Re: Bogus behavior of window listeners

I mentioned earlier that my app's "are you sure?" on-exit dialog was
suddenly popping up twice. I've since found it popping up only once, as
it should, under a well-defined set of circumstances that prove the
culprit to be one of two occurrences of:

if (frame.getWindowListeners().length > 0)
    frame.removeWindowListener(frame.getWindowListeners()[0]);

Now we have a clear case of where this fails exactly once. The app adds
an initial window listener, and at a later time when there's some
cleanup to be done on exit it replaces that one with a different one.
If the cleanup stops being needed, it replaces it again. Although the
code in that replace is identical to the code in the first, I expect
javac is probably dumb enough to create two different anonymous inner
classes for these, so the third and the first aren't the same class as
the JVM sees it.