//页面一
public class Bank {
private Customer[] customers;//用于存放客户
private int numberOfCustomers;//记录Customer的个数
private Bank() {
customers = new Customer[5];
}
private static Bank bank = new Bank();
public static Bank getBanking() {
return bank;
}
//添加一个Customer到数组里
public void addCustomer(String f,String l) {
Customer cust = new Customer(f,l);
customers[numberOfCustomers] = cust;
numberOfCustomers++;
}
//获取Customer的个数
public int getNumOfCustomers() {
return numberOfCustomers;
}
//返回指定索引位置的Customer
public Customer getCustomer(int index) {
return customers[index];
}
}
//页面二
public class Customer {
private String firstName;
private String lastName;
private Account account;
public Customer(String f,String l) {
firstName = f;
lastName = l;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public Account getAccount() {
return account;
}
public void setAccount(Account account) {
this.account = account;
}
}
//页面三
//账户
public class Account {
protected double balance;//账户余额
/**
* @param balance
*/
public Account(double balance) {
super();
this.balance = balance;
}
public double getBalance() {
return balance;
}
//存钱
public boolean deposit(double amt) {//amt:要存的额度
balance += amt;
return true;
}
//取钱
public void withdraw(double amt) throws OverdraftException {//amt:要取的额度
if(balance >= amt) {
balance -= amt;
}else {
throw new OverdraftException("余额不足",amt - balance);
}
}
}
//页面四
//存储账户
public class SavingAccount extends Account{
private double interestRate;//利率
public SavingAccount(double balance,double init_rate) {
super(balance);
this.interestRate = init_rate;
}
}
//页面五
public class CheckingAccount extends Account{
private Double overdraftProtection;//透支额度
public CheckingAccount(double balance) {
super(balance);
}
/**
* @param balance
* @param overdraftProtection
*/
public CheckingAccount(double balance, double overdraftProtection) {
super(balance);
this.overdraftProtection = overdraftProtection;
}
public double getOverdraftProtection() {
return overdraftProtection;
}
public void setOverdraftProtection(double overdraftProtection) {
this.overdraftProtection = overdraftProtection;
}
@Override
public void withdraw(double amt) throws OverdraftException{//amt:要取的额度
if(balance >= amt) {
balance -= amt;
}else {
if(overdraftProtection == null) {
throw new OverdraftException("没有透支额度取款失败，还差",amt - balance);
}else if(overdraftProtection < amt - balance){
throw new OverdraftException("透支额度不足取款失败，还差",amt - balance-overdraftProtection);
}else {
overdraftProtection -= (amt - balance);
balance = 0;
}
}
}
}
//页面六
public class TestBanking {
public static void main(String[] args) {
Bank bank = Bank.getBanking();
Customer customer;
Account account;
//Create two customers and their account
bank.addCustomer("Jane","Simms");
customer = bank.getCustomer(0);
customer.setAccount(new SavingAccount(500.00,0.05));
customer.setAccount(new CheckingAccount(200.00,500.00));
bank.addCustomer("Owen","Bryant");
customer = bank.getCustomer(1);
customer.setAccount(new CheckingAccount(200.00));
//Test the checking account of Jane Simms(with overdraft protection)
customer = bank.getCustomer(0);
account = customer.getAccount();
System.out.println("Customer [" + customer.getLastName()
+ "," + customer.getFirstName() + "] :"
+ "has a checking balance of "
+ account.getBalance()
+" with a 500.00 overdraftProtection.");
try {
System.out.println("Checking Acct [Jane Simms] : withdraw 150.00");
account.withdraw(150.00);
System.out.println("Checking Acct [Jane Simms] : deposit 22.50");
account.deposit(22.50);
System.out.println("Checking Acct [Jane Simms] : withdraw 147.62");
account.withdraw(147.62);
System.out.println("Checking Acct [Jane Simms] : withdraw 470.00");
account.withdraw(470.00);
}catch(OverdraftException e1) {
System.out.println("Exception: " + e1.getMessage()
+ " Deficit: " + e1.getDeficit());
}finally {
System.out.println("Customer [" + customer.getLastName()
+ "," + customer.getFirstName() + "]"
+ " has a checking balance of "
+ account.getBalance());
}
System.out.println();
//Test the checking account of Owen Bryant(without overdraft protection)
customer = bank.getCustomer(1);
account = customer.getAccount();
System.out.println("Customer [" + customer.getLastName()
+ "," + customer.getFirstName() + "]"
+ " has a checking balance of "
+ account.getBalance());
try {
System.out.println("Checking Acct [Owen Bryant] : withdraw 100.00 ");
account.withdraw(100.00);
System.out.println("Checking Acct [Owen Bryant] : deposit 22.50 ");
account.deposit(22.50);
System.out.println("Checking Acct [Owen Bryant] : withdraw 175.00 ");
account.withdraw(175.00);
}catch(OverdraftException e1){
System.out.println("Exception: " + e1.getMessage()
+ " Deficit: " + e1.getDeficit());
}finally {
System.out.println("Customer [" + customer.getLastName()
+ "," + customer.getFirstName() + "]"
+ " has a checking balance of "
+ account.getBalance());
}
System.out.println();
}
}
//页面七
public class OverdraftException extends Exception{
static final long serialVersionUID = -338751124229948L;
private double deficit;//表示所取的钱与余额的差额
public double getDeficit() {
return deficit;
}
public OverdraftException(String msg,double deficit) {
super(msg);
this.deficit = deficit;
}
}