Design for Extension

Hi! I have recently read about Design for Extension [1], which says
that all your methods should be either

* abstract,
* final, or
* have an empty implementation

This forces you to design the classes for extension, i.e. provide hooks
for each extension you need. I used to be an opponent of final methods,
because you never know in advance when you have to extend something.
But from the viewpoint described in [1] this makes a lot of sense. What
are the opinions on this topic? I could not find anything with Google.
I am curious if anyone here has use this approach for a project and can
share his experience?

[1]
http://checkstyle.sourceforge.net/config_design.html#DesignForExtension

--
Martin Ankerl | http://martinus.geekisp.com/

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