Chapter 9, Problem 9PE

Program Plan Intro

Basic Account to deposit and withdraw amount

Program plan:

Filename: “BankAccount.java”

This program file is used to define a class “BankAccount”. In the code,

• Define a class “BankAccount”.
  • Declare a class variable “balance”.
  • Define a constructor “BankAccount()”.
    • Initialize the “balance” as 0
  • Define a constructor “BankAccount()”.
    • Set the value of “balance”.
  • Define a method “deposit()”.
    • Set the value of “newBalance”.
    • Set the value of “balance”.
  • Define a method “withdraw()”.
    • Set the value of “newBalance”.
    • Set the value of “balance”.
  • Define a method “getBalance()”.
    • Return the value of “balance”.

Filename: “BasicAccount.java”

This program file is used to define a class “BasicAccount” as extending from “BankAccount”. In the code,

• Define a class “BasicAccount”.
  • Define a constructor “BasicAccount()”.
    • Call the method “super()”.
  • Define a method “withdraw()”.
    • If the condition “getBalance()-amount<0” is true,
      • Add 30 to “amount”.
        • Invoke “withdraw()”.

Filename: “BasicAccountTester.java”

This program file is used to define a class “BasicAccountTester” to test the class “BasicAccount”. In the code,

• Define a class “BasicAccountTester”.
  • Define a method “main()”.
  • Declare an object of “BasicAccount()”.
  • Call the method “withdraw()”.
  • Call the method “getBalance()” and print the value.
  • Print the expected value.
  • Call the method “withdraw()”.
  • Call the method “getBalance()” and print the value.
  • Print the expected value.
  • Call the method “withdraw()”.
  • Call the method “getBalance()” and print the value.
  • Print the expected value.