单例模式（java）

public class Singlton {
    private  static Singlton instance;
    private Singlton(){}
    public static Singlton getInstance(){
        if(instance==null){
            instance=new Singlton();
        }
        return instance;
    }
    public static class SingletonTest{
        public static void main(String[] args) {
            Singlton singlton1=Singlton.getInstance();
            Singlton singlton2=Singlton.getInstance();
            System.out.println(singlton1==singlton2);
        }
    }
}
    
}

因为通过getInstanse（）方法控制了该类只能产生一个实例，所以最后的结果返回为true