23种设模式

//饿汉式

class Single {
	//私有构造函数
	private Single() {}
	private static Single s = new Single();
	public Single getInstance() {
		return s;
	}
}

//懒汉式

//懒汉式
class Singll{
	private Singll(){}
	private static Singll s;
	public static Singll getInstance(){
		if(s == null){
			s = new Singll();
		}
		return s;
	}
}