hi all, i am writing this post to ask that: 1.is it necessary for an interface to have an concrete class(non abstract)implementation? what i mean to say is that can we have a source file compiled with only interfaces and it's implementing abstract classes without a non abstract class???
2.is it the same case with a class extending an abstract class??? i.e. is it necessary to give an non abstract class extending an abstract class to compile code correctly???