NumberFormat

From: Rafal Bielec (reply_at_to.group.at.it)
Date: 12/24/03 

Date: Wed, 24 Dec 2003 19:15:52 +0100

Can some one please tell me what methods should I override for the
NumberFormat to accept both only numbers and emplty string ("")? I've gone
through all the docs I could find but I can't find what is responsible for
telling JFormattedTextField that a certain char is incorrect :-/