Java Finished!

//Name: Rob H
//Date: 05/03/2011
//Desc: FINAL

import java.text.DateFormat;
import java.text.SimpleDateFormat;  //remove? no, bugs out.
import java.util.*;
import javax.swing.*;


public class AtmHerman
{
    public static void main(String[] args)
    {
        int cleared = 0;

        //Have to use two arrays for this.
        int[] acc = {0,11112222, 22223333, 33334444};
        int[] pin = {0,1111, 2222, 3333};

        //Information on accounts
        String[] name = {"0", "Curly Brace", "Adam Sandler", "Kvothe"};
        double[] balance = {0, 100.01, 200.02, 300.03};

        //Ask user for account num "insert card"
        String input1 = JOptionPane.showInputDialog("Please insert card (8 numbers): ");
        int convert1 = Integer.parseInt(input1);

        //Now that we have a number, compare it to acc[]
        int position = 0;
        for (int i = 0; i < 4; i++)
        {
            if (convert1 == acc[i])
            {
                position = i;
            }
            else
            {
                //nothing
            }
        }

        //If position = 0, end program.
        if (position == 0)
        {
            System.out.println("Account number invalid.  Please contact your bank.");
            System.exit(0);
        }

        //Ask for pin.
        String input2 = JOptionPane.showInputDialog("Please enter pin (4 numbers): ");
        int convert2 = Integer.parseInt(input2);

        //Loop.  If it fails, close the program.
        int Three_Strikes = 0;
        for (int lol = 0; cleared < 1; lol++)
        {
            if (convert2 == pin[position])
            {
                cleared = 1;
            }
            else
            {
                Three_Strikes = Three_Strikes + 1;

                if (Three_Strikes == 3)
                {
                    System.exit(0);
                }
                input2=JOptionPane.showInputDialog("PIN does not match.  Please try again.");
                convert2 = Integer.parseInt(input2);
            }
        }


        int c = pin[position];
        int d = acc[position];

        //Create the object
        CheckingAccountCustomer cust = new CheckingAccountCustomer(name[position], c, balance[position], d);

        //interface
        String loop = "";
        while (loop != "Q")
        {
            //Greet, give name and date.  What do you want to do?  Take input here.
            loop = JOptionPane.showInputDialog(AtmHerman.getDateTime() + "\nWelcome " + cust.getName() + ".\n(D)eposit Money\n(W)ithdraw Money\n(C)heck Account Balance\n(Q)uit");
            loop = loop.toUpperCase();
            if (loop.equals("D"))
            {
                cust.deposit();
            }
            else if (loop.equals("W"))
            {
                cust.withdraw();
            }
            else if (loop.equals("C"))
            {
                cust.checkBalance();
            }
            else if (loop.equals("Q"))
            {
                System.out.println("Goodbye!");
                cust.quit();
            }    //Exit the program.
            else
                System.out.println("Input Error");
        }
    }

    //Date and time.
    private static String getDateTime()
    {
        Calendar cal = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_NOW);
        return sdf.format(cal.getTime());
   }
        private static final String DATE_FORMAT_NOW = "yyyy-MM-dd HH:mm";
}


abstract class Customer
{
    //Declare variables.
    String name = "";
    int pin = 0;
    double balance = 0.0;
    //Constructor
    Customer(String n, int p, double b) // no access modifiers, because the desired protection level is between protected and private: thus, the default 'package private'
    {
        name = n;
        pin = p;
        balance = b;
    }

     Customer()
    {
        name = "";
        pin = 0;
        balance = 0.0;
    }

    //Accessors
     String getName()
    {
        return name;
    }
     int getPin()
    {
        return pin;
    }
     double getBalance()
    {
        return balance;
    }

    //These don't do anything until they get inherited.
    abstract void deposit(); // no access modifiers, because the desired protection level is between protected and private: thus, the default 'package private'

    abstract void withdraw();

    abstract void checkBalance();

    abstract void quit();

}

class CheckingAccountCustomer extends Customer
{
    int accountNo = 0;

    //Constructor
    CheckingAccountCustomer(String n, int p, double b, int a)// no access modifiers, because the desired protection level is between protected and private: thus, the default 'package private'
    {
        super(n, p, b);
        accountNo = a;
    }

    void deposit()
    {
        String input3 = JOptionPane.showInputDialog("How much are you depositing?  ");
        double convert3 = Double.parseDouble(input3);
        if (convert3 > 0)
        {
            balance = balance + convert3;
            System.out.println("As of " + CheckingAccountCustomer.getDateTime() + " your balance is " + balance);
        }
        else
        {
            System.out.println("Invalid entry");
        }
    }

    void withdraw()
    {
        String input4 = JOptionPane.showInputDialog("How much are you withdrawing?  ");
        double convert4 = Double.parseDouble(input4);
        if(convert4 > 0)
        {
            balance = balance - convert4;
            if(balance < 0)
            {
                balance = balance + convert4;
                System.out.println("Insufficient funds.");
            }
            else
            {
                System.out.println("As of " + CheckingAccountCustomer.getDateTime() + " your balance is " + balance);
            }
        }
        else
        {
            System.out.println("Invalid entry");
        }
    }

    void checkBalance()
    {
        System.out.println("As of " + CheckingAccountCustomer.getDateTime() + " your balance is " + balance);
    }

    void quit()
    {
        System.exit(0);
    }

        //Date and time.
    private static String getDateTime()
    {
        Calendar cal = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_NOW);
        return sdf.format(cal.getTime());
   }
        private static final String DATE_FORMAT_NOW = "yyyy-MM-dd HH:mm";
}