interface vs. extending

[NRothwell@xxxxxxxxxxx (Nick Rothwell)]

> Thanks Marc. What about Abstract class and Interface then? Which one's
> more
> expensive? Thanks.
> 
	I'm really interested why you're asking these questions. I doubt
there's really much difference except in really critical applications, and
even there the differences are going to be swamped by other coding issues
and artifacts of the execution environment. Certainly, I wouldn't want to be
in a situation where my coding style in this context (subclassing versus
interface matching) was dictated by performance considerations.


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