Do you have SCJP/OCPJP certification? Then you should know static methods can not be added to an interface. You should also know that you can access static members from an instance method, but accessing instance members from a static method will give you a compiler error.
Hello Ray buddy,
I recommend you to read Terry and Andrew Monkhouse's SCJD study guide for reference. It is very helpful and it provide some information about RMI.
You can also visit Oracle's tutorial about RMI.