public class User {     private String name;     private  int money;// 当前用户拥有的钱数 public User() { } public User(String name, int money) { this.name = name; this.money = money; } public void show(){ System.out.println("我叫"+name+", 我有多少钱"+money); } public void setName(String name) { this.name = name; } public void setMoney(int money) { this.money = money; } public String getName() { return name; } public int getMoney() { return money; } }

import java.util.ArrayList; import java.util.Random; public class Number extends User {
      public Number() {     } public Number(String name, int money) { super(name, money); } public void recive(ArrayList
    
      list) { // 从多个红包当中随机抽取一个给自己 int index = new Random().nextInt(list.size()); // 根据索引，从集合当中删除。并且得到被删除的红包给我自己 int delta= list.remove(index); //当前成员自自己有多少钱 int money = super.getMoney(); //加法，并且重新设置回去 super.setMoney(money+delta); } }
    

public class Maneger extends User {
    public Maneger(){     } public Maneger(String name, int money) {         super(name, money); } public ArrayList
    
      send(int totalmoney, int count){ //首先需要一个集合,用来存储若干个红包的金额 ArrayList
     
       redList=new ArrayList<>(); int leftmoney = super.getMoney(); // 群主当前余额 if (totalmoney > leftmoney){ System.out.println("金额不足"); return redList; } // 扣钱，其实就是重新设置余额 super.setMoney(leftmoney-totalmoney); // 发红包需要拆分成count份 int avg=totalmoney / count; int mod =totalmoney % count;//也就是说余下的零头 // 剩下的零头，抱在最后一个红包当中 // 下面把红包放在集合当中 for (int i = 0; i < count-1; i++) { redList.add(avg); } int last=avg+mod; redList.add(last); return redList; } }
     
    

public class MainRedPacket {     public static void main(String[] args) {         Maneger maneger= new Maneger("群主",100); Number one = new Number("成员A",0); Number two = new Number("成员A",0); Number three = new Number("成员A",0); maneger.show(); one.show(); two.show(); three.show(); System.out.println("============"); //群主发20 分3个红包 ArrayList
    
      redList =maneger.send(20,3); // 三个成员去收红包 one.recive(redList); two.recive(redList); three.recive(redList); maneger.show(); one.show(); two.show(); three.show(); } }