lecture2_2up - Object-Oriented Software Engineering...

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Object-Oriented Software Engineering Practical Software Development using UML and Java Chapter 2: Review of Object Orientation Lecture 2 42 2.1 What is Object Orientation? Procedural paradigm: • Software is organized around the notion of procedures Procedural abstraction —Works as long as the data is simple Adding data abstractions —Groups together the pieces of data that describe some entity —Helps reduce the system’s complexity. - Such as Records and structures Object oriented paradigm: • Organizing procedural abstractions in the context of data abstractions
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43 Object Oriented paradigm An approach to the solution of problems in which all computations are performed in the context of objects. • The objects are instances of classes, which: —are data abstractions —contain procedural abstractions that operate on the objects • A running program can be seen as a collection of objects collaborating to perform a given task 44 A View of the Two paradigms
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45 2.2 Classes and Objects Object • A chunk of structured data in a running software system • Has properties —Represent its state • Has behaviour —How it acts and reacts —May simulate the behaviour of an object in the real world 46 Objects
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47 Classes A class: • A unit of abstraction in an object oriented (OO) program • Represents similar objects —Its instances • A kind of software module —Describes its instances’ structure (properties) —Contains methods to implement their behaviour Something should be a class if it could have instances Something should be an instance if it is clearly a single member of the set defined by a class Film Class; instances are individual films. Reel of Film : Class; instances are physical reels Film reel with serial number SW19876 Instance of ReelOfFilm Science Fiction Instance of the class Genre .
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