Changing a JPanel, remove () - add () - validate () only works once

Question

I have a JPanel with several JTextFields. When the user clicks a button, I need to replace it with a different JPanel. I only have two of these JPanels so far, but will add more later. Both of my JPanel objects are singletons; they are created the first time they are used and every time after that the object returns the same instance. I am using the following code to swap from one JPanel to another (the variable dialog is the containing JPanel).
dialog.remove (0);
dialog.add (otherPanel, 0);
dialog.validate ();This works fine, but only the first time. If I continue clicking the button to tell it to swap back and forth, the second panel remains displayed. I have a feeling this has something to do with me using singleton JPanels because after they have both displayed once it stops working, but I can't figure out why it would matter that they are singletons. If you remove a component, can you add that same component back again later? Is there something else I could be missing?

Answer 1

If you can't use a CardLayout, then the general format of your code should be:
panel.remove(...);
panel.add(...);
panel.revalidate();
panel.repaint();If you need further help then you need to create a "Short, Self Contained, Compilable and Executable, Example Program (SSCCE)", that demonstrates the incorrect behaviour.
http://homepage1.nifty.com/algafield/sscce.html
Don't forget to use the "Code Formatting Tags", so the posted code retains its original formatting.
http://forum.java.sun.com/help.jspa?sec=formatting
Better late than never :)
Edited by: camickr on Feb 24, 2008 12:22 AM