When should i use abstract classes and interfaces, JAVA Programming

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When should I use abstract classes and when should I use interfaces?

Use Interface, when:

Design changing often or when various implementations only share method signatures.
When we need some classes to use some methods which we don't want to be included in class.

Use Abstract Class, when:

Several implementations are of the same kind and use common behavior.
Enabling with generalized form of abstraction and leave implementation task with inheriting subclass.
creating planned inheritance hierarchies

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