发红包的案例

package cn.hope.day09.demo09;

/**
 * @author newcityman
 * @date 2019/7/11 - 22:57
 */
public class User {
    private String name;
    private Integer money;

    public User() {
    }

    public User(String name, Integer money) {
        this.name = name;
        this.money = money;
    }

    public String getName() {
        return name;
    }

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

    public Integer getMoney() {
        return money;
    }

    public void setMoney(Integer money) {
        this.money = money;
    }

    public  void show(){
        System.out.println("我是："+this.name+",我的余额是："+this.money);
    }
}

package cn.hope.day09.demo09;

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

/**
 * @author newcityman
 * @date 2019/7/11 - 23:24
 */
public class Member extends  User {
    public Member() {
    }

    public Member(String name, Integer money) {
        super(name, money);
    }

    public void receive(ArrayList<Integer> list){
        //从红包中随机抽取一个，给自己
        //随机抽取一个集合中的索引编号
        int index= new Random().nextInt(list.size());
        //根据索引，从集合中删除，并且得到被删除的红包，给自己
        int  delta = list.remove(index);
        //当前成员目前本来有多少钱
        int money = super.getMoney();
        //收取红包，存进腰包
        super.setMoney(money+delta);

    }
}

package cn.hope.day09.demo09;

import java.util.ArrayList;

/**
 * @author newcityman
 * @date 2019/7/11 - 23:00
 */
//群主的类
public class Manager extends  User {

    public Manager() {
    }

    public Manager(String name, Integer money) {
        super(name, money);
    }

    public ArrayList<Integer> send(int totalMoney,int count) {
        //首先需要创建一个集合，用来存储若干个红包
        ArrayList<Integer> redList = new ArrayList<>();
        //首先看看群主有多少钱
        int leftMoney = super.getMoney();
        if (totalMoney > leftMoney) {
            System.out.println("余额不足，请充值");
            return redList;
        }
        //扣钱，其实就是重新设置余额
        super.setMoney(leftMoney - totalMoney);
        //红包需要平均拆分成count份
        int avg = totalMoney / count;
        int mod = totalMoney % count;
        //除不开的零头，包在最后一个红包当中
        //下面把红包放到集合中去
        for (int i = 0; i < count - 1; i++) {
            redList.add(avg);
        }
        //最后一个红包
        int last = avg + mod;
        redList.add(last);
        return redList;
    }
}

package cn.hope.day09.demo09;


import java.util.ArrayList;

/**
 * @author newcityman
 * @date 2019/7/11 - 23:36
 */
public class MainRedPacket {
    public static void main(String[] args) {
        Manager m = new Manager("群主",100);
        Member one = new Member("zmy",0);
        Member two = new Member("zmk",0);
        Member three = new Member("zmh",0);

        m.show();
        one.show();
        two.show();
        three.show();
        System.out.println("========================");
        ArrayList<Integer> list = m.send(20,3);
        one.receive(list);
        two.receive(list);
        three.receive(list);

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





    }


}