Answer Posted / amit

Abstract provides both methods with and without body.
Adding new methods in abstract class in middle of
development life cycle won't break existing sub classes
unless these methods are declared as mustoverride. If there
are frequent addition of new methods properties and so on.
one should use abstract..

Whereas on the other hand interface can fill gap of
multiple inheritance. One can
implement from more than one interface. Not same with
Abstract. One can inherit
from only one abstract class.

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