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

From:

Amr <fromwindowstolinux@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 15 Feb 2010 09:25:13 -0800 (PST)

Message-ID:

<fc76a2be-f94f-4932-8b84-b880136264af@f29g2000yqa.googlegroups.com>

On Feb 15, 10:10 pm, RedGrittyBrick <RedGrittyBr...@spamweary.invalid>
wrote:

On 15/02/2010 16:02, Amr wrote:

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?

--------------------------------------------------

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();

If I remember correctly, Look & Feel has to be applied before any GUI
code runs.

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

Same mistake as before! See my reply in your earlier thread.

         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 support=

ed yet.");

     }

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

     public void themes(){

try{UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName())=

;

SwingUtilities.updateComponentTreeUI(this);}catch (E=

xception e)

{
System.out.println("errror in applying the t=

heme");

}
}

}

thank you very much for your reply, i removed lookandfeel.
but still nothing is displayed :(