Re: Imitating a JFrame extended program with JPanel; help needed...

hi all,
there is a simple prog in the book "Sams teach ..." which extends
JFrame. its an example for actionListener.

since i heard i cant apply lookandfeel() for JFrame, i wanted to write
the programe extending JPanel.
the code i wrote correctly gets compiled. but nothing is getting
displayed ( i mean no buttons popping out).

please can you check whats the prob?

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import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import java.awt.*;
import net.miginfocom.swing.MigLayout;

/**
  *
  * @author arshad
  */
public class AL2 extends JPanel implements ActionListener{

     JTextField countText=new JTextField();
     JButton button=new JButton("Click to increment");
     private int numClicks=0;

     public AL2(){

         super();
         themes();

         Dimension
d=java.awt.Toolkit.getDefaultToolkit().getScreenSize();
         setSize(d);
         JPanel pane=new JPanel(new MigLayout("Wrap 1"));

         pane.add(countText);
         pane.add(button);
         add(pane);
         button.addActionListener(this);
         setVisible(true);

     }

     public void actionPerformed(){
         numClicks++;
         countText.setText("Button CLicked"+numClicks+"Times");
     }

     public void actionPerformed(ActionEvent arg0) {
         throw new UnsupportedOperationException("Not supported yet.");
     }

     public static void main(String arg[]){
         AL2 a=new AL2();
     }

     public void themes(){

try{UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
         SwingUtilities.updateComponentTreeUI(this);}catch (Exception e)
{
             System.out.println("errror in applying the theme");
         }
     }

}