If you tell the IDe to clean or clean All, it will
only remove the class files that match source
files it has.  It will not remove all class files
from the directory as I believe it should.

clearly this is intentional behavior because its
not simply doing a del *.class as one would
expect.  So at the very least their should be some
indication that their are unknown classes in the
classes directory so when you run your program and
its doing strange stuff, you know that their are
some extra classes hanging around.


For me this problem occurs when you compile, then
rename a file.  The already generated class file
is never cleaned up.    causes problems when your
refactoring the code.