My first Singleton

这是我我自己写的第一个单例模式的程序

class Singleton{

 private static Singleton instance;

private Singleton(){}

public static Singleton getInstance(){

if(null==instance){

instance=new Singleton();

}

}

}

下面是测试程序

public class TestSingleton{

public static void main(String args[]){

Singleton s1=Singleton.getInstance();

Singleton s2=Singleton.getInstance();

System.out.println(s1==s2);

}

}

输出结果为：true