Re: Inline Listeners

From:

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <arne@vajhoej.dk>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 12 Jun 2007 23:30:53 -0400

Message-ID:

<466f64e0$0$90264$14726298@news.sunsite.dk>

Jason Cavett wrote:

On Jun 11, 8:31 pm, Arne Vajh?j <a...@vajhoej.dk> wrote:

Jason Cavett wrote:

On Jun 11, 10:43 am, Robert Klemme <shortcut...@googlemail.com> wrote:

On 11.06.2007 16:25, Jason Cavett wrote:

I am added listeners (DocumentListener) to a GUI component
(specifically a class that extends JTextField). I am wondernig why
listeners can be instantiated WITHOUT knowing any of the information
within the listener. For example...

Your anonymous class inherits a reference to the instance of the
surrounding class. Your method commonUpdate() are invoked on that
instance; same for fields ("nameTextField" in this case).

Is there any particular reason you would/would not want to do this?
(For example, the reason I did it this way is because every text field
reacts somewhat differently depending on the field.

Some people (including me) find the code rather unreadable.

Yeah. That's my biggest complaint. But, honestly, I'm not sure of a
better way to go about it. I mean, given the fact that something
different is done based on each text field, button, etc it seems like
I could either:

A. Create a ton of specific classes for each item.
B. Do it inline.
C. ???

If there's another way, I'd be open to hearing it. Listeners have
always given me problems from an OO perspective.

I am not aware of any brilliant solution.

I tend to prefer passing this to all and then have
the actionPerformed test for source.

Arne