>> Heh. It amuses me that run-time polymorphism via inheritance is /the/
>> central contribution of the OO movement, and here I am reading a book
>> warning me not to use inheritance under any circumstances unless
>> absolutely unavoidable...
>
> So, what's their solution? You have to reinvent the wheel all the time?

Use interfaces instead.

> So if you need a linked list of widgets and a linked list of gizmos, you
> have to have two complete sets of add(), remove() and iterate() methods?

That is better handled with generics than any kind of inheritance. A 
better example might be a single-linked list and a double-linked list.

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