JOptionPane Confusion!

Question

Hi,
Im having a real difficult time with JOptionPanes! Im still a newbie to Swing and I just cant seem to get my head around how to make the JOptionPanes do what you want them to! I've read the tutorials and manuals but im still stuck.
Basically, I have a JButton that brings up a JOptionPane. In this, the user types in the name of a camera. This is then added to a combobox (cameralist).
cameralist.addItem((JOptionPane.showInputDialog("Enter Camera Name")));
The problem is, how do I get the JOptionPane to close without doing anything else? Where do I add the code? At the moment it still adds the user's entry when you select cancel or the x in the top right hand corner.
Thanks for any help and Im sorry if I seem abit stupid!
Rach

Answer 1

First, trying to write a complex statement like that on a single line is bound to get you in trouble. Split the code up into several lines to make it readable, understandable and much easier to debug.
The showInputDialog will return null if the user cancels the dialog (I suppose). You should write something like this:
String result = JOptionPane.showInputDialog("Enter Camera Name");
if( result != null && !result.equals("") )
  cameralist.addItem( result );
}