🚀 go-pugleaf

I'm not a JBuilder user but a Swing user who was searching for answers
to this same question when I saw yours. I tried the things you tried and
all failed. Then I saw ... the isValidateRoot() method. If you create a
subclass myPanel of JPanel and then override isValidateRoot() in it to
return true, adding new components and then calling revalidate() will
cause the behavior you want. Otherwise it looks like revalidate() will
only work inside a JScrollPane. 

I'm not saying this is sane or reasonable behavior, just the way it
appears to work. 

-Mike 

Frode Oldervoll wrote:
> 
> I have a JPanel (a)  that contains different other JPanels (b), one at a
> time, and I change the conent of panel a dynamically according to menu
> selections. My problem is that when I change the panels b the panel a won't
> redraw itself. I have tried various combinations of invalidate, validate,
> revalidate, etc., as in the code included below:
> 
>     a.removeAll();
>     b.setVisible(true);
>     a.add(b, "Center");
>     b.validate();
>     a.invalidate();
>     a.validate();
>     a.revalidate();
> 
> With all these validate-methods, the panel a still don't redraw itself with
> the correct content b. It works the first time I select a panel, but later I
> don't work.
> 
> What is the correct way to solve such a problem?
> 
> By the way, I use JDK 1.1.7 and Swing 1.0.3, but the problem is the same
> with JDK 1.1.6_Borland and Swing 1.0.1.
> 
> -Frode