Chapter 9, Problem 17PE

Program Plan Intro

Implementing BankAccount class

Program plan:

Filename: “BankAccount.java”

This snippet of code is used to implement the class “BankAccount”. In the code,

• Define the class “BankAccount”.
  • Declare the class variable “balance”.
  • Define a constructor “BankAccount()”.
  • Define the method “deposit()”.
    • Add the value of “amount” to the “balance”.
  • Define the method “withdraw()”.
    • Minimize the value of “amount” from the “balance”.
  • Define the abstract method “monthEnd()”.
  • Define the method “getBalance()”.
    • Return the value of “balance”.

Filename: “CheckingAccount.java”

This snippet of code is used to implement the class “CheckingAccount”. In the code,

• Define the class “CheckingAccount” as it inherits class “BankAccount”.
  • Declare the class variable “withdrawals”.
  • Define a constructor “CheckingAccount ()”.
  • Initialize the value of “withdrawals”.
  • Define the method “withdraw()”.
    • Set the value of “FREE_WITHDRAWALS” and “WITHDRAWAL_FEE”.
    • Call the method “withdraw()” of class “BankAccount”.
    • Increment the value of “withdrawals” by 1.
    • If the value of “withdrawals” is greater than “WITHDRAWAL_FEE”,
      • Call the method “withdraw” of class “BankAccount”.
  • Define the abstract method “monthEnd()” of class “BankAccount”.
    • Set the value of “withdrawals” as 0.

Filename: “AccountTester.java”

• Define the class “AccountTester”.
  • Declare the class variable “withdrawals”.
  • Define the method “main()”.
    • Create the object “checking” of the class “CheckingAccount”.
    • Call the method “deposit()”.
    • Call the method “withdraw()”.
    • Call the method “getBalance()” and print the result.
    • Print the expected value.
    • Call the method “deposit()”.
    • Call the method “getBalance()”.
    • Print the expected value.
    • Call the method “withdraw()”.
    • Call the method “getBalance()”.
    • Print the expected value.