Thread: dispose()'ing a JFrame and replacing it

so, im trying to catch a cancel button click from a JOptionPane, then send the exception up to the window controller, have it destroy the JFrame the exception came from, then start over with the main JFrame of the program.

as that's probably convoluted, i'll post some code.

//from inside the JFrame
try
{
	difficulty = (String) JOptionPane.showInputDialog(null, "What difficulty would you like?", "Game",
			JOptionPane.QUESTION_MESSAGE, null, dificultyChoices, dificultyChoices[0]);
}
catch(HeadlessException ex)
{
	//wc is a window controller
	wc.canceled(this);
}

//from the window controller
public void canceled(JFrame callingWindow)
{
	callingWindow.dispose();
	//createWindow() draws the window i want to replace callingWindow
	createWindow();
}

the problem with this is that the original JFrame goes right ahead executing its next line of code. but, of course, since it's just been dispose()'d, it throws a NullPointerException and crashes.

how should i actually be implementing this?

thanks for the reply.

as it stands, ive revised it a little, and heres the code ive got:

http://musasabi.h4xful.net/misc/home...manproject.zip

I added a little to my last post - didn't think you'd be back so quick

haha. yeah, i was talking to my professor yesterday, and since my current revision has an "if the user hits cancel, dispose of the window", line, he said i could just wrap everything else in an else block, ugly though that may be. i figure if thats the solution, the flow of the code needs to be reworked, though.