单例模式之Java

package com.sc.test;

public class SingletonMain {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("Start");
        Singleton obj1 = Singleton.getInstance();
        Singleton obj2 = Singleton.getInstance();
        if(obj1 == obj2){
            System.out.println("obj1和obj2是同一个对象实例");
        }else{
            System.out.println("obj1和obj2并非同一对象实例");
        }
        System.out.println("end");
    }

}

 

package com.sc.test;

public class Singleton {
    private static Singleton singleton = new Singleton();
    private Singleton(){
        System.out.println("已产生实例对象");
    }
    public static Singleton getInstance(){
        return singleton;
    }
}