When To Use Interface Over Abstract Class

  • 16 Jan, 2012

    Abstract Classes: Classes which cannot be instantiated. This means one cannot make a object of this class or in other way cannot create object by saying ClassAbs abs = new ClassAbs(); where ClassAbs is abstract class.Abstract classes contains have one or more abstarct methods, ie method body only no implementation.Interfaces: These are same as abstract classes only difference is we can only define method definition and no implementation.When to use wot depends on various reasons. One being design choice.One reason for using abstarct classes is we can code commonfunctionality and force our developer to use it. I can have a completeclass but I can still mark the class as abstract.Developing by interface helps in object based communication.

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