abstract classes and interfaces best practices in java

Question

So you\'ve got an interface and an abstract class that implements a subset of the methods in the interface. You\'ve also got some classes that inherit the abstract class and giv

Answer 1

The abstract class should implement the interface, and provide concrete implementations of common member functions. IIRC it shouldn't need to declare abstract methods for the elements it doesn't implement, as these are assumed to be needed to be implemented by subclasses.