTANCE<\/span> <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">BillPughSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">BillPughSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">SingletonHelper<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">INSTANCE<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8bf7\u6ce8\u610f\u4ee3\u7801\u4e2d\u79c1\u6709\u7684\u5185\u90e8\u9759\u6001\u7c7b<code>SingletonHelper<\/code>\uff0c\u5b83\u5305\u542b\u4e86\u5355\u4f8b\u7c7b\u7684\u5b9e\u4f8b\u3002\u5f53<code>BillPughSingleton<\/code>\u7c7b\u88ab\u52a0\u8f7d\u65f6\uff0c<code>SingletonHelper<\/code>\u7c7b\u5e76\u4e0d\u4f1a\u7acb\u5373\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u3002\u53ea\u6709\u5f53\u9996\u6b21\u8c03\u7528<code>getInstance()<\/code>\u65b9\u6cd5\u65f6\uff0c<code>SingletonHelper<\/code>\u7c7b\u624d\u4f1a\u88ab\u52a0\u8f7d\uff0c\u5e76\u521b\u5efa<code>BillPughSingleton<\/code>\u7684\u5b9e\u4f8b\u3002\u8fd9\u79cd\u65b9\u6cd5\u662f\u76ee\u524d\u6700\u5e38\u7528\u7684\u5355\u4f8b\u6a21\u5f0f\u5b9e\u73b0\u65b9\u5f0f\uff0c\u56e0\u4e3a\u5b83\u65e0\u9700\u540c\u6b65\uff0c\u4ece\u800c\u907f\u514d\u4e86\u6027\u80fd\u5f00\u9500\u3002<\/p>\n<h2>6. \u4f7f\u7528\u53cd\u5c04\u6765\u7834\u574f\u5355\u4f8b\u6a21\u5f0f<\/h2>\n<p>\u53cd\u5c04\u53ef\u4ee5\u7528\u6765\u6467\u6bc1\u6240\u6709\u4ee5\u5f80\u7684\u5355\u4f8b\u5b9e\u73b0\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u7c7b\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span>reflect<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Constructor<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ReflectionSingletonTest<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token class-name\">EagerInitializedSingleton<\/span> instanceOne <span class=\"token operator\">=<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">EagerInitializedSingleton<\/span> instanceTwo <span class=\"token operator\">=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token class-name\">Constructor<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> constructors <span class=\"token operator\">=<\/span> <span class=\"token class-name\">EagerInitializedSingleton<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getDeclaredConstructors<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Constructor<\/span> constructor <span class=\"token operator\">:<\/span> constructors<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n                <span class=\"token comment\">\/\/ This code will destroy the singleton pattern<\/span>\r\n                constructor<span class=\"token punctuation\">.<\/span><span class=\"token function\">setAccessible<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n                instanceTwo <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">EagerInitializedSingleton<\/span><span class=\"token punctuation\">)<\/span> constructor<span class=\"token punctuation\">.<\/span><span class=\"token function\">newInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>instanceOne<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>instanceTwo<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5f53\u4f60\u8fd0\u884c\u4e0a\u8ff0\u6d4b\u8bd5\u7c7b\u65f6\uff0c\u4f60\u4f1a\u6ce8\u610f\u5230\u4e24\u4e2a\u5b9e\u4f8b\u7684\u54c8\u5e0c\u7801\u4e0d\u76f8\u540c\uff0c\u8fd9\u7834\u574f\u4e86\u5355\u4f8b\u6a21\u5f0f\u3002\u53cd\u5c04\u975e\u5e38\u5f3a\u5927\uff0c\u5e76\u4e14\u5728\u5f88\u591a\u6846\u67b6\uff08\u5982Spring\u548cHibernate\uff09\u4e2d\u88ab\u5e7f\u6cdb\u4f7f\u7528\u3002\u901a\u8fc7Java\u53cd\u5c04\u6559\u7a0b\u7ee7\u7eed\u5b66\u4e60\u3002<\/p>\n<h2>7. \u679a\u4e3e\u5355\u4f8b<br \/>\n\u4e3a\u4e86\u89e3\u51b3\u53cd\u5c04\u53ef\u80fd\u5bfc\u81f4\u7684\u5355\u4f8b\u7834\u574f\u95ee\u9898\uff0cJoshua Bloch \u5efa\u8bae\u4f7f\u7528\u679a\u4e3e\uff08Enum\uff09\u6765\u5b9e\u73b0\u5355\u4f8b\u8bbe\u8ba1\u6a21\u5f0f\u3002\u8fd9\u662f\u56e0\u4e3a Java \u8bed\u8a00\u672c\u8eab\u786e\u4fdd\u4e86\u5728\u4efb\u4f55 Java \u7a0b\u5e8f\u4e2d\uff0c\u679a\u4e3e\u503c\u90fd\u53ea\u4f1a\u88ab\u5b9e\u4f8b\u5316\u4e00\u6b21\u3002\u7531\u4e8e Java \u679a\u4e3e\u503c\u662f\u5168\u5c40\u53ef\u8bbf\u95ee\u7684\uff0c\u56e0\u6b64\u57fa\u4e8e\u679a\u4e3e\u5b9e\u73b0\u7684\u5355\u4f8b\u6a21\u5f0f\u4e5f\u5177\u6709\u5168\u5c40\u53ef\u8bbf\u95ee\u6027\u3002\u7136\u800c\uff0c\u8fd9\u79cd\u65b9\u6cd5\u7684\u4e00\u4e2a\u7f3a\u70b9\u662f\u679a\u4e3e\u7c7b\u578b\u5728\u67d0\u4e9b\u65b9\u9762\u4e0d\u591f\u7075\u6d3b\uff0c\u4f8b\u5982\uff0c\u5b83\u4e0d\u652f\u6301\u5ef6\u8fdf\u521d\u59cb\u5316\uff08Lazy Initialization\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code class=\"language-java\"><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">EnumSingleton<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token constant\">INSTANCE<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">doSomething<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token comment\">\/\/ \u6267\u884c\u4e00\u4e9b\u64cd\u4f5c<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<h2>8. \u5e8f\u5217\u5316\u4e0e\u5355\u4f8b\u6a21\u5f0f<\/h2>\n<p>\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u6709\u65f6\u5019\u6211\u4eec\u9700\u8981\u5728\u5355\u4f8b\u7c7b\u4e2d\u5b9e\u73b0Serializable\u63a5\u53e3\uff0c\u4ee5\u4fbf\u5c06\u5176\u72b6\u6001\u5b58\u50a8\u5728\u6587\u4ef6\u7cfb\u7edf\u4e2d\uff0c\u5e76\u5728\u4ee5\u540e\u7684\u65f6\u95f4\u70b9\u4e0a\u68c0\u7d22\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u5b9e\u73b0\u4e86Serializable\u63a5\u53e3\u7684\u5c0f\u578b\u5355\u4f8b\u7c7b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Serializable<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SerializedSingleton<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Serializable<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">long<\/span> serialVersionUID <span class=\"token operator\">=<\/span> <span class=\"token operator\">-<\/span><span class=\"token number\">7604766932017737115L<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">SerializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SingletonHelper<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">SerializedSingleton<\/span> instance <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">SerializedSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">SerializedSingleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">SingletonHelper<\/span><span class=\"token punctuation\">.<\/span>instance<span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5e8f\u5217\u5316\u5355\u4f8b\u7c7b\u7684\u95ee\u9898\u5728\u4e8e\uff0c\u6bcf\u5f53\u6211\u4eec\u5bf9\u5176\u8fdb\u884c\u53cd\u5e8f\u5217\u5316\u65f6\uff0c\u5b83\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u7c7b\u5b9e\u4f8b\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">package<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>scdev<span class=\"token punctuation\">.<\/span>singleton<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">FileInputStream<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">FileNotFoundException<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">FileOutputStream<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IOException<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ObjectInput<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ObjectInputStream<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ObjectOutput<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ObjectOutputStream<\/span><\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SingletonSerializedTest<\/span> <span class=\"token punctuation\">{<\/span>\r\n\r\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">FileNotFoundException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ClassNotFoundException<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token class-name\">SerializedSingleton<\/span> instanceOne <span class=\"token operator\">=<\/span> <span class=\"token