Java 多線程下，2種安全、性能靠譜的單例模式

懶漢式-雙重覈驗：java package com.zzf.concurrence.singleinstance; /** * 懶漢式-雙重覈驗 * @author zzf * */ public class SingleEHan { private SingleEHan() {} private static volatile SingleEHan instance=nu

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