posted 16 years ago
I think you mean Marker Interfaces.
Google for that term (maybe plus "java") and you'll get plenty of information.
Note that Marker Interfaces, while still used by plenty of current Java APIs, should not be created(*) in new code. If you were thinking of creating a new Marker Interface, it would usually be better to create a new type of Annotation.
(*) Note that I say "created", not "used".
Betty Rubble? Well, I would go with Betty... but I'd be thinking of Wilma.