Answer / ravi raj

Abstract Class:
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1.abstract class contain the abstract and non-abstract methods
2.abstract class contain static and non-static variables
3.through abstract class we can get 0-50% abstraction in java
4. if any class declared as a abstract i.e abstract class
5. we wont create instance for this class.
6. we cont make final for this class.

Interface :
-----------

1. Interface contains only abstracted methods.
2. it allows only static and final variables.
3. interface is by default abstracted and public.
4. through interface we get 100% abstraction.
5. we can solve the multiple threading in interface.

Answer / kumar rk

interface
---------
in java interfaces are fully unimplemented structures.
here all methods are public and abstract by default(added by compiler)

abstract class
--------------
abstract classes are partially implemented structure.
means it can have abstract method or may be not.
but in every case object cannot be created.

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