Closing one window and opening another

Using Netbeans 5.0, I'm trying to teach myself some Java more
complicated than System.out.println("Hello World.");

I'd like some help figuring out the best way to build a login-style
screen. It seems that I could create a main class and the two forms.
My main could call LoginScreen, which listens for a button press, hides
itself on command ... and this is where I get iffy. I doubt action
listeners can return a value, so I think I need to implement a personal
'yo, successful login' event and wrap that around login in a try/catch
block, which would catch the event and ask the 2nd window to show
itself.

Is that a reasonable implementation of the idea, and if not, some
pointers to whatever I'm missing would be much appreciated. :)

Thanks

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