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public CheckingAccount(double bal, double protect)

public CheckingAccount(double bal) //bal：初时账户余额，protect：透支额度

d)类CheckingAccount必须覆盖父类withdraw 方法。实现以下功能：如果余额足够取，按正常方式取钱，否则将判断透支是否超过额度，超过不能取，没超过可以正常取钱。并返回boolean型变量。

3)SavingsAccount类(储蓄卡帐户)

a)SavingsAccount类为Account的子类

b)属性interestRate为利率

c)含有两个参数的构造器，注意必需要调用父类的一个参数的构造器。

public SavingsAccount(double bal, double rate) //bal：账户余额//rate 利率

4)Customer类

a)声明四个属性： firstName, lastName，numberOfAccounts and accounts数组

b)声明2个参数的构造器 (f and l) 给属性赋初值

c)declare two public accessors for the object attributes; these methods getFirstName and getLastName simply return the appropriate attribute

d)声明setAccount方法赋帐号

e)其余参考UML图

5) Bank类

参考UML图

6)TestBanking类[1]，该类为未完成类，在step1和step2位置按要求补充完整。

//TestBanking.java

/*

* This class creates the program to test the banking classes.

* It creates a set of customers, with a few accounts each,

* and generates a report of current account balances.

*/

import banking.*;

import java.text.NumberFormat;

public class TestBanking {

public static void main(String[] args) {

NumberFormat currency_format = NumberFormat.getCurrencyInstance();

Bank bank = new Bank();

Customer customer;

// Create several customers and their accounts

bank.addCustomer("Jane", "Simms");

customer = bank.getCustomer(0);

customer.addAccount(new SavingsAccount(500.00, 0.05));

customer.addAccount(new CheckingAccount(200.00, 400.00));

bank.addCustomer("Owen", "Bryant");

customer = bank.getCustomer(1);

customer.addAccount(new CheckingAccount(200.00));

bank.addCustomer("Tim", "Soley");

customer = bank.getCustomer(2);

customer.addAccount(new SavingsAccount(1500.00, 0.05));

customer.addAccount(new CheckingAccount(200.00));

bank.addCustomer("Maria", "Soley");

customer = bank.getCustomer(3);

// Maria 和 Tim 共有一个信用卡帐号

customer.addAccount(bank.getCustomer(2).getAccount(1));

customer.addAccount(new SavingsAccount(150.00, 0.05));

// 生成报表

System.out.println("\t\t\tCUSTOMERS REPORT");

System.out.println("\t\t\t================");

for ( int cust_idx = 0; cust_idx < bank.getNumOfCustomers(); cust_idx++ ) {

customer = bank.getCustomer(cust_idx);

System.out.println();

System.out.println("Customer: "

+ customer.getLastName() + ", "

+ customer.getFirstName());

for ( int acct_idx = 0; acct_idx < customer.getNumOfAccounts(); acct_idx++ ) {

Account account = customer.getAccount(acct_idx);

String account_type = "";

//测试帐号类型

/*** Step 1:

**** 使用instanceof 测试帐号类型

**** 设置变量 account_type 到合适的值，如

**** "Savings Account" 或 "Checking Account".

***/

// 打出当前帐号余额

/*** Step 2:

**** 打出帐号类型和余额

****参考变量currency_format 的类型，找到API文档，格式化输出数据

**** 生成帐号字符串.

***/

}

}

}

}

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