//CopyRight CAnca Software Office. 2006
//Created by CAnca.

import java.util.*;

public class singletonMode{
 public static void main(String[] args){
  singleton s1 = singleton.init();
  System.out.println(s1.getElement(0));
  System.out.println(s1.getElement(1));
  
  s1.setElement(0,"日本人");
  
  singleton s2 = singleton.init();
  System.out.println(s2.getElement(0));
  System.out.println(s2.getElement(1));
 }
}

class singleton{
 private ArrayList al;
 private static singleton single;
 protected singleton(){
  al = new ArrayList();
  al.add("中国人");
  al.add("美国人");
 }
 
 public static singleton init(){
  if(single == null){
   single = new singleton();
  }
  return single;
 }
 
 public String getElement(int id){
  if(id >= al.size()) - 1;
  return ((String)al.get(id));
 }
 
 public void setElement(int id,String value){
  if(id >= al.size()) - 1;
  this.al.set(id,value);
 }
}