Answer Posted / brijendra kumar(xavient)

Abstract Class:

1-Abstact class declare with the abstract keyword.
2-Abstract class contains the both method declaration and
defeination.
3-Abstract class donot have the instant variable.It have
only constrants.
3-Abstract class extended by its sub class.
4-Abstract class support only single inheritence.

Interface:

1-Interface declare with the interface keyword.
2-Interface contains the only collection of method
signature.
3-Interface implement by a class.
4-Interface extended by one or more interfcae.
5-Interface support the multiple inheritence.
6-Interface is useful for java development.

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