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]

Re: Swing problem

Leo P. wrote:
[snip][color=blue]
> 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?
>[/color]

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.]

Re: Swing problem

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

Raymond DeCampo <rdecampo@spam. twcny.spam.rr.s pam.com.spam> wrote in message news:<rcFIc.378 09$yd5.4652@twi ster.nyroc.rr.c om>...[color=blue]
> Leo P. wrote:
> [snip][color=green]
> > 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?
> >[/color]
>
> Leo,
>
> Change the call to repaint() to revalidate(). Use revalidate() whenever
> a component's lay out needs to be redone.
>
> HTH,
> Ray[/color]