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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.
Abstract classes allow you to provide default functionality for the subclasses. If you plan on updating this base class throughout the life of your program, it is best to allow that base class to be an abstract class.