.Net Framework Interview Questions and Answers
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 Question: 2411 Page Views: 

Contrast the use of an abstract base class against an interface?



Posted By: Avi Date: 22 August 2009 07:37:40 AM
 Answer:

Abstract class can provides implementation for some methods and properties while Interfaces can provide only declarations.

In simple term all methods in an interface are abstract but in abstract class some methods are abstract.


Posted By: eTechPlanet

Date: 22 August 2009 07:37:40 AM

then an Interface can be implemented by base abstact calss and can be given partially implement.Like Interface MyInterface { void Add(); void Sub(); } public abstract MyAbstract:MyInterface { public abstract void Add(); public void Mul(int a,int b) { return a*b; } public class MyVirtual:MyAbstract { public override void Add() { return a+b; } } }


Posted By: palanivel

Date: 7 October 2009 01:11:04 AM

In the interface all methods must be abstract, in the abstract class some methods can be concrete. In the interface no accessibility modifiers are allowed, which is ok in abstract classes.


Posted By: Johndecruse

Date: 12 February 2010 11:58:35 PM
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