setLookAndFeel problem

Hi,
im testing a simple code for an ActionLIstener event for a button.
the expected outcome with the functionality of the button is ok.
but i couldn't set the *theme* get displayed.
i.e. the method calling lookAndFeel() does not seems to work.
any help would be greately appreciable.

thank you very much

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

public class AL extends Frame implements WindowListener,ActionListener
{

    TextField text = new TextField(20);
    Button b;
    private int numClicks = 0;

    public static void main(String[] args) {

        AL myWindow = new AL("My first window");
        myWindow.setSize(350,100);
        myWindow.setVisible(true);
    }

    public AL(String title) {

        super(title);
        setLayout(new FlowLayout());
        addWindowListener(this);
        lookAndFeel();

        b = new Button("Click me");
        add(b);
        add(text);
        b.addActionListener(this);
    }

    public void lookAndFeel(){
        try{
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        SwingUtilities.updateComponentTreeUI(this);
        }catch(Exception e){
            System.out.println("errr");
        }
    }

    public void actionPerformed(ActionEvent e) {
        numClicks++;
        text.setText("Button Clicked " + numClicks + " times");

    }

    public void windowClosing(WindowEvent e) {
        dispose();
        System.exit(0);
    }

    public void windowOpened(WindowEvent e) {}
    public void windowActivated(WindowEvent e) {}
    public void windowIconified(WindowEvent e) {}
    public void windowDeiconified(WindowEvent e) {}
    public void windowDeactivated(WindowEvent e) {}
    public void windowClosed(WindowEvent e) {}

}