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OOP Definitions

By James Hippolite, in , posted: 23-Apr-2008 07:45

Just for my own benefit really, I wanted to put the definitions down in my own words.

The 3 tenets (pillars?) of OOP are: Encapsulation, Inheritance & Polymorphism.
  • Encapsulation: instance variables can only be accessed by instance methods.  Objects cannot get directly at the internal data of other objects.
  • Inheritance: Sub-classes can inherit the behaviours of super-classes (and extend them).
  • Polymorphism: An object can send the same message (call the same method) on different objects.  It doesn't matter whether the methods perform vastly different actions; the interface is the same.

Have I grossly over-simplified?  Any other suggestions?  What about Abstraction?  Is that covered by Encapsulation or not?

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James Hippolite
New Zealand

Welcome to my technical blog. 

Here, I attempt to distill the Microsoft Certified Professional Developer knowledge I have accumulated since first qualifying MCP in 1996.  This blog started on 13 September 2007 as an off-shoot from my mixed up personal blog.  But it took a shot in the arm from Scott Hanselman's talk at TechEd New Zealand 08 "32 Ways To Make Your Blog Suck Less".