package banking2;

//账户

public class Account {

    private double balance;// 账户余额

    public Account(double init_balance) {

        balance = init_balance;

    }

    public double getBlance() {

        return balance;

    }

    // 存钱

    public void deposit(double amt) {// amt 要存的额度

        balance += amt;

    }

    // 取钱

    public void withdraw(double amt) {// amt：要取得额度

        if (balance >= amt) {

            balance -= amt;

        } else {

            System.out.println("余额不足");

        }

    }

}

package banking2;

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 acct) {

        account = acct;

    }

}

package TestBanking;

/*

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

 * It creates a new Bank, sets the Customer (with an initial balance),

 * and performs a series of transactions with the Account object.

 */

import banking2.Account;

import banking2.Customer;

public class TestBanking2 {

    public static void main(String[] args) {

        Customer customer;

        Account account;

        // Create an account that can has a 500.00 balance.

        account = new Account(500.00);

        System.out.println("Creating the customer Jane Smith.");

        customer = new Customer("Jane", "Smith");

        customer.setAccount(account);

        // code

        System.out.println("Creating her account with a 500.00 balance.");

        // code

        customer.getAccount().withdraw(150);

        System.out.println("Withdraw 150.00");

        // code

        customer.getAccount().deposit(22.50);

        System.out.println("Deposit 22.50");

        // code

        customer.getAccount().withdraw(47.62);

        System.out.println("Withdraw 47.62");

        // code

        // Print out the final account balance

        System.out.println("Customer [" + customer.getLastName() + ", " +

 customer.getFirstName()+ "] has a balance of " + customer.getAccount().getBlance());

    }

}