1) What is 1+2 = ...?
a) 2
b) 3
c) 0
d) 1
b
...

import java.io.File;
import java.util.Scanner;
import javax.swing.JOptionPane;

public class GameQuiz
{
    public static void main(String[] args) {
        String[] data = new String[120];
        String question = "";
        int count = 0;
        try{
            Scanner inFile = new Scanner(new File("questions.txt"));
            while (inFile.hasNext()){
                data[count] = inFile.nextLine();
                count++;
            }
            inFile.close();
        }catch(Exception e){
            e.printStackTrace();
        }

        int choice = 0, numCorrect = 0, i = 0;
        char correctAnswer = ' ', correct = ' ';
        String answer= "";
        String answerChoices[] = {"a", "b", "c", "d"};
        for (int j = 0; j < 20; j++)
        {
            answer = "";
            for (i = 0; i < 5; i++)
            {
                answer += data[i+(j*6)] + "n";
            }
            correctAnswer = data[i+(j*6)].charAt(0);

            choice = JOptionPane.showOptionDialog(null, answer, "Quiz Game",
                    0, 3, null, answerChoices, null);


            if (choice == 0) correct = 'a';
            if (choice == 1) correct = 'b';
            if (choice == 2) correct = 'c';
            if (choice == 3) correct = 'd';

            if (correct == correctAnswer)
            {
                numCorrect ++;
                JOptionPane.showMessageDialog(null, "Correct!");
            }
            else JOptionPane.showMessageDialog(null, "Sorry.n"+
                    "The correct answer was "+correctAnswer);
        }
        JOptionPane.showMessageDialog(null, "You have "+numCorrect+"/20 correct answers.");
    }
}