User Interfaces

Question

Hi all :)
I am new to Java, and making progress, but I am now at a point that I can't resolve and would like some help!
I have a class that takes an instance of Container as a method parameter, and adds a JPanel to it. When the JPanel is added, the applications user interface is not updated, so I never see the updated panel UNLESS I do something like re-size the app window.
The container has a default JPanel on which is visible, because I call the application class's show() method after initial construction.
I assume that somehow, I need to ask the UI to repaint, however, I am struggling to find the right method.
I have tried setVisible(true) amongst others, but all to no avail.
Do I have to use a ContainerListener in the Application class, and then somehow get the UI to repaint?

Answer 1

Try calling validate() on the Container to force components to be re-layed out. If that doesn't work, try invalidate() followed by validate().