JAVA 實現簡單的發紅包案例

package Demo511;  2 
import java.util.ArrayList;  4 
public class DemoSend {  6     public static void main(String[] args) {  7         Manager manager =new Manager("群主",1000);  8         Member one =   new Member("成員A",0);  9         Member two =   new Member("成員B",0); 10         Member three = new Member("成員C",0); 11         Member four =  new Member("成員D",0); 12         Member five =  new Member("成員E",0); 13 
        ArrayList<Integer> redlist =manager.send(666,5); 15 
 one.receive(redlist); 17  two.receive(redlist); 18  three.receive(redlist); 19  four.receive(redlist); 20  five.receive(redlist); 21 
 manager.show(); 23  one.show(); 24  two.show(); 25  three.show(); 26  four.show(); 27  five.show(); 28  } 29 }

👇是成員類，群主繼承成員，群員繼承成員

package Demo511;  2 
public class User {  4     private String name ;  5     private int money;  6 
    public User(){  8 
 } 10 
    public User(String name,int money) { 12         this.money=money; 13         this.name = name; 14  } 15     //展示一下，當前用戶的錢
    public void show(){ 17         System.out.println("我叫："+name+",還有"+money+"塊錢"); 18  } 19     public String getName(){ 20         return name; 21  } 22     public void setName(String name){ 23         this.name=name; 24  } 25     public int getMoney(){ 26         return money; 27  } 28     public void setMoney(int money){ 29         this.money=money; 30  } 31 }

package Demo511;  2 
import java.util.ArrayList;  4 /*
默認構造，有參構造  6  */
public class Manager extends User{  8         public Manager(){  9  } 10     public Manager(String name, int money) { 11         super(name, money); 12  } 13     public ArrayList<Integer> send(int totalMoney,int count) { 14             //用一個集合，來存儲若干個紅包的金額
        ArrayList<Integer> redList = new ArrayList<>(); 16                     //查看群主的金錢余額
        int leftMoney =super.getMoney();//群主當前余額
        if (totalMoney>leftMoney){ 19             System.out.println("余額不足"); 20             return  redList;  //返回空集合
 } 22         //扣錢就是重新設置余額
        super.setMoney(leftMoney-totalMoney); 24          //發紅包需要評分count份
        int avg =totalMoney/count; 26         int mod =totalMoney%count; 27         //除不開的金錢，放到最后一個紅包里面
        for (int i = 0; i < count-1; i++) { 29  redList.add(avg); 30  } 31         redList.add(avg+mod); 32         return redList; 33  } 34 }

package Demo511;  2 
import java.util.ArrayList;  4 import java.util.Random;  5 
public class Member extends User {  7     public Member() {  8  }  9     public Member(String name, int money) { 10         super(name, money); 11  } 12     public void receive(ArrayList<Integer>list){ 13         //從多個紅包當中抽取一個給我。 14         //隨機獲取一個集合的索引編號。
        int index =new Random().nextInt(list.size()); 16         //刪除一個隨機紅包，並且給我。
        int detal = list.remove(index); 18         int money = super.getMoney(); 19         super.setMoney(money+detal); 20  } 21 }

代碼運行👇