Method doesn't perform

[Michail]

Hi all,

i tried to make an application, which would simplify the proces of learning words.. I'm dutch, so I sometimes have to learn translations from english to dutch and viceversa.

This is my application. I got rid of the compiling-errors, but the method setQuestion doesn't perform (see the picture).

Who can help?

class Main {
	public static void main(String[] arg) {
		Words words = new Words ();
		words.setQuestion();
	}
}

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

public class Words extends JFrame implements ActionListener {
	private JTextField tfanswer;
	private JLabel lquestion;
	private JLabel lempty;
	private JLabel lanswer;
	private JButton bsubmit;
	private JButton bnext;
	private JButton bstop;
	private Random r = new Random();
	private int i;

	public Words() {
		//Making the textfields, labels and buttons
		tfanswer = new JTextField(20);
		lquestion = new JLabel("", JLabel.CENTER);
		lempty = new JLabel("", JLabel.CENTER);
		lanswer = new JLabel("", JLabel.CENTER);
		bsubmit = new JButton("Submit");
		bnext = new JButton("Next");
		bstop = new JButton("Stop");
		bnext.addActionListener(this);
		bsubmit.addActionListener(this);
		bstop.addActionListener(this);


		JPanel p1 = new JPanel();
		p1.setLayout(new GridLayout(2, 2));
		p1.add(lquestion);
		p1.add(tfanswer);
		p1.add(lempty);
		p1.add(lanswer);

		JPanel p2 = new JPanel();
		p2.add(bsubmit);
		p2.add(bnext);
		p2.add(bstop);

		Container c = getContentPane();
			c.add(p1, BorderLayout.CENTER);
			c.add(p2, BorderLayout.SOUTH);
			setTitle("Learning Words");
			setSize(400,150);
			setVisible(true);
			setDefaultCloseOperation(EXIT_ON_CLOSE);
	}

	String[] question = {
		"question1",
		"question2",
		"question3",
	};

	String[] answer = {
		"answer1",
		"answer2",
		"answer3"
	};

	public void setQuestion() {
		lquestion.setText(question[0]);
	}

	public void nextQuestion() {
		i = r.nextInt(3);
		lquestion.setText(question[i]);
	}

	public void actionPerformed(ActionEvent e) {
		if (e.getActionCommand().equals("Submit")) {

			String temp = tfanswer.getText();

			if (temp.equals(answer[i])) {
				lanswer.setText("Correct!");
			}
			else {
				lanswer.setText("Wrong, the answer is " + answer[0]);
			}
		}
		else if (e.getActionCommand().equals("Next")) {
		  this.nextQuestion();
		}
		else if (e.getActionCommand().equals("Stop")) {
			System.exit(0);
		}
	}
}