Hello Boda,
> In the API , ServletRequest Interface is mentioned as
>
> public abstract interface ServletRequest {
> }
>
> . A class can be an abstract class , if it has got abstract ( to be
> improved ) methods . But abstract interface is not making much sense to me
> . Any way all the interfaces need to be implemented by some classes . Then
> why this interface was declared specifically as abstract interface ?
This is a basic Java language question and has nothing to do with servlets.
An "interface" in Java is by definition "abstract" as every method in an
interface must be abstract. Typically, you do not add the 'abstract' keyword
to the interface (or method) definition because it is automatically assumed.
However, the language allows you to add these if you wish.
BTW, (and this might help you understand *why*) you can emulate a Java interface
in C++ (or other OO languages) by creating an abstract class with *all* abstract
methods. [However, this trick does not work so well in Java itself because of
the single inheritance constraint.]
Regards,
Bryan
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