Re: Inheritance

"Tom Serface" <>
Fri, 30 Mar 2007 20:23:21 -0700
again & agaom? :o)


"Al" <> wrote in message

I am still here just not much to say, I guess reading & thinking is where
at. I do want to thank you all, for your posts again, THANKS ALOT. I will
going back and reading them again & agaom to get a clearer understanding.
Now I better get back to my revisions.
Just Al

"jmarc" wrote:

You are right!

I realize that I use "agregation"
incorrectly! A collection is the
right thing. I would just specified
a little lack in the example, about
"a kind of", etc... for inheritance..

So, I mingle agregation and collection
incorrectly since I never being able to
distinguish them when I used graphical
UML tool.

Do you have a hint about this difference
in UML tool?


"Tom Serface" <> wrote in message

Hi Jean,

I kind of agree with you. A minute or second is not a kind of hour,
an hour is a collection of minutes and a minute is a collection of


"jmarc" <> wrote in message

I would just add this. In the early days
of my introduction of OO, I learn this
very helpfull thing. The notion of being
and having, to deternine if we can provide
inheritance between some concepts. The
notion of composition and agregation.

A minute, an hour and day can be derived
of from a concept called time. But, if you
effectively care about concept and not retain
just word to say something, an hour is a container
for minutes, and a day, a container for hours.

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