Reading text from a file for ATM program

Question

I am working my way through Cay Horstmann's book Big Java early objects, and I am having trouble with the worked example number 12. I want to read information from a text file but the code doesn't seem to work for me. What am I doing wrong?

Here is the code:

package javaprogrammingproject;

import java.io.IOException;
import java.util.Scanner;

/**
 * A text-based simulation of an automatic teller machine.
 */
public class ATMSimulator {

    public static void main(String[] args) {
        ATM theATM;

        try {
            Bank theBank = new Bank();
            theBank.readCustomers("customers.txt");
            theATM = new ATM(theBank);
        } catch (IOException e) {
            System.out.println("Error opening accounts file.");
            return;
        }

        Scanner in = new Scanner(System.in);

        while (true) {
            int state = theATM.getState();

            if (state == ATM.START) {
                System.out.print("Enter customer number: ");
                int number = in.nextInt();
                theATM.setCustomerNumber(number);
            } else if (state == ATM.PIN) {
                System.out.print("Enter PIN: ");
                int pin = in.nextInt();
                theATM.selectCustomer(pin);
            } else if (state == ATM.ACCOUNT) {
                System.out.print("A=Checking, B=Savings, C=Quit: ");
                String command = in.next();

                if (command.equalsIgnoreCase("A")) {
                    theATM.selectAccount(ATM.CHECKING);
                } else if (command.equalsIgnoreCase("B")) {
                    theATM.selectAccount(ATM.SAVINGS);
                } else if (command.equalsIgnoreCase("C")) {
                    theATM.reset();
                } else {
                    System.out.println("Illegal input!");
                }
            } else if (state == ATM.TRANSACT) {
                System.out.println("Balance=" + theATM.getBalance());
                System.out.print("A=Deposit, B=Withdrawal, C=Cancel: ");
                String command = in.next();

                if (command.equalsIgnoreCase("A")) {
                    System.out.print("Amount: ");
                    double amount = in.nextDouble();
                    theATM.deposit(amount);
                    theATM.Back();
                } else if (command.equalsIgnoreCase("B")) {
                    System.out.print("Amount: ");
                    double amount = in.nextDouble();
                    theATM.withdraw(amount);
                    theATM.Back();
                } else if (command.equalsIgnoreCase("C")) {
                    theATM.Back();
                } else {
                    System.out.println("Illegal input!");
                }
            }
        }
    }
}

Also here is the code for the method:

public void readCustomers(String filename) throws IOException {
    Scanner in = new Scanner(new File(filename));

    while (in.hasNext()) {
        int number = in.nextInt();
        int pin = in.nextInt();
        Customer c = new Customer(number, pin);
        addCustomer(c);
    }

    in.close();
}

And this is what is in the text file:

1 1234 0 1
2 2468 0 1
3 3692 2 3
4 4826 4 3
5 5050 5 6
6 6284 5 7
7 7418 5 8
8 8642 9 10
9 9876 11 12

Any help is appreciated thanks!

Answer 1

In file, what are columns 3 and 4th for? when you do in.nextInt() in 2nd iteration of while loop you will get 0/1 and not 2/2468 which you are expecting to create customer object. either read file line by line or skip 2 integers to create next customer