Answer / vijay

You can offer the best of both worlds, an interface and an
abstract class. Implementors can ignore your abstract class
if they choose. The only drawback of doing that is calling
methods via their interface name is slightly slower than
calling them via their abstract class name.

Answer / chitresh

Interface is use where we known that all these functions
which are declared in interface is implemented somewhere if
we call that interface.and we can use abstract class where
we don't known how it is implemented in call function.

Answer / mayank bhatnagar

Interface includes just the definition of methods whereas
Abstract Classes are just like classes and hold all
functionality of classes except certain features.
The only difference between Abstarct Classes and Interfaces
is the use.Abstract Classes were introduced becoz of
diamond problem in C,C++.You can only inherit these classes
but cannot instantiate(i.e. no object of these classes can
be created, there can be one or more methods abstact in
such classes).
Interfaces are public and can be used/inherited by multiple
classes which was not before possible.

Answer / bala

nothing to say....

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