abstract and interface difference

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what is the difference between abstract class and interface class and when we use these classes

Posted 1-Oct-11 10:08am

muzamil1

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Pradeep Shukla · Answer 1 · 2011-10-01T10:16:00

Solution 1

C'mon use google, it's full of all such examples and discussions:

Abstract Class versus Interface[^]

Posted 1-Oct-11 10:16am

Pradeep Shukla

Comments

Uday P.Singh 2-Oct-11 2:24am

my 5!

Simon Bang Terkildsen · Answer 2 · 2011-10-01T10:18:00

An interface defines properties and methods that your class must implement.

An abstract class
0) may define properties and methods that your class must implement if it's not your class is not abstract.
1) can have implementations of properties, methods and constructors

Any class can only inherit from one other class (abstract or not), but can implement multiple interfaces.

For more details see
Interfaces (C# Programming Guide)[^]
Abstract and Sealed Classes and Class Members (C# Programming Guide)[^]
Interfaces and Abstract Classes[^]

RaisKazi · Answer 3 · 2011-10-01T19:54:00

Solution 3

Google Search is absolutely free to find Answers of this type of Questions.

Google Search Result

Posted 1-Oct-11 19:54pm

RaisKazi

Comments

Uday P.Singh 2-Oct-11 2:25am

my 5!

RaisKazi 2-Oct-11 8:38am

Thanks Uday :)

Mohammad A Rahman · Answer 4 · 2011-10-06T19:03:00

Solution 4

In addition of all the answers provided,

Differences,
Interface Vs Abstract Class in C#[^]

When to use,
Recommendations for Abstract Classes vs. Interfaces[^]
Should I use an abstract class or an interface?[^]

:)

Posted 6-Oct-11 19:03pm

Mohammad A Rahman