Java单例模式简单实现

代码

public class Singleton {private static Singleton singleton;//创建一个单例对象public static Singleton getSingleton(){if(singleton == null){//判断对象是否为空singleton = new Singleton();}return singleton;}
}

public class Test {public static void main(String[] args) {Singleton s1 = Singleton.getSingleton();Singleton s2 = Singleton.getSingleton();System.out.println(s1 == s2);            //输出trueSystem.out.println(s1.equals(s2));        //输出true
    }
}