Big Java Late Objects
Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
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Chapter 22, Problem 4PE
Program Plan Intro

Error checking

Program plan:

Filename: “BankAccount.java”

  • Include the header files in the program
  • Define the “BankService” class
    • Declare the required variables
    • Define the constructor
      • Set the values
    • Define the parameterized constructor
      • Set the value
    • Define the “deposit” method
      • Call the method
      • In “try” block,
        • Calculate the new balance
        • Set the balance
          • In finally block, call the method
    • Define the “withdraw” method
      • Call the method
      • In “try” block,
        • Check the “amount” is greater than “balance”
          • Throw “InsufficientFundsException” exception
        • Check the “amount” is less than 0
          • Throw “InsufficientFundsException” exception
          • Calculate the new balance
          • Set the balance
            • In finally block, call the method
    • Define “getBalance ()” method
      • Return the balance

Filename: “BankService.java”

  • Include the required header files
  • Define the class “BankService”
    • Define the “main” method
      • Declare the required variables.
      • Define the constructor
        • Set the values
      • Define the “run ()” method
        • In try block,
          • Create the objects for “Scanner” and “PrintWriter” class in another “try” block.
            • Call “doService()” method
          • Finally, close the connection
              • In catch block, throw an exception
      • Define the “doService ()” method
        • Execute all command until the QUIT command or the end of input
        • Declare the string variable
        • In “try” block,
          • Call the “executeCommand ()” method and store the result in “response” variable
              • In “catch” block, throw “InsufficientFundsException”, “InvalidCommandException”, and “NoSuchAccountException”.
              • Print the response
      • Define the “executeCommand ()” method
        • Check the condition
          • Throw “InvalidCommandException”
              • Get the account number
              • Check “command” is equal to “DEPOSIT”
                • Get the amount
                • Call “deposit ()” method in “Bank” class
              • Check “command” is equal to “WITHDRAW”
                • Get the amount
                • Call “withdraw ()” method in “Bank” class.
              • Check “command” is equal to “BALANCE”
                • Print the invalid message
                • Call the “getBalance” method and store the result
                • Return the value
              • Print the balance

Filename: “InsufficientFundsException.java”

  • Define the “InsufficientFundsException” class
    • Define the constructor
      • Call the “super” method

Filename: “InvalidCommandException.java”

  • Define the “InvalidCommandException” class
    • Define the constructor
      • Call the “super” method

Filename: “NoSuchAccountException.java”

  • Define the “NoSuchAccountException” class
    • Define the constructor
      • Call the “super” method

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