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饿汉式单例类不能实现延迟加载,不管将来用不用始终占据内存;懒汉式单例类线程安全控制烦琐,而且性能受影响。有种更好的单例模式叫做Initialization Demand Holder (IoDH)的技术。
public class Singleton { private Singleton(){ System.out.println(Singleton.class); } private static class HolderClass{ private final static Singleton s = new Singleton(); } public static Singleton getInstance(){ return HolderClass.s; } public static void main(String[] args) { Singleton s = Singleton.getInstance(); } }
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原文地址:http://www.cnblogs.com/Iqiaoxun/p/5904920.html