CSC/ECE 517 Fall 2009/wiki2 15 ms

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Introduction

"Object-oriented programming is a method of implementation in which programs are organised as cooperative collections of objects, each of which repressents an instance of some class, and whoes classes are all members of a hierarchy of classes united via inheritance relationships."taken from Object-Oriented Analysis and Design by Grady Booch
For all the things that we define as object oriented, the main framework is the object model. (what is object model) There are main elements of an object model, namely -:

  • Abstraction
  • Encapsulation
  • Modularity
  • Hierarchy

The goal of this article is to describe how abstraction relates to object oriented languages.

Definition of Abstraction

Abstraction (from the Latin abs, meaning away from and trahere, meaning to draw) is the process of taking away or removing characteristics from something in order to reduce it to a set of essential characteristics.taken from [2]

An alternate definition given in the book object oriented analysis and design is -:

An abstraction denotes the essential characteristics of an object that distinguish it from all other kinds of objects and thus provide crisply defined conceptual boundaries,relative to the perceptive of the viewer.

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