随机发红包

Posted 2021-12-30 xinglingzhiren

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<Integer> 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<Integer> 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<Integer> 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<Integer> 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();