Milt Epstein at [EMAIL PROTECTED] wrote:
> On Thu, 28 Jun 2001, Pier Fumagalli wrote:
>
>> Bo Xu at [EMAIL PROTECTED] wrote:
>>
>>> "Rajeshwar Rao.V" wrote:
>>>
>>>> Hi all,
>>>> Why ServletContext is declared as absrtact?
>>>> What does it mean by abstract interface?
>>>> As I know , every interface is by default abstract...
>>>> Am i missing something...
>>>> -raj-
>>>> [...]
>>>
>>> Hi :-) I read the source code of ServletContext.java in
>>> jakarta-servletapi-4_0-b5.zip:
>>> http://jakarta.apache.org/builds/jakarta-tomcat-4.0/release/v4.0-b5/src/
>>>
>>> it is "public interface ServletContext {...}", I don't find
>>> "abstract", perhaps you use another version of
>>> Servlet API?
>>
>> Java Language specification: An interface is ALWAYS all-abstract, all its
>> methods are abstract... :)
>>
>> Class -> can be instantiated as none of its methods are abstract
>>
>> Abstract Class -> cannot be instantiated as some of its methods are abstract
>> can be extended but not implemented
>>
>> Interface -> can be instantiated as all of its methods are abstract
> ^^^
> Was that supposed to be "cannot"?
>
>> can be extended by another interface and implemented by a class
>
> I suppose for completeness under "Class" it should include:
>
> can be extended but not implemented
You're CORRRRRRRRRRECT! :)
> Unless it's final. (What about abstract final classes? :-).
I believe that abstract and final cannot be specified on the same target
without generating a compiler error...
> Boy, when you try to be complete, you really get bogged down with
> details :-).
Heheheeh :)
Pier
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