{"id":589,"date":"2017-02-27T09:27:49","date_gmt":"2017-02-27T01:27:49","guid":{"rendered":"http:\/\/www.rainweb.site\/?p=589"},"modified":"2023-08-07T20:57:28","modified_gmt":"2023-08-07T12:57:28","slug":"java-article63","status":"publish","type":"post","link":"http:\/\/rain1024.com\/index.php\/2017\/02\/27\/java-article63\/","title":{"rendered":"Java\u7ebf\u7a0b\u540c\u6b65\u4e4b\u540c\u6b65\u9501"},"content":{"rendered":"<p>\u540c\u6b65\u9501Lock\u662f\u4e00\u79cd\u66f4\u5f3a\u5927\u7684\u7ebf\u7a0b\u540c\u6b65\u673a\u5236\uff0c\u901a\u8fc7\u663e\u5f0f\u5b9a\u4e49\u540c\u6b65\u9501\u5bf9\u8c61\u6765\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65\u3002\u540c\u6b65\u9501\u63d0\u4f9b\u4e86\u6bd4\u540c\u6b65\u4ee3\u7801\u5757\uff0c\u540c\u6b65\u65b9\u6cd5\u66f4\u5e7f\u6cdb\u7684\u9501\u5b9a\u64cd\u4f5c\uff0c\u5b9e\u73b0\u66f4\u7075\u6d3b<\/p>\n<p>Lock\u662f\u63a7\u5236\u591a\u4e2a\u7ebf\u7a0b\u5bf9\u5171\u4eab\u8d44\u6e90\u8fdb\u884c\u8bbf\u95ee\u7684\u5de5\u5177\uff0c\u80fd\u591f\u5bf9\u5171\u4eab\u8d44\u6e90\u8fdb\u884c\u72ec\u5360\u8bbf\u95ee\uff0c\u6bcf\u6b21\u53ea\u80fd\u6709\u4e00\u4e2a\u7ebf\u7a0b\u5bf9Lock\u5bf9\u8c61\u52a0\u9501\uff0c\u7ebf\u7a0b\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u4e4b\u524d\u9700\u8981\u5148\u83b7\u5f97Lock\u5bf9\u8c61\uff0c\u67d0\u4e9b\u9501\u53ef\u80fd\u5141\u8bb8\u5bf9\u5171\u4eab\u8d44\u6e90\u5e76\u53d1\u8bbf\u95ee\u3002<\/p>\n<p>\u3010\u793a\u4f8b\u3011\u4f7f\u7528ReentrantLock\u9501<\/p>\n<pre><code class=\"java\">class MyClass{\n    \/\/1.\u5b9a\u4e49\u9501\u5bf9\u8c61\n    private final ReentrantLock lock = new ReentrantLock();\n    \/\/\u5b9a\u4e49\u9700\u8981\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u6cd5\n    public void myMethod(){\n        \/\/2.\u52a0\u9501\n        lock.lock();\n        try {\n            \/\/\u9700\u8981\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u7684\u4ee3\u7801\n        }finally {\n            \/\/3.\u91ca\u653e\u9501\n            lock.unlock();\n        }\n    }\n}\n<\/code><\/pre>\n<ul>\n<li>\u52a0\u9501\u548c\u91ca\u653e\u9501\u9700\u8981\u653e\u5728\u7ebf\u7a0b\u5b89\u5168\u7684\u65b9\u6cd5\u4e2d\uff1b<\/li>\n<li>lock.unlock()\u653e\u5728finally\u8bed\u53e5\u4e2d\uff0c\u4e0d\u7ba1\u53d1\u751f\u5f02\u5e38\u4e0e\u5426\uff0c\u90fd\u9700\u8981\u91ca\u653e\u9501<\/li>\n<\/ul>\n<h3>\u4e0b\u9762\u5728\u94f6\u884c\u8d26\u6237\u7c7b\u4e2d\u589e\u52a0\u4e00\u4e2a\u540c\u6b65\u9501<\/h3>\n<p>BankAccount.java<\/p>\n<pre><code>package com.rain.demo;\nimport java.util.concurrent.locks.ReentrantLock;\n\/**\n * Created by w-pc on 2017\/02\/24.\n *\n * \u6a21\u62df\u94f6\u884c\u8d26\u6237\n * *\/\npublic class BankAccount {\n    \/\/\u94f6\u884c\u8d26\u6237\n    private String bankNo;\n    \/\/\u94f6\u884c\u4f59\u989d\n    private double balance;\n    \/\/\u5b9a\u4e49\u9501\u5bf9\u8c61\n    private final ReentrantLock lock = new ReentrantLock();\n    \/\/\u6784\u9020\u65b9\u6cd5\n    public BankAccount(String bankNo,double balance) {\n        this.bankNo = bankNo;\n        this.balance = balance;\n    }\n    public void setBankNo(String bankNo) {\n        this.bankNo = bankNo;\n    }\n    public void setBalance(double balance) {\n        this.balance = balance;\n    }\n    public double getBalance() {\n        return balance;\n    }\n    public String getBankNo() {\n        return bankNo;\n    }\n    public void access(double money){\n        \/\/\u52a0\u9501\n        lock.lock();\n        try {\n            if (money &lt; 0 &amp;&amp; balance - money &lt; 0) {\n                System.out.println(Thread.currentThread().getName()+\"\u64cd\u4f5c\u5931\u8d25\");\n                return;\n            } else {\n                balance += money;\n                System.out.println(Thread.currentThread().getName()+\"\u64cd\u4f5c\u6210\u529f\uff0c\u5f53\u524d\u4f59\u989d\uff1a\" + balance);\n                \/\/\u8bbe\u5b9a\u4f11\u7720\u4e00\u6beb\u79d2\uff0c\u4f7f\u5176\u4ed6\u7ebf\u7a0b\u5f97\u4ee5\u6267\u884c\n                try {\n                    Thread.sleep(1);\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                }\n\n            }\n        }finally {\n            lock.unlock();\n        }\n\n    }\n}\n<\/code><\/pre>\n<p>\u7ed3\u679c\uff1a<\/p>\n<pre><code>T001\u64cd\u4f5c\u6210\u529f\uff0c\u5f53\u524d\u4f59\u989d\uff1a2000.0\nT002\u64cd\u4f5c\u6210\u529f\uff0c\u5f53\u524d\u4f59\u989d\uff1a-1000.0\nT003\u64cd\u4f5c\u6210\u529f\uff0c\u5f53\u524d\u4f59\u989d\uff1a0.0\nT004\u64cd\u4f5c\u6210\u529f\uff0c\u5f53\u524d\u4f59\u989d\uff1a-2000.0\nT005\u64cd\u4f5c\u6210\u529f\uff0c\u5f53\u524d\u4f59\u989d\uff1a0.0\n\u8d26\u6237\uff1a60001002,\u4f59\u989d\uff1a0.0\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u540c\u6b65\u9501Lock\u662f\u4e00\u79cd\u66f4\u5f3a\u5927\u7684\u7ebf\u7a0b\u540c\u6b65\u673a\u5236\uff0c\u901a\u8fc7\u663e\u5f0f\u5b9a\u4e49\u540c\u6b65\u9501\u5bf9\u8c61\u6765\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65\u3002\u540c\u6b65\u9501\u63d0\u4f9b\u4e86\u6bd4\u540c\u6b65\u4ee3\u7801\u5757\uff0c\u540c\u6b65\u2026 <span class=\"read-more\"><a href=\"http:\/\/rain1024.com\/index.php\/2017\/02\/27\/java-article63\/\">Read More &raquo;<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":472,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"aside","meta":{"footnotes":""},"categories":[31],"tags":[46,84],"class_list":["post-589","post","type-post","status-publish","format-aside","has-post-thumbnail","hentry","category-java","tag-java","tag-thread","post_format-post-format-aside"],"_links":{"self":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/589","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/comments?post=589"}],"version-history":[{"count":1,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/589\/revisions"}],"predecessor-version":[{"id":1475,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/589\/revisions\/1475"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/media\/472"}],"wp:attachment":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/media?parent=589"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/categories?post=589"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/tags?post=589"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}