java继承学习案例

群主把对应金额，等分随机分给用户
基础类

package com.learn.Demo2;

public class User {
    private String name;   //姓名
    private int money;     //余额，也就是当前用户

    public User() {
    }

    public User(String name, int money) {
        this.name = name;
        this.money = money;
    }
    public  void  show(String name , int money){
        System.out.println("姓名： "+ name+";"+"余额： "+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;
    }
}

群主类

package com.learn.Demo2;

import java.util.ArrayList;

public class Manager extends User {

    public Manager() {
    }
    public Manager(String name,int money){
        super(name,money);
    }
//    发送红包的方法
    public ArrayList send(int totalMoney, int count){
//        首先需要一个集合，用来存储若干个红包金额
        ArrayList receive = new ArrayList<>();
//        首先看一下群主自己有多少钱
        if(super.getMoney() < totalMoney){
            System.out.println("余额不足");
            return receive; //返回空集合
        }
//        扣钱，重新设置余额
        super.setMoney(super.getMoney()-totalMoney);
        int avg=totalMoney / count;
        int balance=totalMoney % count;
        for (int i = 0;i< count -1;i++){
            receive.add(avg);
        }
        receive.add(avg+balance);
//        返回列表
        return receive;
    }
}

用户类

package com.learn.Demo2;

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

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

    public Member(String name, int money) {
        super(name, money);
    }
//    给用户分配红包金额
public  void  receive(ArrayList list){
        int listIndex= new Random().nextInt(list.size());
        int delta=list.remove(listIndex);
        int money = super.getMoney();
        super.setMoney(money+delta);
    }
}

main方法

package com.learn.Demo2;

import java.util.ArrayList;

public class MainRedPacket {
    public static void main(String[] args) {
//        设置群主的余额
        Manager manager=new Manager("群主",100);
        System.out.println(manager.getName()+"----"+manager.getMoney());
//        设置用户的余额
        Member one=new Member("one",0);
        Member two=new Member("two",0);
        Member three=new Member("two",0);
        System.out.println(one.getName()+"----"+one.getMoney());
        System.out.println(two.getName()+"----"+two.getMoney());
        System.out.println(three.getName()+"----"+three.getMoney());
//        获取红包列表
        ArrayList list =manager.send(20,3);
        System.out.println(list);
//        分配红包
        one.receive(list);
        two.receive(list);
        three.receive(list);
        System.out.println(one.getName()+"----"+one.getMoney());
        System.out.println(two.getName()+"----"+two.getMoney());
        System.out.println(three.getName()+"----"+three.getMoney());
    }
}

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