interface and abstract class

[Member 4708077]

when we use the abstract class nad when we use the interface int applictions

raja

[Giorgi Dalakishvili]

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[bwilhite]

I'm assuming your question is more of a design question (where Google might not help much), as opposed to a simple question of what each is... Personally, I tend to favor interfaces over abstract classes. I tend to use an abstract class only when I want to implement something like the template design pattern. I've been steadily moving towards keeping my objects more loosely-coupled, which interfaces help to do quite nicely. With an abstract class, however, that's not really true. Hope that helps a bit. BW

[Mark Churchill]

An interface is more of a service contract, whereas an abstract class is a base set of functionality which is useless by itself.

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[bwilhite]

Yep, exactly. It took me a year to really get that.