[Ryan O]

jhersh is correct - usually, something like that would be done in Java via annotations, however the current Java being used for FRC does not support them. An interface was the least overhead solution we came up with during development. If you are just creating a dummy set of stuff, you can safely ignore the interfaces unless you plan to use the advanced plug-ins that were out for Java. Given that they have no methods, you could also just use these interfaces directly - even if methods are implemented later, you could add "dummy" implementations/calls for those methods later on.

Good luck with your project!