java第6次作业

题目：做一个抽奖程序，要求可以设定参与抽奖的总人数和奖项的个数，获奖不可重复。

 

代码如下：

思路备注在代码中，获奖不可重复，这句代码：people.remove(peopleindex); 并在list不为空的情况下递归。

代码中，提示输出写错了，想表达的是奖品的种类，不是个数。。。。   

package com.cumin;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

public class LuckDraw {
    List<Map<String, String>> list = new ArrayList<>();
    Map<String, String> map = new HashMap<>();
    public List<Map<String, String>> LuckDrawing(List<Prize> prizes, List<People> people) {

        Random rm = new Random();
        // people List随机的人
        int peopleindex = rm.nextInt(People.numofpeople);
        // prizes List随机的奖品
        int prizesindex = rm.nextInt(Prize.numofprizes);
        // 奖品与抽奖人建立Map
        
        map.put(people.get(peopleindex).getName(), prizes.get(prizesindex).getName());
        list.add(map);

        // 不可重复抽奖，从people删除该人
        people.remove(peopleindex);
        //总人数--
        People.numofpeople--;
        if (!people.isEmpty()) {
            return LuckDrawing(prizes, people);
        } else
            return list;

    }

}

 

package com.cumin;

public class People {
    public static int numofpeople;
    private String name;
    static int count = 0;

    public People(String name) {
        count++;
        //判断人数
        if (count > numofpeople) {
            System.out.println("参与抽奖的人数已满，请下次再来！");
        }
        this.name = name;
    }

    public static int getNumofpeople() {
        return numofpeople;
    }

    public void setNumofpeople(int numofpeople) {
        this.numofpeople = numofpeople;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

package com.cumin;

public class Prize {

    // 奖品的数量
    public static int numofprizes;
    private String name;

    static int count = 0;

    public Prize(String name) {
        count++;
        //判断奖品数量
        if (count > numofprizes) {
            System.out.println("奖品数量已达到最大，无需设置");
        }
        this.name=name;
    }


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public static int getNumofprizes() {
        return numofprizes;
    }

    public void setNumofprizes(int numofprizes) {
        this.numofprizes = numofprizes;
    }

}

测试类如下：

　

package com.cumin;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;

public class Test {
    public static void main(String args[]) {
        System.out.println("请设置抽奖的人数：");
        Scanner input = new Scanner(System.in);
        People.numofpeople = input.nextInt();

        System.out.println("请设置奖品的数量：");
        Prize.numofprizes = input.nextInt();

        List<People> people = new ArrayList<>();
        People people1 = new People("小明");
        People people2 = new People("小红");
        People people3 = new People("小美");
        people.add(people1);
        people.add(people2);
        people.add(people3);

        List<Prize> prizes = new ArrayList<>();
        Prize prize1 = new Prize("书");
        Prize prize2 = new Prize("橡皮");
        prizes.add(prize1);
        prizes.add(prize2);
        LuckDraw luckdraw = new LuckDraw();
        List<Map<String, String>> list = luckdraw.LuckDrawing(prizes, people);
        for(int i=0;i<list.size();i++) {
            Map<String, String> map  =list.get(i);
            Set<String> set = map.keySet();
            Iterator<String> its = set.iterator();
            while (its.hasNext()) {
                // key
                String key = its.next();
                // value
                String value =  map.get(key);
                System.out.println(key +" "+ value);
                list.remove(i);
            }
        }
        

    }
}

附图如下：

如果在多出人数和奖品，会提示，附图如下：