只保留一个对象空间——静态方法调用私有构造方法

import java.util.*;
public class myTest {


/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Emperor emperor1=Emperor.getInstance();
//new Emperor1();
emperor1.setName("zs1111");

Emperor emperor2=Emperor.getInstance();
//new Emperor1();
emperor2.setName("zs2222");
emperor1.setName("zs22222211");
 
emperor1.getName();
emperor2.getName();


}


}




class Emperor{
private static Emperor emperor=null;
//private static Emperor emperor=new Emperor();
private String name;
private Emperor(){
//emperor=new Emperor();
//emperor.str="zsz zszs";
}
public static Emperor getInstance(){
if(emperor==null){
emperor=new Emperor();
}
return emperor;
}
public void getName(){
System.out.println("name:"+name);
}
public void setName(String name){
this.name=name;
}
}