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Interface Vs Abstract Class

There are three differences between an interface and an abstract class:

Actually the first point is the reason for the existence of interfaces in Java: to provide a form of multiple inheritance. In languages with multiple implementation inheritance, an interface would be equivalent to a fully abstract class (a class with only public abstract members).

The above differentiation suggests when to use an abstract class and when to use an interface:

In general, prefer interfaces if you don’t need to use an abstract class, because they provide more design flexibility.


Source: JavaRanch

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