🚀 go-pugleaf

Hello,

I'm trying to create a JTextField that implements the DocumentListener
interface.  I'm not sure if this is what I even need to do based upon what I
need.  I need to be able to tell whether or not a user is entering in new
data into a JTextField.  There might already be data in a field displayed to
the user, so that means the user could overwrite it and create a "dirty"
state for this screen I'm working on.  I need to track the dirty state,
which I can do through a boolean variable, I'm sure.

So far, I've made a class that extends JTextField and implements
DocumentListener.  I have print out statements within the changedUpdate,
insertUpdate and removeUpdate methods.  My constructors are: super( ), and
super(text).  I can use this class as is, but of course nothing happens, so
I know I'm missing something but I don't know what it is.  Any guesses at
what I might be missing will be appreciated.  Thanks.

Jeff