零基础学Java—发红包案例（二十三）

Posted 2022-04-11 王同学要努力

【零基础学Java】—发红包案例（二十三）

题目描述：

分析：


代码实现：

public class User 
    private  String name;
    private  int money;

    public User() 
    

    public User(String name, int money) 
        this.name = name;
        this.money = money;
    
    //显示当前用户有多少钱
    public  void show()
        System.out.println("我叫："+ name+",我有多少钱："+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;
    

//群主的类
public class Manager extends User 
    public Manager() 

    

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

    public ArrayList<Integer> send(int totalMoney, int count) 
        //首先需要一个集合，用来存储若干个发红包的案例
        ArrayList<Integer> redList = new ArrayList<>();

        //
        int leftMoney=super.getMoney();
        if(totalMoney>leftMoney)
            System.out.println("余额不足");
            return redList;
        
            //扣钱
        super.setMoney(leftMoney-totalMoney);

        //发红包平均拆分为count份
        int avg=totalMoney/count;
        int mod=totalMoney %count;//余数
        //剩下的零头包在最后一个红包里
        for (int i = 0; i < count-1; i++) 
            redList.add(avg);
        
        int last=avg+mod;
        redList.add(last);
        return  redList;
    

//普通成员
public class Member extends User 
    public Member() 
    

    public Member(String name, int money) 
        super(name, money);
    
    public  void receive(ArrayList<Integer> list)
        //从多个红包中抽取一个
        //随机获取一个集合当中的索引编号
        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，给我自己
        int delta=list.remove(index);
        //自己本类有多少钱
        int money=super.getMoney();
        super.setMoney(money+delta);
    

public class MainRed 
    public static void main(String[] args) 
        Manager manager=new Manager("群主",100);
        Member one=new Member("成员A",0);
        Member two=new Member("成员B",0);
        Member three=new Member("成员C",0);

        manager.show();
        one.show();
        two.show();
        three.show();
        System.out.println("=======");

//群主总共发20，分成3个红包
        ArrayList<Integer> redList=manager.send(20,3);

   //三个普通成员收红包
        one.receive(redList);
        two.receive(redList);
        three.receive(redList);

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