类的继承之发红包的案例----Java

 1 public class User {
 2 
 3     private String name ;  //姓名
 4     private int money ;  //金额
 5 
 6     public User() {
 7     }
 8 
 9     public User(String name, int money) {
10         this.name = name;
11         this.money = money;
12     }
13     // 展示当前用户有多少钱
14     public void show(){
15         System.out.println("姓名：" + name +"    余额：" + money);
16     }
17     public String getName() {
18         return name;
19     }
20 
21     public void setName(String name) {
22         this.name = name;
23     }
24 
25     public int getMoney() {
26         return money;
27     }

 1 import java.util.ArrayList;
 2 
 3 public class Manager extends User{
 4 
 5     public Manager(){
 6         //super();默认赠送
 7     }
 8 
 9     public Manager(String name, int money) {
10         super(name, money);
11     }
12 
13 
14     public ArrayList<Integer> send(int totalMoney, int count){
15 
16         ArrayList<Integer> redList = new ArrayList<>();
17         //首先看一下，群主有多少钱
18         //int leftMoney = super.money;  错误写法
19         int leftMoney = super.getMoney();
20         if(leftMoney < totalMoney){
21             System.out.println("余额不足");
22             return redList; //返回空集合
23         }
24         //扣钱，其实就是重新设置余额
25         super.setMoney(leftMoney - totalMoney);
26 
27         //发红包，平均发成count份
28         int avg = totalMoney / count;
29         int mod = totalMoney % count;
30 
31         //除不开的零头放在最后一个红包中
32         //下面吧红包放在集合中
33         for (int i = 0; i < count-1; i++) {
34             redList.add(avg);
35         }
36         //最后一个红包
37         int last = avg + mod;
38         redList.add(last);
39 
40         return redList;
41     }
42 }

 1 import java.util.ArrayList;
 2 import java.util.Random;
 3 
 4 public class Member extends User{
 5 
 6     public Member() {
 7     }
 8 
 9     public Member(String name, int money) {
10         super(name, money);
11     }
12 
13     public void receive(ArrayList<Integer> list){
14         //从众多红包中抽取一个给自己
15         //随机获取一个集合当中的索引编号
16         int index = new Random().nextInt(list.size());
17         //根据索引从集合中删除,并把删除的红包给自己
18         int delta = list.remove(index);
19 
20         //当前成员自己有多少钱
21         int money = super.getMoney();
22         //领了红包后多少钱
23         super.setMoney(money + delta);
24     }
25 }

 1 import java.util.ArrayList;
 2 
 3 public class MainRedPacket {
 4 
 5     public static void main(String[] args) {
 6         Manager manager = new Manager("群主", 200);
 7 
 8         Member one = new Member("成员A", 0);
 9         Member two = new Member("成员B", 0);
10         Member three = new Member("成员C", 0);
11         Member four = new Member("成员D", 0);
12         Member five = new Member("成员E", 0);
13         Member six = new Member("成员F", 0);
14 
15         manager.show();
16         one.show();
17         two.show();
18         three.show();
19         four.show();
20         five.show();
21         six.show();
22         System.out.println("==========");
23 
24 
25         //群主开始发红包
26         ArrayList<Integer> redList = manager.send(168, 6);
27         one.receive(redList);
28         two.receive(redList);
29         three.receive(redList);
30         four.receive(redList);
31         five.receive(redList);
32         six.receive(redList);
33 
34         //领完红包后，各自金额多少
35         manager.show();
36         one.show();
37         two.show();
38         three.show();
39         four.show();
40         five.show();
41         six.show();
42         System.out.println("==========");
43     }
44 
45 }