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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.
@Jiazzyuser If an abstract class implements an interface, it does not have to actually define the interface's methods. That requirement can be deferred to inheriting/child concrete classes. However, a concrete class must implement all interface methods that are not implemented by its parent class.