This project involves writing a program that implements an ATM machine. The inte

Question

This project involves writing a program that implements an ATM machine. The interface to the program should be a Java GUI that looks similar to the following: The program should consist of three classes.

1. The first class should define the GUI. In addition to the main method and a constructor to build the GUI, event handlers will be needed to handle each of the four buttons shown above. When the Withdraw button is clicked, several checks must be made. The first check is to ensure the value in the text field is numeric. Next a check must be made to ensure the amount is in increments of $20. At that point an attempt to withdraw the funds is made from the account selected by the radio buttons. The attempt might result in an exception being thrown for insufficient funds, If any of those three errors occur a JOptionPane window should be displayed explaining the error. Otherwise a window should be displayed confirming that the withdrawal has succeeded. When the Deposit button is clicked the only necessary check is to ensure that the amount input in the textfield is numeric. Clicking the Transfer button signifies transferring funds to the selected account from the other account. The checks needed are to confirm that the amount supplied is numeric and that there are sufficient funds in the account from which the funds are being transferred. Clicking the Balance button will cause a JOptionPane window to be displayed showing the current balance in the selected account. The main class must contain two Account objects, one for the checking account and another for the savings account.

2. The second class is Account. It must have a constructor plus a method that corresponds to each of the four buttons in the GUI. It must also incorporate logic to deduct a service charge of $1.50 when more than four total withdrawals are made from either account. Note that this means, for example, if two withdrawals are made from the checking and two from the savings, any withdrawal from either account thereafter incurs the service charge. The method that performs the withdrawals must throw an InsufficientFunds exception whenever an attempt is made to withdraw more funds than are available in the 2 account. Note that when service charges apply, there must also be sufficient funds to pay for that charge.

3. The third class is InsufficientFunds, which is a user defined checked exception.

Explanation / Answer

import java.util.ArrayList; import java.util.Scanner; public class BankMain { private double availableBal =80; private double totalBal =100; static ArrayList cardNum = new ArrayList(); static Scanner input = new Scanner(System.in); private String error; //String the error from the exception { error = "error"; } public static void cardNumbers(){ Scanner input = new Scanner(System.in); try{ System.out.println("Please select a 5 digit card number"); int num = input.nextInt(); checkNumber(num); } catch(invalidNumber err){ System.out.println("Caught Error: " + err.getError()); contC(); } } public static void contC(){ Scanner keyboard = new Scanner(System.in); System.out.println("Type 'c' to enter number again."); String value = keyboard.next(); if(value.equalsIgnoreCase("c")){ cardNumbers(); } else if (!keyboard.equals('c')){ System.out.println("Invalid Entry!"); } } public static void menu(){ System.out.println("ATM Menu:"); System.out.println(); System.out.println("1 = Create Account"); System.out.println("2 = Account Login"); System.out.println("3 = Exit ATM"); query(); } public void startAtm() { menu(); } public void drawMainMenu() { AccountMain main3 = new AccountMain(); int selection; System.out.println(" ATM main menu:"); System.out.println("1 - View account balance"); System.out.println("2 - Withdraw funds"); System.out.println("3 - Add funds"); System.out.println("4 - Back to Account Menu"); System.out.println("5 - Terminate transaction"); System.out.print("Choice: "); selection = input.nextInt(); switch(selection) { case 1: viewAccountInfo(); break; case 2: withdraw(); break; case 3: addFunds(); break; case 4: AccountMain.selectAccount(); break; case 5: System.out.println("Thank you for using this ATM!!! goodbye"); } } public void viewAccountInfo() { System.out.println("Account Information:"); System.out.println(" --Total balance: $"+totalBal); System.out.println(" --Available balance: $"+availableBal); drawMainMenu(); } public void deposit(int depAmount) { System.out.println(" ***Please insert your money now...***"); totalBal =totalBal +depAmount; availableBal =availableBal +depAmount; } public void checkNsf(int withdrawAmount) { if(totalBal -withdrawAmount < 0) System.out.println(" ***ERROR!!! Insufficient funds in you accout***"); else { totalBal =totalBal -withdrawAmount; availableBal =availableBal -withdrawAmount; System.out.println(" ***Please take your money now...***"); } } public void addFunds() { int addSelection; System.out.println("Deposit funds:"); System.out.println("1 - $20"); System.out.println("2 - $40"); System.out.println("3 - $60"); System.out.println("4 - $100"); System.out.println("5 - Back to main menu"); System.out.print("Choice: "); addSelection =input.nextInt(); switch(addSelection) { case 1: deposit(20); drawMainMenu(); break; case 2: deposit(40); drawMainMenu(); break; case 3: deposit(60); drawMainMenu(); break; case 4: deposit(100); drawMainMenu(); break; case 5: drawMainMenu(); break; } } public void withdraw() { try{ int withdrawSelection; System.out.println("Withdraw money:"); System.out.println("1 - $20"); System.out.println("2 - $40"); System.out.println("3 - $60"); System.out.println("4 - $100"); System.out.println("5 - Back to main menu"); System.out.print("Choice: "); withdrawSelection =input.nextInt(); switch(withdrawSelection) { case 1: checkAmount(20); drawMainMenu(); break; case 2: checkAmount(40); drawMainMenu(); break; case 3: checkAmount(60); drawMainMenu(); break; case 4: checkAmount(100); drawMainMenu(); break; case 5: drawMainMenu(); break; default: System.out.println("Invalid choice."); withdraw(); } } catch(invalidAmount err){ System.out.println("Caught Error: " + err.getError()); viewAccountInfo(); } } public static void query(){ Scanner keyboard = new Scanner(System.in); while (!keyboard.hasNextInt()) { System.out.println("Invalid choice."); menu(); } int input = keyboard.nextInt(); if (input == 2){ BankMainPart2 main2 = new BankMainPart2(); System.out.println("Please enter your 5 digit card number."); BankMainPart2.loginCard(cardNum); } else if (input == 1){ cardNumbers(); } else if (input == 3){ System.out.println("Thank you, have a nice day!"); System.exit(0); } } private static void checkNumber(int num) throws invalidNumber //run the check activation exception { Scanner keyboard = new Scanner(System.in); if(String.valueOf(num).length()!=5) { throw new invalidNumber("invalid number"); } else { cardNum.add(num); System.out.println("Thank you! You're card number is " +num); contC2(); } } private void checkAmount(int withdrawAmount) throws invalidAmount //run the check activation exception { if(totalBal -withdrawAmount < 0) { throw new invalidAmount(" ***ERROR!!! Insufficient funds in you accout***"); } else { totalBal =totalBal -withdrawAmount; availableBal =availableBal -withdrawAmount; System.out.println(" ***Please take your money now...***"); } } public static void contC2(){ Scanner keyboard = new Scanner(System.in); System.out.println("Type 'c' to return to main menu."); String value = keyboard.next(); if(value.equalsIgnoreCase("c")){ menu(); } else if (!keyboard.equals('c')){ System.out.println("Invalid Entry!"); contC2(); } } public static void main(String args[]) { BankMain myAtm = new BankMain(); BankMainSub sub = new BankMainSub(); myAtm.startAtm(); } }

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