When to use Interface and Abstract base classes

When you don’t see any scope to extend/remove methods from the interface in the future then, using interface is a always a better decision. Otherwise use the abstract class. Of course there are other decision parameters before we come to any decision, for that, please refer the below articles.

For more details:

Article from Brad Abrams
http://mindprod.com/jgloss/interfacevsabstract.html

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