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interfaces

 
Kuma Akel
Greenhorn
Posts: 6
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Hi,

The following is a question from Dan Chisholm's Mock exams..

Which of the following statements is not true?

a. An interface that is declared within the body of a class or interface is known as a nested interface.
b. A constant can be a member of an interface.
c. A class declaration can be a member of an interface.
d. If an interface is named in the implements clause of a class, then the class must implement all of the methods declared within the interface.
e. None of the above.

The answer is (d)

Though answer d is correct, I do not understand the (a) and (c). After I did this question, I went and reread the K&B on this topic, no where it mentions anything about it. So far I have been thinking, only the constants either objects or primitives and abstract methods are allowed to declare in interfaces. Can somebody explain me those two statements?
 
It is sorta covered in the JavaRanch Style Guide.
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