User类创建

public class User {
    private String name;
    private int money;

    public User(){

    }

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

    public void show(){
        System.out.println("Name:"+name+" Money:"+money);
    }

    public String getName() {
        return name;
    }

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

    public int getMoney() {
        return money;
    }

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

​

Manage类

import java.util.ArrayList;

public class Manager extends User{

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

    public Manager() {
        super();
    }
//需要一个集合用来存储发红包的个数以及各个金额
    public ArrayList<Integer> List(int totalmoney,int count){//发的钱
        ArrayList<Integer> list = new ArrayList<>();

        int leftmoney = super.getMoney();//群主总共的钱

        if(leftmoney < totalmoney) return list;//群主没那么多钱

        int averagemoney = totalmoney/count;//平均每个人
        int modemoney = totalmoney%count;//除不尽的余数加在list最后一个

        for(int i = 0 ; i < count-1 ; i++){
            list.add(averagemoney);
        }

        super.setMoney(leftmoney - totalmoney);//群主剩的钱

        list.add(modemoney+averagemoney);
        return list;//返回红包集合

    }
}

Member类

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

public class Member extends User{
    public Member() {
        super();
    }

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

    public void receive(ArrayList<Integer> list){

        int random = new Random().nextInt(list.size());//随即索引

        int num = list.remove(random);//将这个数去除，并且取出

        int money = super.getMoney()+num;//把钱加上

        super.setMoney(money);//更新前的金额

    }
}

调用

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

public class Using {
    public static void main(String[] args) {
        Member A= new Member("贤哥",0);
        Member B = new Member("超哥",0);
        Member C = new Member("小哥",0);
        Manager qun = new Manager("群主",10000);

        System.out.println("原来的钱");
        qun.show();
        A.show();
        B.show();
        C.show();
        System.out.println("================");

        System.out.println("你想发多少");
        int F = new Scanner(System.in).nextInt();

        ArrayList<Integer> list = qun.List(F,3);


        A.receive(list);
        B.receive(list);
        C.receive(list);

        qun.show();
        A.show();
        B.show();
        C.show();
    }
}

运行结果：