import java.io.*;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Scanner;
    import javax.swing.JOptionPane;

        public class Test {
        public static void main(String[] args) throws InterruptedException {

        // Location of file to read
        File file = new File("a.txt");
        List<String> lines = new ArrayList<String>();

        try {

            Scanner scanner = new Scanner(file);

            while (scanner.hasNextLine()) {
                lines.add(scanner.nextLine());
            }
            scanner.close();
            for (int i=1 ; i < lines.size(); i+=2)
            {
                String question = lines.get(i - 1);
                String answer=lines.get(i += 1);
                String a = JOptionPane.showInputDialog("" + question);
                if (a.equals(answer)){
                    Thread.sleep(10000);
                }else
                    JOptionPane.showMessageDialog(null,"Please look it up");
            }
        } catch (FileNotFoundException e) {
         System.out.println("Can't find file");
        }
    }
}