繼承-簡單分發紅包開發實例

package cn.learn.chouxiang.practice03;

public class Users {
    private String name; //姓名
    private double money; //餘額

    public void show(){
        System.out.println(String.format("個人名字是：%s,我還剩：%.2f\n",this.name,this.money));
    }

    public Users() {
    }

    public Users(String name, double money) {
        this.name = name;
        this.money = money;
    }

    public String getName() {
        return name;
    }

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

    public double getMoney() {
        return money;
    }

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

package cn.learn.chouxiang.practice03;

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

public class Manager extends Users {
    public Manager() {
    }

    public Manager(String name, double money) {
        super(name, money);  //若是主程序new 出來，則子類含父類，與另外一個繼承會獨立開來
    }

    public ArrayList<Double> send(int totalMoney, int count){

        //首先用集合存儲若干個紅包金額
        ArrayList<Double> readList=new ArrayList<>();

        //首先要看羣主的餘額
        double lefMoney = super.getMoney();  //羣主的前

        if(totalMoney > lefMoney){
            System.out.println("沒錢啦");
            return readList;
        }
        //扣錢
        else{
            super.setMoney(lefMoney-totalMoney);
            double leftSum=totalMoney;
            for (int i = 0; i < count ; i++) {
                double avg=(double)leftSum / (new Random(3).nextDouble()+2.4);
                leftSum -=avg;
                //把紅包放入集合
                readList.add(avg);
                //最後一個紅包單獨處理
                if(i == count-1)
                    readList.add(leftSum);
            }
            System.out.println("紅包："+readList+"共計："+readList.stream().mapToDouble(Double::doubleValue).sum());
            return readList;
        }

    }
}

package cn.learn.chouxiang.practice03;

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

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

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

    //收紅包
    public void recieve(ArrayList<Double> list){
        //從集合隨機抽取一個放入紅包
        //首先獲得紅包索引值
        int index = new Random().nextInt(list.size());
        //刪除這個索引值的紅包,並把錢存入餘額
        double money=list.remove(index);
        super.setMoney(money+super.getMoney());


    }
}

package cn.learn.chouxiang.practice03;

import java.util.ArrayList;

public class Enter {
    public static void main(String[] args) {
        Manager qunzhu=new Manager("羣主",55.0);
        Member  qunyuan1=new Member("羣員A",0.0);
        Member  qunyuan2=new Member("羣員B",0.0);
        Member  qunyuan3=new Member("羣員C",0.0);
        Member  qunyuan4=new Member("羣員D",0.0);
        Member  qunyuan5=new Member("羣員E",0.0);
        Member  qunyuan6=new Member("羣員F",0.0);

        //發紅包
        ArrayList<Double> list=qunzhu.send(30,6);

        //收紅包
        qunyuan1.recieve(list);
        qunyuan2.recieve(list);
        qunyuan3.recieve(list);
        qunyuan4.recieve(list);
        qunyuan5.recieve(list);
        qunyuan6.recieve(list);

        qunzhu.show();
        qunyuan1.show();
        qunyuan2.show();
        qunyuan3.show();
        qunyuan4.show();
        qunyuan5.show();
        qunyuan6.show();

    }
}

//總結：格式化輸出，熟悉隨機數的生成，ArrayList的運用