Java 封装+构造器+this 小测试

 1 package com.bytezero.account;
 2
 3
 4 public class Account
 5 {
 6     private int id;     //账号
 7     private double balance;  //余额
 8     private double annualInterestRate; //年利率
 9
10
11     //构造器
12     public Account(int id, double balance, double annualInterestRate)
13     {
14
15         this.id = id;
16         this.balance = balance;
17         this.annualInterestRate = annualInterestRate;
18     }
19
20
21     // set  get
22     public int getId()
23     {
24         return id;
25     }
26
27
28     public void setId(int id)
29     {
30         this.id = id;
31     }
32
33
34     public double getBalance()
35     {
36         return balance;
37     }
38
39
40     public void setBalance(double balance)
41     {
42         this.balance = balance;
43     }
44
45
46     public double getAnnualInterestRate()
47     {
48         return annualInterestRate;
49     }
50
51
52     public void setAnnualInterestRate(double annualInterestRate)
53     {
54         this.annualInterestRate = annualInterestRate;
55     }
56
57     //方法
58     public void withdraw(double amount)   //取钱
59     {
60         if(balance < amount)
61         {
62             System.out.println("取款失败！！！！");
63             return;
64         }
65         balance -= amount;
66         System.out.println("成功取出:"+ amount);
67     }
68     public void dsposit(double amount)  //存钱
69     {
70         if(amount > 0)
71         {
72             balance += amount;
73             System.out.println("成功存入"+amount);
74         }
75     }
76
77
78
79
80
81
82 }

 1 package com.bytezero.account;
 2
 3 public class Customer
 4 {
 5     private String firstName;
 6     private String laseName;
 7     private Account account;
 8
 9
10
11     public Customer(String f,String l)
12     {
13         this.firstName = f;
14         this.laseName = l;
15     }
16
17
18
19     public Account getAccount() {
20         return account;
21     }
22
23
24
25     public void setAccount(Account account) {
26         this.account = account;
27     }
28
29
30
31     public String getFirstName() {
32         return firstName;
33     }
34
35
36
37     public String getLaseName() {
38         return laseName;
39     }
40
41
42
43
44
45
46
47
48 }

 1 package com.bytezero.account;
 2
 3 /**
 4  *
 5  * @Description
 6  * @author  Bytezero·zhenglei!      Email:420498246@qq.com
 7  * @version
 8  * @date 2021年9月15日下午9:55:22
 9  * @  小测试
10  *
11  */
12 public class CustomerTest
13 {
14     public static void main(String[] args)
15     {
16         Customer cust = new Customer("Jane","Smith");
17
18         Account acct = new Account(1000, 2000, 0.0123);
19
20         cust.setAccount(acct);
21
22         cust.getAccount().dsposit(100);
23         cust.getAccount().withdraw(960);
24         cust.getAccount().withdraw(2000);
25
26         System.out.println("客户叫："+cust.getFirstName()+cust.getLaseName());
27         System.out.println("客户的id："+cust.getAccount().getId());
28
29     }
30 }