Object-oriented programming: Difference between revisions

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Objects sometimes correspond to things found in the real world. For example, a graphics program may have objects such as "circle", "square", "menu". An online shopping system might have objects such as "shopping cart", "customer", and "product".<ref>{{cite book|last=Booch|first=Grady|title=Software Engineering with Ada|year=1986|publisher=Addison Wesley|isbn=978-0-8053-0608-8|page=220|url=https://en.wikiquote.org/wiki/Grady_Booch|quote=Perhaps the greatest strength of an object-oriented approach to development is that it offers a mechanism that captures a model of the real world.}}</ref> Sometimes objects represent more abstract entities, like an object that represents an open file, or an object that provides the service of translating measurements from U.S. customary to metric.

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|quote = Object-oriented programming is more than just classes and objects; it's a whole programming paradigm based around [''sic''] ''objects'' (data structures) that contain data fields and methods. It is essential to understand this; using classes to organize a bunch of unrelated methods together is not object orientation.

|author = Junade Ali

|source = ''Mastering PHP Design Patterns''<ref>{{cite book|last1=Ali|first1=Junade|title=Mastering PHP Design Patterns {{!}} PACKT Books|date=28 September 2016|publisher=Packt Publishing Limited|___location=Birmingham, England, UK|isbn=978-1-78588-713-0|page=11|edition=1|url=https://www.packtpub.com/application-development/mastering-php-design-patterns|access-date=11 December 2017|language=en}}</ref>

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|align = right

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Each object is said to be an [[instance (computer science)|instance]] of a particular class (for example, an object with its name field set to "Mary" might be an instance of class Employee). Procedures in object-oriented programming are known as [[Method (computer science)|methods]]; variables are also known as [[Field (computer science)|fields]], members, attributes, or properties. This leads to the following terms: