Java 数组对象 小测试

 1 package com.bytezero.bank;
 2 /**
 3  *
 4  * @Description
 5  * @author  Bytezero·zhenglei!      Email:420498246@qq.com
 6  * @version
 7  * @date 2021年9月15日下午11:53:31
 8  * @
 9  *
10  */
11 public class BankTest
12 {
13     public static void main(String[] args)
14     {
15         Bank bank = new Bank();
16
17
18         bank.addCustomer("Byte", "zero");
19
20
21         //连续操作
22         bank.getCunstomer(0).setAccount(new Account(2000));
23
24         bank.getCunstomer(0).getAccount().withdraw(500);
25
26         double balance    = bank.getCunstomer(0).getAccount().getBalance();
27
28         System.out.println("客户"+bank.getCunstomer(0).getFirstName()+"的账户余额为："+balance);
29
30         System.out.println("*******************************");
31
32         bank.addCustomer("Byte2", "zero2");
33
34         bank.getCunstomer(1).setAccount(new Account(2000));
35
36         bank.getCunstomer(1).getAccount().withdraw(500);
37
38         double balance1    = bank.getCunstomer(1).getAccount().getBalance();
39
40         System.out.println("客户"+bank.getCunstomer(1).getFirstName()+"的账户余额为："+balance);
41
42
43         System.out.println("银行客户的个数为："+bank.getNumberOfCustomers());
44
45     }
46 }

 1 package com.bytezero.bank;
 2
 3 public class Bank {
 4
 5     private Customer[] customers; //存放多个客户的数组
 6
 7     //private Customer[] customers=10; //1:
 8     private int numberOfCustomers; //记录客户的个数
 9
10     public Bank()
11     {
12         customers = new Customer[10];  //1:
13     }
14
15     //添加客户
16     public void addCustomer(String f,String l)
17     {
18         Customer cust = new Customer(f,l);
19 //        customers[numberOfCustomers] = cust;
20 //        numberOfCustomers++;
21         customers[numberOfCustomers++] = cust;
22
23
24     }
25
26
27     //获取客户的个数
28     public int getNumberOfCustomers()
29     {
30         return numberOfCustomers;
31     }
32
33     //取指定位置的客户
34     public Customer getCunstomer(int index)
35     {
36 //        return customers[index];   //可能报异常
37         if(index >= 0 && index < numberOfCustomers)
38         {
39             return customers[index];
40         }
41
42         return null;
43     }
44
45 }

 1 package com.bytezero.bank;
 2
 3 public class Account
 4 {
 5     private double balance;
 6
 7
 8     public Account(double init_balance)
 9     {
10         this.balance = init_balance;
11     }
12
13     public double getBalance()
14     {
15         return balance;
16     }
17
18     //存钱操作
19     public void deposit(double amt)
20     {
21         if(amt > 0)
22         {
23             balance += amt;
24             System.out.println("存钱成功！");
25         }
26     }
27
28     //取钱操作
29     public void withdraw(double amt)
30     {
31         if(balance >= amt)
32         {
33             balance -= amt;
34             System.out.println("取钱成功");
35
36
37         }
38         else
39         {
40             System.out.println("余额不足");
41         }
42     }
43
44 }

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