java第6次作业

import java.util.ArrayList;

import java.util.Collections;

import java.util.Random;

import java.util.*;

public class choujiang {

    private ArrayList<Integer> cards;

    public void deal(int num){

        if (cards==null){

            cards=new ArrayList<Integer>();

            for(num=1;num<=100;num++){

                cards.add(num);

            }

        }

        Collections.shuffle(cards);

    }

    public void draw(){

       Random ra=new Random();

        int s =ra.nextInt(cards.size());

        System.out.println("一等奖:"+ cards.get(s));

        cards.remove(cards.get(s));

        Collections.shuffle(cards);

        for(int i=0;i<2;i++){

            int stwo=ra.nextInt(cards.size());

            System.out.println("二等奖:"+ cards.get(stwo));

            cards.remove(cards.get(stwo));

            }

        Collections.shuffle(cards);

            for(int j =0;j<3;j++){

                int sthree =ra.nextInt(cards.size());

                System.out.println("三等奖:"+cards.get(sthree));

                cards.remove(cards.get(sthree));

            }

         }

    public static void main(String[] args) {

        // TODO Auto-generated method stub

        choujiang c = new choujiang();

        c.deal(0);

        c.draw();

    }

}