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

class GUIEksempel {
    static int count = 0;
    public static void main(String[] args) {
        JFrame vindu = new JFrame("Vindu-tekst");
        vindu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        vindu.setPreferredSize(new Dimension(500, 300));

        try {
            UIManager.setLookAndFeel(
                UIManager.getCrossPlatformLookAndFeelClassName()
            );
        } catch (Exception e) {
            System.exit(1);
        }

        

        JPanel panel = new JPanel();
        JLabel tekst = new JLabel("Telling: " + count);
        JButton knapp = new JButton("?k teller");
        knapp.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                count++;
                tekst.setText("Telling: " + count);
            }
        });

        panel.add(tekst);
        panel.add(knapp);
        
        vindu.add(panel);

        vindu.pack();
        vindu.setLocationRelativeTo(null);
        vindu.setVisible(true);
    }
}