Difference between interface and abstract class


Difference between abstract class and interface is one of the most asked question in interview.
Lets have a look on difference between interface and abstract class. 

Abstract Class vs Interface 
  • Abstract classed can have implementation for some of its members, but interface can not have implementation of any members. 
  • An interface can not contain fields but an abstract class can contain fields. 
  • Interface members are by default public and no explicit access modifier require, but abstract class members can have access modifiers. 
  • An interface can be inherited from another interface only and not from an abstract class, but abstract class can inherit from another abstract class or from interface.
  • Interface can not contain constructors.

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