Wednesday, March 14, 2007

What is the difference between an Interface and an Abstract class?

An 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. An interface has all public members and no implementation. An abstract class is a class which may have the usual flavors of class members (private, protected, etc.), but has some abstract methods.

1 Comments:

At 7:53 PM, Blogger Saifuddin.Merchant said...

One more.
An interface is used to specify a contract that the class must implement.

An abstract class is useful to create a reusable base.

Sam - -- Java quiz with a twist

 

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