Interview Question

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posted 21 years ago

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I had a job interview this afternoon and the guy talked about the 8 or 9 fundamental principals of OO. One was something like open/close. The other was like seperation of interface. HUH?
Did he get this in some OO class I did not take or did I miss something.
PS where can I read more?

Ilja Preuss

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posted 21 years ago

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I don't know about the classes you took, but these principles are rather well known and important (or so it seems to me...).
You can get an overview of the principles at http://www.objectmentor.com/resources/listArticles?key=topic&topic=Design%20Principles
They are also discussed at http://c2.com/cgi/wiki?PrinciplesOfObjectOrientedDesign
The book "Agile Software Development - Principles, Patterns and Practices" by Robert Martin is very good at putting the principles in context, IMO.
Hope this helps...

The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus

Sondra Colagrossi

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posted 21 years ago

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Are these basic OO or do they have their roots in Agile and XP Methodologies?
TIA

Ilja Preuss

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posted 21 years ago

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They are basic OO and in no way bound to Agile development.

With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.