class-name\">SerializedSingleton<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">ObjectOutput<\/span> out <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ObjectOutputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FileOutputStream<\/span><span class=\"token punctuation\">(<\/span>\r\n                <span class=\"token string\">\"filename.ser\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        out<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeObject<\/span><span class=\"token punctuation\">(<\/span>instanceOne<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        out<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n        <span class=\"token comment\">\/\/ deserialize from file to object<\/span>\r\n        <span class=\"token class-name\">ObjectInput<\/span> in <span class=\"token operator\">=<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ObjectInputStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">FileInputStream<\/span><span class=\"token punctuation\">(<\/span>\r\n                <span class=\"token string\">\"filename.ser\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">SerializedSingleton<\/span> instanceTwo <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">SerializedSingleton<\/span><span class=\"token punctuation\">)<\/span> in<span class=\"token punctuation\">.<\/span><span class=\"token function\">readObject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        in<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"instanceOne hashCode=\"<\/span><span class=\"token operator\">+<\/span>instanceOne<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"instanceTwo hashCode=\"<\/span><span class=\"token operator\">+<\/span>instanceTwo<span class=\"token punctuation\">.<\/span><span class=\"token function\">hashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n    <span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u90a3\u6bb5\u4ee3\u7801\u4f1a\u4ea7\u751f\u8fd9\u4e2a\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">Output<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>instanceOne \u7684\u54c8\u5e0c\u7801\u4e3a 2011117821\uff0cinstanceTwo \u7684\u54c8\u5e0c\u7801\u4e3a 109647522\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u56e0\u6b64\uff0c\u8fd9\u7834\u574f\u4e86\u5355\u4f8b\u6a21\u5f0f\u7684\u552f\u4e00\u6027\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53ea\u9700\u8981\u63d0\u4f9b <code>readResolve()<\/code> \u65b9\u6cd5\u7684\u5b9e\u73b0\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">readResolve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u6b64\u4e4b\u540e\uff0c\u60a8\u4f1a\u6ce8\u610f\u5230\u6d4b\u8bd5\u7a0b\u5e8f\u4e2d\u4e24\u4e2a\u5b9e\u4f8b\u7684\u54c8\u5e0c\u7801\u662f\u76f8\u540c\u7684\uff0c\u4ece\u800c\u786e\u4fdd\u4e86\u5355\u4f8b\u7684\u552f\u4e00\u6027\u3002<\/p>\n<p>\u5efa\u8bae\u9605\u8bfb\u66f4\u591a\u5173\u4e8e <a href=\"#\" target=\"_blank\" rel=\"noopener\">Java \u5e8f\u5217\u5316<\/a> \u548c <a href=\"#\" target=\"_blank\" rel=\"noopener\">Java \u53cd\u5e8f\u5217\u5316<\/a> \u7684\u5185\u5bb9\u3002<\/p>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u4e86 Java \u5355\u4f8b\u8bbe\u8ba1\u6a21\u5f0f\u7684\u6700\u4f73\u5b9e\u8df5\u548c\u793a\u4f8b\u3002<\/p>\n<p>\u5982\u9700\u7ee7\u7eed\u5b66\u4e60\uff0c\u8bf7\u53c2\u8003\u66f4\u591a <a href=\"#\" target=\"_blank\" rel=\"noopener\">Java \u6559\u7a0b<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f15\u8a00 Java\u5355\u4f8b\u6a21\u5f0f\u662f\u201c\u56db\u4eba\u5e2e\u201d\uff08Gang of Four, GoF\uff09\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u4e00\uff0c\u5c5e\u4e8e\u521b\u5efa\u578b\u8bbe\u8ba1\u6a21\u5f0f\u3002\u4ece\u5b9a [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[189,865,863,864,720],"class_list":["post-226","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java","tag-865","tag-863","tag-864","tag-720"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium 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