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Object-oriented programming (OOP) is a programming paradigm based on the object[1] – a software entity that encapsulates data and functionality. An OOP program consists of objects that interact with one another.[2][3] A programming language that provides OOP features is classified as an OOP language but as the set of features that contribute to OOP is contended, classifying a language as OOP and the degree to which it supports or is OOP, are debatable. As paradigms are not mutually exclusive, a language can be multi-paradigm – can be categorized as more than just OOP.
Sometimes, objects represent real-world things and processes in digital form.[4] For example, a graphics program may have objects such as "circle", "square", and "menu". An online shopping system might have objects such as "shopping cart", "customer", and "product". Niklaus Wirth said, "This paradigm [OOP] closely reflects the structure of systems in the real world and is therefore well suited to model complex systems with complex behavior".[5]
However, more often, objects represent abstract entities, like an open file or a unit converter. Not everyone agrees that OOP makes it easy to copy the real world exactly or that doing so is even necessary. Bob Martin suggests that because classes are software, their relationships don't match the real-world relationships they represent.[6] Bertrand Meyer argues that a program is not a model of the world but a model of some part of the world; "Reality is a cousin twice removed".[7] Steve Yegge noted that natural languages lack the OOP approach of naming a thing (object) before an action (method), as opposed to functional programming which does the reverse.[8] This can make an OOP solution more complicated than one written via procedural programming.[9]
Notable languages with OOP support include Ada, ActionScript, C++, Common Lisp, C#, Dart, Eiffel, Fortran 2003, Haxe, Java,[10] JavaScript, Kotlin, Logo, MATLAB, Objective-C, Object Pascal, Perl, PHP, Python, R, Raku, Ruby, Scala, SIMSCRIPT, Simula, Smalltalk, Swift, