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All abstract methods Vs interface

Ranch Hand

Joined: Dec 16, 2004
Posts: 63
Hi All,

This is really a beginners' question and my question is if an abstract class has all of its methods "abstract" in it(i.e. no concrete methods) then what will be the difference between this abstarct class and an interface.

Thank you
Campbell Ritchie

Joined: Oct 13, 2005
Posts: 42204
If all your methods are abstract you are better off writing an interface, because you can implement several interfaces in the same class, but only extend one class. Remember you usually miss out "public" and "abstract" in method declarations in interfaces.
It is sorta covered in the JavaRanch Style Guide.
subject: All abstract methods Vs interface