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)
You are assuming your listener is the only listener. That's not a good
assumption to make.
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.
Why not use a debugger or printf?
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