package com.waibizi.demo06; public class Singleton_pattern { public static void main(String[] args) { // TODO Auto-generated method stub Singleton test = Singleton.getInstance(); Singleton test1 = Singleton.getInstance(); System.out.println(test.hashCode()); System.out.println(test1.hashCode()); } } //静态内部类 @SuppressWarnings("all") class Singleton{ //构造器私有化 private Singleton() { } //写一个静态内部类,该类有一个静态属性 private static class SingletonInstance{ private static final Singleton instance = new Singleton(); } //双重安全检查,解决线程安全问题,解决懒加载问题 //即懒汉式加载(线程安全) public static synchronized Singleton getInstance() { return SingletonInstance.instance; } }
单例设计模式之懒汉式(静态内部类双重检查)
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转载自www.cnblogs.com/waibizi/p/12084080.html
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