{"id":38480,"date":"2023-12-11T14:44:35","date_gmt":"2023-12-11T06:44:35","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=38480"},"modified":"2023-12-11T14:44:35","modified_gmt":"2023-12-11T06:44:35","slug":"%e8%af%b7%e4%bd%a0%e6%89%8b%e5%86%99%e4%b8%80%e4%b8%8b%e5%8d%95%e4%be%8b%e6%a8%a1%e5%bc%8f%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/%e8%af%b7%e4%bd%a0%e6%89%8b%e5%86%99%e4%b8%80%e4%b8%8b%e5%8d%95%e4%be%8b%e6%a8%a1%e5%bc%8f%ef%bc%9f\/","title":{"rendered":"\u8bf7\u4f60\u624b\u5199\u4e00\u4e0b\u5355\u4f8b\u6a21\u5f0f\uff1f"},"content":{"rendered":"

“`” \u53c2\u8003\u56de\u7b54\uff1a<\/p>\n

1\u3001\u997f\u6c49\u6a21\u5f0f<\/p>\n

<pre><code class=""language-java"" lang=""java"">public class Singleton {
\n private static Singleton instance = new Singleton();
\n private Singleton (){
\n }
\n public static Singleton getInstance() {
\n return instance;
\n }
\n}
\n<\/code><\/pre><\/p>\n

\u8fd9\u79cd\u65b9\u5f0f\u5728\u7c7b\u52a0\u8f7d\u65f6\u5c31\u5b8c\u6210\u4e86\u521d\u59cb\u5316\uff0c\u6240\u4ee5\u7c7b\u52a0\u8f7d\u8f83\u6162\uff0c\u4f46\u83b7\u53d6\u5bf9\u8c61\u7684\u901f\u5ea6\u5feb\u3002\u8fd9\u79cd\u65b9\u5f0f\u57fa\u4e8e\u7c7b\u52a0\u8f7d\u673a\u5236\u907f\u514d\u4e86\u591a\u7ebf\u7a0b\u7684\u540c\u6b65\u95ee\u9898\uff0c\u4f46\u662f\u4e5f\u4e0d\u80fd\u786e\u5b9a\u6709\u5176\u4ed6\u7684\u65b9\u5f0f\uff08\u6216\u8005\u5176\u4ed6\u7684\u9759\u6001\u65b9\u6cd5\uff09\u5bfc\u81f4\u7c7b\u88c5\u8f7d\uff0c\u8fd9\u65f6\u5019\u521d\u59cb\u5316instance\u663e\u7136\u6ca1\u6709\u8fbe\u5230\u61d2\u52a0\u8f7d\u7684\u6548\u679c\u3002<\/p>\n

2\u3001\u61d2\u6c49\u6a21\u5f0f\uff08\u7ebf\u7a0b\u4e0d\u5b89\u5168\uff09<\/p>\n

<pre><code class=""language-java"" lang=""java"">public class Singleton {
\n private static Singleton instance;
\n private Singleton (){
\n }
\n public static Singleton getInstance() {
\n if (instance == null) {
\n instance = new Singleton();
\n }
\n return instance;
\n }
\n}
\n<\/code><\/pre><\/p>\n

\u61d2\u6c49\u6a21\u5f0f\u7533\u660e\u4e86\u4e00\u4e2a\u9759\u6001\u5bf9\u8c61\uff0c\u5728\u7528\u6237\u7b2c\u4e00\u6b21\u8c03\u7528\u65f6\u521d\u59cb\u5316\uff0c\u867d\u7136\u8282\u7ea6\u4e86\u8d44\u6e90\uff0c\u4f46\u7b2c\u4e00\u6b21\u52a0\u8f7d\u65f6\u9700\u8981\u5b9e\u4f8b\u5316\uff0c\u53cd\u6620\u7a0d\u6162\u4e00\u4e9b\uff0c\u800c\u4e14\u5728\u591a\u7ebf\u7a0b\u4e0d\u80fd\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n

3\u3001\u61d2\u6c49\u6a21\u5f0f\uff08\u7ebf\u7a0b\u5b89\u5168\uff09<\/p>\n

<pre><code class=""language-java"" lang=""java"">public class Singleton {
\n private static Singleton instance;
\n private Singleton (){
\n }
\n public static synchronized Singleton getInstance() {
\n if (instance == null) {
\n instance = new Singleton();
\n }
\n return instance;
\n }
\n}
\n<\/code><\/pre><\/p>\n

\u8fd9\u79cd\u5199\u6cd5\u80fd\u591f\u5728\u591a\u7ebf\u7a0b\u4e2d\u5f88\u597d\u7684\u5de5\u4f5c\uff0c\u4f46\u662f\u6bcf\u6b21\u8c03\u7528getInstance\u65b9\u6cd5\u65f6\u90fd\u9700\u8981\u8fdb\u884c\u540c\u6b65\uff0c\u9020\u6210\u4e0d\u5fc5\u8981\u7684\u540c\u6b65\u5f00\u9500\uff0c\u800c\u4e14\u5927\u90e8\u5206\u65f6\u5019\u6211\u4eec\u662f\u7528\u4e0d\u5230\u540c\u6b65\u7684\uff0c\u6240\u4ee5\u4e0d\u5efa\u8bae\u7528\u8fd9\u79cd\u6a21\u5f0f\u3002<\/p>\n

4\u3001\u53cc\u91cd\u68c0\u67e5\u6a21\u5f0f \uff08DCL\uff09<\/p>\n

<pre><code class=""language-java"" lang=""java"">public class Singleton {
\n private volatile static Singleton singleton;
\n private Singleton (){
\n }
\n public static Singleton getInstance() {
\n if (instance== null) {
\n synchronized (Singleton.class) {
\n if (instance== null) {
\n instance= new Singleton();
\n }
\n }
\n }
\n return singleton;
\n }
\n}
\n<\/code><\/pre><\/p>\n

\u8fd9\u79cd\u5199\u6cd5\u5728getSingleton\u65b9\u6cd5\u4e2d\u5bf9singleton\u8fdb\u884c\u4e86\u4e24\u6b21\u5224\u7a7a\uff0c\u7b2c\u4e00\u6b21\u662f\u4e3a\u4e86\u4e0d\u5fc5\u8981\u7684\u540c\u6b65\uff0c\u7b2c\u4e8c\u6b21\u662f\u5728singleton\u7b49\u4e8enull\u7684\u60c5\u51b5\u4e0b\u624d\u521b\u5efa\u5b9e\u4f8b\u3002<\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>\n

<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"

“`” \u53c2\u8003\u56de\u7b54\uff1a 1\u3001\u997f\u6c49\u6a21\u5f0f <pre><code class= […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-38480","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/38480","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=38480"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/38480\/revisions"}],"predecessor-version":[{"id":38481,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/38480\/revisions\/38481"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=38480"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=38480"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=38480"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}