期中抽奖系统

import java.util.ArrayList; import java.util.Collections; import java.util.Random;

public class Game {

    ArrayList<Integer> 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("送汽车一辆 ");

        System.out.println("二等奖获得者：");

        g.sj(2);

        System.out.println("送奖金1000元 ");

        System.out.println("三等奖获得者：");

        g.sj(10);

        System.out.println("送油一桶");

         }

    public void deal(){

     if(jiangquans == null){

      jiangquans = new ArrayList<Integer>();

      for(int i=1;i<=2000;i++){

       jiangquans.add(i);

      }

     }

     Collections.shuffle(jiangquans);

    }

    public void sj(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)+" ");

            jiangquans.remove(index);

                   }

    }

}