發(fā)紅包

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需求：群主發(fā)普通紅包， 某群有多名成員春塌， 群主給成員發(fā)普通紅包晓避，規(guī)則為

1.群主有一筆金額， 從群主的余額中扣除只壳， 平均分成n等分俏拱， 讓成員去領
2.成員領取紅包之后，保存到成員余額中

• 定義user類

package com.neusoft.day09.redbag;

/**
 * @author Eric Lee
 * @date 2020/7/23 10:48
 */
public class User {
    // 用戶名
    private String userName;

    // 余額
    private int leftMoney;

    public User() {
    }

    public User(String userName, int leftMoney) {
        this.userName = userName;
        this.leftMoney = leftMoney;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public int getLeftMoney() {
        return leftMoney;
    }

    public void setLeftMoney(int leftMoney) {
        this.leftMoney = leftMoney;
    }

    public void show(){
        System.out.println("用戶" + userName + "\t"+"余額為" + leftMoney + "元" );
    }
}

• 群主類

package com.neusoft.day09.redbag;

import java.util.ArrayList;

/**
 * @author Eric Lee
 * @date 2020/7/23 10:52
 */
public class Manager extends User {
    public Manager() {
    }

    public Manager(String userName, int leftMoney) {
        super(userName, leftMoney);
    }

    // 發(fā)紅包
    public ArrayList<Integer> send(int totalMoney, int count){

        ArrayList<Integer> redList = new ArrayList<>();

        int leftMoney = super.getLeftMoney();
        // 判斷
        if(totalMoney > leftMoney){
            System.out.println("余額不足");
        }
        // 扣錢
        super.setLeftMoney(leftMoney-totalMoney);
        // 每個人發(fā)的錢
        int avg = totalMoney/count;
        // 除不開余出來的錢
        int mod = totalMoney%count;

        for (int i = 0; i <count-1 ; i++) {
            redList.add(avg);
        }
        int last = avg+mod;
        redList.add(last);
        return redList;
    }

}

• 成員類

package com.neusoft.day09.redbag;

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

/**
 * @author Eric Lee
 * @date 2020/7/23 10:54
 */
public class Member extends User {
    public Member() {
    }

    public Member(String userName, int leftMoney) {
        super(userName, leftMoney);
    }
    //收紅包
    public void receive( ArrayList<Integer> list){

        Random random = new Random();
        int index = random.nextInt(list.size());
//        Integer money = list.get(index);
        // 收完之后刪除
        Integer removeMoney = list.remove(index);
        // 更新余額
        int leftMoney = super.getLeftMoney();
        int updateMoney = leftMoney +removeMoney;
        super.setLeftMoney(updateMoney);


    }
}

• 測試類

package com.neusoft.day09.redbag;

import java.util.ArrayList;
import java.util.Scanner;

/**
 * @author Eric Lee
 * @date 2020/7/23 10:54
 */
public class Test {
    public static void main(String[] args) {
        Manager manager = new Manager("群主", 200);
        Member one = new Member("成員A", 0);
        Member two = new Member("成員B", 0);
        Member three = new Member("成員C", 0);
        manager.show();
        one.show();
        two.show();
        three.show();
        Scanner scanner = new Scanner(System.in);
        System.out.println("請輸入金額");
        int money = scanner.nextInt();
        System.out.println("請輸入發(fā)幾個包");
        int count = scanner.nextInt();
        // 調用發(fā)紅包
        ArrayList<Integer> redList = manager.send(money, count);
        // 調用收紅包
        one.receive(redList);
        two.receive(redList);
        three.receive(redList);

        manager.show();
        one.show();
        two.show();
        three.show();


    }
}