lookandfeel() cannot be applied to JFrame?

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

Code :

[FONT=Courier, Monospaced]import java.awt.*; 
 import java.awt.event.*; 
 import javax.swing.SwingUtilities; 
 import javax.swing.UIManager; 
 [/FONT]
[FONT=Courier, Monospaced]public class AL extends Frame implements WindowListener,ActionListener 
 { 
 [/FONT]
[FONT=Courier, Monospaced]        TextField text = new TextField(20); 
         Button b; 
         private int numClicks = 0; 
 [/FONT]
[FONT=Courier, Monospaced]        public static void main(String[] args) { 
 [/FONT]
[FONT=Courier, Monospaced]                AL myWindow = new AL("My first window"); 
                 myWindow.setSize(350,100); 
                 myWindow.setVisible(true); 
         } 
 [/FONT]
[FONT=Courier, Monospaced]        public AL(String title) { 
 [/FONT]
[FONT=Courier, Monospaced]                super(title); 
                 setLayout(new FlowLayout()); 
                 addWindowListener(this); 
         lookAndFeel(); 
 [/FONT]
[FONT=Courier, Monospaced]                b = new Button("Click me"); 
                 add(b); 
                 add(text); 
                 b.addActionListener(this); 
         } 
 [/FONT]
[FONT=Courier, Monospaced]    public void lookAndFeel(){ 
                 try{ 
                 UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
                 SwingUtilities.updateComponentTreeUI(this); 
                 }catch(Exception e){ 
                         System.out.println("errr"); 
                 } 
         } 
 [/FONT]
[FONT=Courier, Monospaced]        public void actionPerformed(ActionEvent e) { 
                 numClicks++; 
                 text.setText("Button Clicked " + numClicks + " times"); 
 [/FONT]
[FONT=Courier, Monospaced]        } 
 [/FONT]
[FONT=Courier, Monospaced]        public void windowClosing(WindowEvent e) { 
                 dispose(); 
                 System.exit(0); 
         } 
 [/FONT]
[FONT=Courier, Monospaced]        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) {} [/FONT]

i heard that lookandfeel() cannot be applied to JFrame. but for the below program the lookandfeel() works well. :confused:

Code :

[FONT=Courier, Monospaced]import javax.swing.*; 
 import java.awt.*; 
 /** 
  * 
  * @author arshad 
  */ 
 public class ProgressMonitor extends JFrame{ 
 [/FONT]
[FONT=Courier, Monospaced]    JProgressBar current; 
     JTextArea out; 
     JButton find; 
     Thread runner; 
     int num=0; 
 [/FONT]
[FONT=Courier, Monospaced]    public ProgressMonitor() { 
 [/FONT]
[FONT=Courier, Monospaced]        super("Progress Monitor"); 
         Dimension 
 d=java.awt.Toolkit.getDefaultToolkit().getScreenSize(); 
         setSize(d); 
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
         setLookAndFeel(); 
 [/FONT]
[FONT=Courier, Monospaced]//        setSize(205,68); 
         setLayout(new FlowLayout()); 
         current=new JProgressBar(0,2000); 
         current.setValue(0); 
         current.setStringPainted(true); 
         JLabel label=new JLabel("You have been fooled!, Your machine 
 is being formatted"); 
         JPanel panel=new JPanel(); 
 [/FONT]
[FONT=Courier, Monospaced]//        panel.add(sld); 
 [/FONT]
[FONT=Courier, Monospaced]        panel.add(label); 
         panel.add(current); 
         add(panel); 
         setVisible(true); 
         ///add(current); 
 [/FONT]
[FONT=Courier, Monospaced]//        pack(); 
 [/FONT]
[FONT=Courier, Monospaced]    } 
 [/FONT]
[FONT=Courier, Monospaced]    private void setLookAndFeel(){ 
         try{ 
 [/FONT]
[FONT=Courier, Monospaced]UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
             SwingUtilities.updateComponentTreeUI(this); 
         }catch(Exception e){ 
             System.out.println("errorrrr"); 
         } 
     } 
 [/FONT]
[FONT=Courier, Monospaced]    public void iterate(){ 
         while(num<2000){ 
             current.setValue(num); 
             try{ 
                 Thread.sleep(1000); 
             }catch(InterruptedException e){} 
             num+=95; 
 [/FONT]
[FONT=Courier, Monospaced]        } 
 [/FONT]
[FONT=Courier, Monospaced]    } 
 [/FONT]
[FONT=Courier, Monospaced]public static void main(String arg[]){ 
     ProgressMonitor frame=new ProgressMonitor(); 
     frame.setVisible(true); 
     frame.iterate(); [/FONT]