Re: OOP can be simply summed up as 'passing messages to objects'

Responding to Jacobs...

While peer-to-peer collaboration is crucial to OOA/D/P and separation of
message and method is crucial to decoupling implementations in OOA/D,
messages aren't really what the OO paradigm is about. If one wants a
thumbnail phrase I think a better one would be: basing software
structure on intrinsic problem space structure through abstraction.
Problem space abstraction is probably the only truly unique thing that
the OO paradigm brings to the table.



This is more or less the "objects model real world objects" definition
of "object".

Not at all. Note that I said 'problem space', not 'real world'. Your characterization only applies if one takes the myopic view that the "real world" is only where the customer lives. However, computing environments, mathematics, and a host of other problem spaces also constitute conceptual worlds that are quite real. A typical application will abstract from several problem spaces and one cannot even do OOD/P without abstracting various computing problem spaces, which are quite different than the customer's "real world".


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H. S. Lahman
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