Answer Posted / geetika.......:)

1)all methods in interface need to be defined in class that implemented it.but abstract class may define all some or none of the methods declared in it.
2)abstract class cant instantiate object but class with interface can
3)interface do not have constructors abstract classes have
4)class may implement number of interfaces but can extend only one abstract class
5)variables must be initialized in interface but its not necessary in abstract class.
6)interface has abstract functions but abstract class has abstract as well as concrete functions.

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