Re: Forcing sub-classes to implement Constructor

On 8/9/07, Dmitry Beransky <[email protected]> wrote:
>
> On 8/9/07, Roger Jakobsen <[email protected]> wrote:
> > Is there a way to force subclasses of a class to implement a certain
> (read
> > empty) constructor.
>
> No, this is not possible.
>
> If I may put forth a bold statement: if you finding that you need to
> do this, you may want to take a step back and re-evaluate your design.
> Could you describe what you are trying to do in more detail?  I'm
> curious if there is a real use case for this.
>
>
> Regards
> Dmitry
>
>
>
We have this JMS implementation. The messages are classes that inherit from
the NetMessage class. The NetMessage class defines multiple abstract methods
like readFromStream(...) and writeToStream(...), etc. Now, if someone issues
a NetMessage without an empty constructor the JMS implementation will be
unable to re-create, or instantiate, it on the receiving side. It would be
nice to force subclasses to implement an empty constructor.

Roger

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