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1 Abstract classes can have methods with implementation whereas interface provides absolute abstraction and canât have any method implementations. 2  Abstract classes can have constructors but interfaces canât have constructors. 3  Abstract class have all the features of a normal java class except that we canât instantiate it.
A third party class must be rewritten to extend only from the abstract class. is-a vs -able or can-do Interfaces are often used to describe the peripheral abilities of a class, not its central identity, e.g.