You are to program a virtual ATM machine using Java. The client wants a GUI for

Question

You are to program a virtual ATM machine using Java. The client wants a GUI for its virtual ATM. The program will allow a user to enter their personal pin number (only 4 numbers allowed from 0001 to 9999). The user then must choose which account they would like to make a transaction: Savings Account or Checking Account, or Loan Payment (such as a mortgage, a car loan, or a student loan). If the user chooses a savngs account, then the allowed transactions are either to add money to the saving account, or to withdraw money from the savings account. A balance must be given to the user at the end of the transaction. Assume that the user has a starting balance of $4000 in each of their checking and savings accounts. Error trapping: if a balance goes below $200, then an alert to the user will be issued. For the loan payments, the user is to choose whether the loan is for a mortgage, a student loan, an auto loan, or a personal loan. For Mortgage: assume $350,000 balance and payment of $3500 per month; For Student Loan: assume $75,000 balance and payment of $250 per month; For Auto Loan, assume $35,000 balance and payment of $500 per month; For Personal Loan, assume $5,000 and payment of $1000 per month. Test data: for savings account in order: deposit $2000, deposit $1500, withdraw $2500, final balance Test data for checking account in order: checks (in order) made in the amount of $120, $40, $700, $50, $1000, final balance. Test data for loan payment(s): see above and provide for at least two payments.

Explanation / Answer

mport java.util.ArrayList;
import java.util.Scanner;

public class BankMain
{
private double availableBal =80;
private double totalBal =100;

static ArrayList<Integer> cardNum = new ArrayList<Integer>();
static Scanner input = new Scanner(System.in);

private String error;   
{
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
{
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
{
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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