Interface vs abstract class

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Interface vs abstract class

Hai,

 Is there any possible to defining abstract methods in Interface.
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June 24, 2011 at 11:08 AM

Difference between Abstract class and Interface

* Interfaces provide a form of multiple inheritance. A class can extend only one other class.
* Interfaces are limited to public methods and constants with no implementation. Abstract classes can have a partial implementation, protected parts, static methods, etc.
* A Class may implement several interfaces. But in case of abstract class, a class may extend only one abstract class.
* Interfaces are slow as it requires extra indirection to to find corresponding method in in the actual class. Abstract classes are fast.

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