Can a non-abstract class be extended (inherited from) in Java?

Question

Does the class need to have the abstract keyword before it? Or Does it need to have unimplemented (abstract) methods? Can any normal class be extended?

Answer 1

Yes, all methods which are not final (static is also a bit different form the rest), can be overridden, unless the class itself is declared final. Abstract methods are only used if you do not provide any implementation in the base class.