Chapter 22, Problem 3PE

Program Plan Intro

Display the total number of client logged in

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,
      • 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 by calling the “executeCommand ()” method
    • Define the “executeCommand ()” method
      • 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
              • Return the value
            • Print the balance

Filename: “AdministrationService.java”

• Include the required header files
• Define the “AdministrationService” class
  • 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 by calling the “executeCommand ()” method
  • Define the “executeCommand ()” method
    • Check the “command” is equal to “LOGIN”
      • Get the password
      • Check the password
        • If the password is wrong, then display incorrect message
        • Otherwise, print successful message
    • Check “loggedIn” is no true
      • Print the statement
    • Check the “command” is equal to “STATUS”
      • Print the client served
    • Check the “command” is equal to “PASSWORD”
      • Get the new password
      • Call the “changePassword” method
      • Set the new password to the password variable
      • Print password changed
    • Check the “command” is equal to “SHUTDOWN”
      • Print the shutdown message
    • Otherwise, print the invalid command.

Filename: “AdminData.java”

• Include the required header files
• Define the “AdminData” class
  • Declare the required variables
  • Define the “incrementCustomerCount ()” method
    • Increment the value
  • Define the “getCustomerCount ()”
    • Return count
  • Define the “checkPassword ()” method
    • Return the password
  • Define the “changePassword ()” method
    • Check the password
      • Set the value