Account类

在提款方法 an中，需要判断用户余额是否能够满足提款数额的要求，如果不能， 应给出提示。
deposit()方法表示存款。

Customer类

Bank类

  • addCustomer 方法必须依照参数(姓 , 名)构造一个新的 Customer 对象，然后把 它放到 customer 数组中。还必须把 numberOfCustomer 属性的值加 1。
  • getNumOfCustomers 方法返回 numberofCustomers 属性值。
  • getCustomer 方法返回与给出的 index 参数相关的客户。

创建 BankTest 类进行测试

实现代码参考

1. Account

  1. package pers.zyx.accountcustomerbank;
  3. public class Account {
  4.     private double balance;
  6.     public Account(double initBalance){
  7.         this.balance = initBalance;
  8.     }
  9.     public double getBalance(){
  10.         return balance;
  11.     }
  13.     // 存钱
  14.     public void deposit(double amt){
  15.         if(amt > 0){
  16.             balance += amt;
  17.             System.out.println("存钱成功");
  18.         }
  19.     }
  21.     // 取钱
  22.     public void withdraw(double amt){
  23.         if(balance >= amt){
  24.             balance -= amt;
  25.             System.out.println("取钱成功");
  26.         }else{
  27.             System.out.println("余额不足");
  28.         }
  29.     }
  30. }

2. Customer

  1. package pers.zyx.accountcustomerbank;
  3. public class Customer {
  4.     private String firstName;
  5.     private String lastName;
  6.     private Account account;
  8.     public Customer(String f , String l){
  9.         this.firstName = f;
  10.         this.lastName = l;
  11.     }
  13.     public String getFirstName() {
  14.         return firstName;
  15.     }
  16.     public String getLastName() {
  17.         return lastName;
  18.     }
  20.     public Account getAccount() {
  21.         return account;
  22.     }
  24.     public void setAccount(Account account) {
  25.         this.account = account;
  26.     }
  27. }

3. Bank

  1. package pers.zyx.accountcustomerbank;
  3. public class Bank {
  4.     private Customer[] customer;
  5.     private int numberOfCustomers;
  7.     public Bank(){
  8.         customer = new Customer[100];
  9.     }
  11.     // 添加客户
  12.     public void addCustomer(String f , String l){
  13.         Customer cust = new Customer(f , l);
  14.         customer[numberOfCustomers++] = cust;
  15.     }
  17.     // 获取客户个数
  18.     public int getNumOfCustomers(){
  19.         return numberOfCustomers;
  20.     }
  22.     // 获取指定位置上的客户
  23.     public Customer getCustomer(int index){
  24.         if(index >= 0 && index < numberOfCustomers){
  25.             return customer[index];
  26.         }
  27.         else{
  28.             return null;
  29.         }
  30.     }
  31. }

4. BankTest

  1. package pers.zyx.accountcustomerbank;
  3. public class BankTest {
  4.     public static void main(String[] args) {
  5.         Bank bank = new Bank();
  6.         bank.addCustomer("Jane","Smith");
  7.         bank.getCustomer(0).setAccount(new Account(2000));
  8.         bank.getCustomer(0).getAccount().withdraw(500);
  9.         double balance = bank.getCustomer(0).getAccount().getBalance();
  10.         System.out.println("Balance = " + balance);
  11.     }
  12. }

备注