Java Interview Questions and Answers
What is the difference between an Interface and an Abstract class?
abstract class can have instance methods that implement a default
behavior. An Interface can only declare constants and instance methods,
but cannot implement default behavior and all methods are implicitly
abstract. Moreover, an interface has all public members with no
implementation. On the other hand, an abstract class is a class which
may have the usual flavors of class members (private, protected, etc.),
but has some abstract methods.