Answer Posted / nipun advinder

Interface:
1)In interface you cannot provide any implementations of
any function.
2)you must give implementations for all the methods of an
interface if you implement it in a class
3)cannot have private method
4)Scenario to use it would be to separate out the
implementation from the api

Abstract Class:
1)In interface you can provide implementations of any
function but at least one function should be abstract.
2)you must give implementations for all the abstract
methods of a abstract class if you extend it in a class
3)can have private method
4)Scenario to use it would be to denote is as a generalized
class which could provide some common functionality and you
want that it cannot be instantiated instead more
specialized forms are used.

eg abstract class account
class savingsaccount extends account
class currentaccount extends account

In this scenario assume that class account cannot provide
the complete functionality alone but contain some standard
ones.

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