[hardwired]

Without seeing the file you are trying to read I have no idea what might be going awry. How your files are written and how you attempt to read them plays a big part in what you get from the readFiles method. I made up a text file with ten lines in it and read it for the plate tectonics quiz. Typing in the answers from the AnswerStore.answers string array worked okay.

Code:

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.io.*;
import javax.swing.*;

public class GQ extends JFrame implements ActionListener {
    private static final int FRAME_WIDTH = 140;
    private static final int FRAME_HEIGHT = 160;
    private static final int FRAME_X_ORIGIN = 70;
    private static final int FRAME_Y_ORIGIN = 50;
    AnswerStore answerStore = new AnswerStore();

    public static void main (String[] args) {
        JOptionPane.showMessageDialog(null, "This is a Geography Quiz");
        JOptionPane.showMessageDialog(null, "Good Luck");

        String passString = JOptionPane.showInputDialog("Enter the Password");

        //Password = passString.nextInt();
        int Password = Integer.parseInt(passString.trim());

        if (Password == 123) {
            JOptionPane.showMessageDialog(null, "Valid. You typed the right password. " +
                                          "Now choose from the following menu");

            GQ frame = new GQ();
            frame.setVisible(true);
        } else {
            JOptionPane.showMessageDialog(null, "Invalid Password. Try Again");
        }
    }

    public GQ() {
        Container contentPane;
        JButton button1, button2, button3, button4, button5;

        setSize (FRAME_WIDTH, FRAME_HEIGHT);
        setTitle("Geography Quiz");
        setLocation(FRAME_X_ORIGIN, FRAME_Y_ORIGIN);

        contentPane = getContentPane();
        contentPane.setBackground(Color.pink);
        contentPane.setLayout(new FlowLayout());

        button1 = new JButton("Plate Tectonics");
        button2 = new JButton("Rivers");
        button3 = new JButton("Rocks");
        button4 = new JButton("Quit");

        contentPane.add(button1);
        contentPane.add(button2);
        contentPane.add(button3);
        contentPane.add(button4);
    
        button1.addActionListener(this);
        button1.setActionCommand("b1");
        button2.addActionListener(this);
        button2.setActionCommand("b2");
        button3.addActionListener(this);
        button3.setActionCommand("b3");
        button4.addActionListener(this);
        button4.setActionCommand("b4");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }
  
    public void actionPerformed(ActionEvent e) {
        String ac = e.getActionCommand();
        String[] questions = null;
        if (ac.equals("b1")) {
            questions = readFile("plate_tectonics.txt");
        } else if(ac.equals("b2")) {
            questions = readFile("rivers.txt");
        } else if(ac.equals("b3")) {
            questions = readFile("rocks.txt");
        } else if (ac.equals("b4")) {
            System.exit(0);
        }
        askQuestions(questions);
    }

    private String[] readFile(String path) {
        Scanner s = null;
        StringBuilder sb = new StringBuilder();
        String separator = "\n";
        try {
            s = new Scanner(new BufferedReader(new FileReader(path)));
//            s.useDelimiter(",\\s*");
            while (s.hasNext()) {
                sb.append(s.nextLine() + separator);
//                JOptionPane.showMessageDialog(null,s.next());
            }
        } catch(IOException e) {
            System.out.println("read error: " + e.getMessage());
        } finally {
            if (s != null) 
                s.close();
//            break;
        }
        // What did we get?
        System.out.println("sb = " + sb.toString());
        System.out.printf("sb.split = %s%n", Arrays.toString(sb.toString().split("\\n")));
        return sb.toString().split("\\n");
    }

    private void askQuestions(String[] questions) {
        System.out.printf("questions = %s%n", Arrays.toString(questions));
        int count = 0;
        for(int j = 0; j < questions.length; j++) {
             String input = JOptionPane.showInputDialog(null, questions[j]);
             if(answerStore.answers[j].equals(input))
                 count++;
        }
        JOptionPane.showMessageDialog(null, "You answered " + count +
                                      " out of " + questions.length +
                                      " questions correctly.");
    }
}

class AnswerStore  {
    String[] answers = {
        "Hellenic", "constructive", "100km", "Italy", "Wegner",
        "constructive", "100km", "Italy", "destroyed", "Mediterranean"
    };
}

plate_tectonics.txt

Code:

Question 1
Question 2
Question 3
Question 4
Question 5
Question 6
Question 7
Question 8
Question 9
Question 10