If a super class implements an interface does the subclass automatically implement the interface? Obviously the subclass will inherit all the methods required by the interface but would you still need to write the "implements interface" line?
No, you do not need to explicitly state again that the class implements that interface. Some people do "for clarity" but really it's less clear to do so - the assumption would be that the superclass did not implement that interface
> If a super class implements an interface does the
> subclass automatically implement the interface?
No. The super class already implemented the interface. The sub class use the implementation.
> Obviously the subclass will inherit all the methods
> required by the interface but would you still need to
> write the "implements interface" line?
No
Manuel Leiria
No, subclasses don't need to declare they implement an interface, which has been declared in a superclass. The subclass will automatically implement the interface, too.
-Puce
Remember that implementing an interface and extending a class are just 2 different ways of expressing inheritance, so supertypes are supertypes regardless of whether they're classes or interfaces
