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Can interface be abstract?

 
Greenhorn
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I happened to see the following interface declaration in java.servlet package:
public abstract interface HttpSession
So can interface be abstract? If so, how will it be different from an non-abstract interface?
Thanks
Xu Jing
 
Ranch Hand
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Hi,
An interface is implicitly abstract, and don't provide any implementations for its methods.
Clement
 
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Interfaces are abstract: there's no such thing as a non-abstract interface. The use of the abstract modifier with interfaces is obsolete and new programs should not use it.
Junilu
 
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