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abstract interface

 
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I found that it is legal to declare a interface as abstract.
Is there any advantage in declaring a interface as abstract. We all know that all method in interface are implicitly abstract. will this declaration make any difference in the interface?
 
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It is legal to declare an interface as abstract but it is considered redundant. Interfaces are implicitly abstract.
 
Don't get me started about those stupid light bulbs.
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