Swing problem

[Leo P.]

I haven't used Swing too much, but I've recently run into a problem
that I'm not sure how to fix. When I remove all components from a
JPanel and then add new components to it, the panel displays the new
components if they are AWT components, but not if they're Swing
components. Example

import java.awt.*;
import javax.swing.*;
public class test extends JFrame
{
public static void main(String[] args)
{
new test();
}
public test()
{
JPanel panel = new JPanel();
panel.add(new Button("a"));
panel.add(new Button("b"));
getContentPane( ).add(panel);
pack();
show();
try{Thread.slee p(3000);}catch( Exception ex){}
panel.removeAll ();
panel.add(new Button("c"));
panel.add(new Button("d"));
panel.repaint() ;
}
}

This works fine. But if I change Button to JButton everywhere, then
the panel goes blank after 3 seconds. Can anyone tell me why this
happens?

Thanks in advance

[Raymond DeCampo]

Leo P. wrote:
[snip]

panel.repaint() ;
}
}

This works fine. But if I change Button to JButton everywhere, then
the panel goes blank after 3 seconds. Can anyone tell me why this
happens?

Leo,

Change the call to repaint() to revalidate(). Use revalidate() whenever
a component's lay out needs to be redone.

HTH,
Ray

--
XML is the programmer's duct tape.

[Leo P.]

That works great. Thanks for answering my question even though I
accidentally posted it into someone else's thread

Raymond DeCampo <rd******@spam. twcny.spam.rr.s pam.com.spam> wrote in message news:<rc******* ***********@twi ster.nyroc.rr.c om>...

Leo P. wrote:
[snip]

panel.repaint() ;
}
}

This works fine. But if I change Button to JButton everywhere, then
the panel goes blank after 3 seconds. Can anyone tell me why this
happens?

Leo,

Change the call to repaint() to revalidate(). Use revalidate() whenever
a component's lay out needs to be redone.

HTH,
Ray