设计模式-单例模式

使用ThreadLocal类 线程范围内共享变量。

package com.lyc.thinkinjava;

public class Singleton {
	
	private static ThreadLocal<Singleton> map = new ThreadLocal<Singleton>();
	private Singleton() {}
	public static Singleton getInstance() {
		Singleton instance = map.get();
		if (instance == null) {
			instance = new Singleton();
			map.set(instance);
		}
		return instance;
	}

}