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Withdrawal.java
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// Withdrawal.java
// Represents a withdrawal ATM transaction
public class Withdrawal extends Transaction {
private int amount; // amount to withdraw
private Keypad keypad; // reference to keypad
private CashDispenser cashDispenser; // reference to cash dispenser
// constant corresponding to menu option to cancel
private final static int CANCELED = 6;
// Withdrawal constructor
public Withdrawal(int userAccountNumber, Screen atmScreen,
BankDatabase atmBankDatabase, Keypad atmKeypad,
CashDispenser atmCashDispenser) {
// initialize superclass variables
super(userAccountNumber, atmScreen, atmBankDatabase);
// initialize references to keypad and cash dispenser
keypad = atmKeypad;
cashDispenser = atmCashDispenser;
}
// perform transaction
@Override
public void execute() {
boolean cashDispensed = false; // cash was not dispensed yet
double availableBalance; // amount available for withdrawal
// get references to bank database and screen
BankDatabase bankDatabase = getBankDatabase();
Screen screen = getScreen();
// loop until cash is dispensed or the user cancels
do {
// obtain a chosen withdrawal amount from the user
amount = displayMenuOfAmounts();
// check whether user chose a withdrawal amount or canceled
if (amount != CANCELED) {
// get available balance of account involved
availableBalance =
bankDatabase.getAvailableBalance(getAccountNumber());
// check whether the user has enough money in the account
if (amount <= availableBalance) {
// check whether the cash dispenser has enough money
if (cashDispenser.isSufficientCashAvailable(amount)) {
// update the account involved to reflect the withdrawal
bankDatabase.debit(getAccountNumber(), amount);
cashDispenser.dispenseCash(amount); // dispense cash
cashDispensed = true; // cash was dispensed
// instruct user to take cash
screen.displayMessageLine("\nYour cash has been" +
" dispensed. Please take your cash now.");
}
else { // cash dispenser does not have enough cash
screen.displayMessageLine(
"\nInsufficient cash available in the ATM." +
"\n\nPlease choose a smaller amount.");
}
}
else { // not enough money available in user's account
screen.displayMessageLine(
"\nInsufficient funds in your account." +
"\n\nPlease choose a smaller amount.");
}
}
else { // user chose cancel menu option
screen.displayMessageLine("\nCanceling transaction...");
return; // return to main menu because user canceled
}
} while (!cashDispensed);
}
// display a menu of withdrawal amounts and the option to cancel;
// return the chosen amount or 0 if the user chooses to cancel
private int displayMenuOfAmounts() {
int userChoice = 0; // local variable to store return value
Screen screen = getScreen(); // get screen reference
// array of amounts to correspond to menu numbers
int[] amounts = {0, 20, 40, 60, 100, 200};
// loop while no valid choice has been made
while (userChoice == 0) {
// display the withdrawal menu
screen.displayMessageLine("\nWithdrawal Menu:");
screen.displayMessageLine("1 - $20");
screen.displayMessageLine("2 - $40");
screen.displayMessageLine("3 - $60");
screen.displayMessageLine("4 - $100");
screen.displayMessageLine("5 - $200");
screen.displayMessageLine("6 - Cancel transaction");
screen.displayMessage("\nChoose a withdrawal amount: ");
int input = keypad.getInput(); // get user input through keypad
// determine how to proceed based on the input value
switch (input) {
case 1: // if the user chose a withdrawal amount
case 2: // (i.e., chose option 1, 2, 3, 4 or 5), return the
case 3: // corresponding amount from amounts array
case 4:
case 5:
userChoice = amounts[input]; // save user's choice
break;
case CANCELED: // the user chose to cancel
userChoice = CANCELED; // save user's choice
break;
default: // the user did not enter a value from 1-6
screen.displayMessageLine(
"\nInvalid selection. Try again.");
}
}
return userChoice; // return withdrawal amount or CANCELED
}
}
/**************************************************************************
* (C) Copyright 1992-2018 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
*************************************************************************/