1  /**

  2     A bank account has a balance that can be changed by 

  3     deposits and withdrawals.

  4  */

  5  public class BankAccount

  6  {  

  7     private double balance;

  8  

  9     /**

 10        Constructs a bank account with a zero balance.

 11     */

 12     public BankAccount()

 13     {   

 14        balance = 0;

 15     }

 16  

 17     /**

 18        Constructs a bank account with a given balance.

 19        @param initialBalance the initial balance

 20     */

 21     public BankAccount(double initialBalance)

 22     {   

 23        balance = initialBalance;

 24     }

 25  

 26     /**

 27        Deposits money into the bank account.

 28        @param amount the amount to deposit

 29     */

 30     public void deposit(double amount)

 31     {  

 32        double newBalance = balance + amount;

 33        balance = newBalance;

 34     }

 35  

 36     /**

 37        Withdraws money from the bank account.

 38        @param amount the amount to withdraw

 39     */

 40     public void withdraw(double amount)

 41     {   

 42        double newBalance = balance - amount;

 43        balance = newBalance;

 44     }

 45  

 46     /**

 47        Gets the current balance of the bank account.

 48        @return the current balance

 49     */

 50     public double getBalance()

 51     {   

 52        return balance;

 53     }

 54  }