Chapter 3, Problem 22RE

Explanation of Solution

Modification of “BankAccount” class:

• The modification of “BankAccount” class can be done by adding new instance variable for monitorin...

Explanation of Solution

Method for deducting the fee:

• The “calculateTransFee()” method is defined to add the instance variable.
• An instance variable is added to calculate, deduct the fee and reset the variable “numOfTransactions” as zero.

//Define void method

public void calculateTransFee()

{

    //Check for transactions

   �...

Explanation of Solution

Additional instance variables:

• The instance variable required is “numOfTransactions”.
• The variable “numOfTransactions” is incremented by one value inside “withdraw()” and “deposit()” methods.
• The statement used for deducting the fee at the end of month is as follows,

  //Required method

numOfTransactions++;

• Here, the variable is initialized as zero inside the constructors.

An instance variable is added to calculate, deduct the fee and reset the variable “numOfTransactions” as zero in the “calculateTransFee()” method...

Explanation of Solution

Tracing the code:

Let us assume the following method calls for tracing the object code.

//Declare the balance in account

BankAccount harryAccount(1000);

//Deposit the required amount

harryAccount.deposit(50);

harryAccount.deposit(500);

harryAccount.deposit(250);

//Withdraw the required amount

harryAccount.withdraw(100);

//Deposit the required amount

harryAccount.deposit(70);

harryAccount.deposit(80);

//Calculate the balance

harryAccount...