Answer Posted / rakesh.fanu

Abstract Class :-
Abstract class should be declare with abstract.
Abstract Class must be extended by its sub class.
Abstract Class has abstract method and also method with
body also.
Abstract Class has not instance variables , it contain only
Constant.
An abstract class cannot be instantiated

Interface :-
Interface must be Implemented by another class.
Interface has only abstract method.
Interface has not instance variables , it contain only Constant.
An Interface cannot be instantiated

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