Java第六次实验

抽奖程序：

import java.util.ArrayList;
import java.util.Iterator;
import java.util.Random;
import java.util.Scanner;

public class DrawPrize {
    private ArrayList<Integer> prize;
    private Random rand;
    private Scanner sc;

    public DrawPrize() {
        prize = new ArrayList<>();
        rand = new Random();
        sc = new Scanner(System.in);
    }

    public void addToSet() {
        System.out.println("总奖品数目为：");
        int total = sc.nextInt();
        while (prize.size() < total) {
            prize.add(rand.nextInt(1000));
        }
    }

    public void drawPrize() {
        System.out.println("一、二、三等奖的个数分别为：");
        int dp1 = sc.nextInt();
        int dp2 = sc.nextInt();
        int dp3 = sc.nextInt();
        Iterator iterator = prize.iterator();
        int i = 0;
        System.out.println("获得一等奖的是：");
        while (i < dp1) {
            System.out.println("          " + iterator.next());
            iterator.remove();
            i++;
        }
        i = 0;
        System.out.println("获得二等奖的是：");
        while (i < dp2) {
            System.out.println("          " + iterator.next());
            iterator.remove();
            i++;
        }
        i = 0;
        System.out.println("获得三等奖的是：");
        while (i < dp3) {
            System.out.println("          " + iterator.next());
            iterator.remove();
            i++;
        }
    }

    public static void main(String[] args) {
        DrawPrize prizeLearning = new DrawPrize();
        prizeLearning.addToSet();
        prizeLearning.drawPrize();
    }
}

结果如下：