单例模式应用

Emperor类中的代码：

package org.hanqi.pn0120;

public class Emperor {
    private static Emperor emperor=null;
    private Emperor()
    {
        
    }
    public static Emperor getInstance()
    {
        if(emperor==null)
        {
            emperor=new Emperor();
        }
        return emperor;
    }
    public void getName()
    {
        System.out.println("我是皇帝：太上皇");
    }
}

Test类的代码：

package org.hanqi.pn0120;

public class Testemperor {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("创建皇帝1对象：");
        Emperor emperor1=Emperor.getInstance();
        emperor1.getName();
        System.out.println("创建皇帝2对象：");
        Emperor emperor2=Emperor.getInstance();
        emperor2.getName();
        System.out.println("创建皇帝3对象：");
        Emperor emperor3=Emperor.getInstance();
        emperor3.getName();
        

    }

}