期中抽奖系统

import java.util.ArrayList;
import java.util.Collections;
import java.util.Random;
public class Game {

ArrayList jiangquans;

public static void main(String[] args) {

// TODO Auto-generated method stub

Game g = new Game();

g.deal();

System.out.println("一等奖获得者：");

g.sj(1);

System.out.println("奖品是iPhone6s一部\n");

System.out.println("二等奖获得者：");

g.sj(2);

System.out.println("送奖金1000元\n");

System.out.println("三等奖获得者：");

g.sj(10);

System.out.println("手机话费100元");

}

private void sj(int i) {
// TODO Auto-generated method stub

}

public void deal(){

if(jiangquans == null){

jiangquans = new ArrayList();

for(int i=1;i<=2000;i++){

jiangquans.add(i);

}

}

Collections.shuffle(jiangquans);}

public void sj1(int n){

Random ran1 = new Random(2000);

for (int i = 0; i < n; i++) {

int index = ran1.nextInt(jiangquans.size());

System.out.print(jiangquans.get(index)+"\t");

jiangquans.remove(index);

}

}

}

程序运行截图如下