import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;

public class TomtVindu {
    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel(
                UIManager.getCrossPlatformLookAndFeelClassName());
        } catch (Exception e) {
            System.exit(1);
        }

        JFrame vindu = new JFrame("Mitt Program");
        vindu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        vindu.add(panel);

        vindu.pack();
        vindu.setVisible(true);

    }
}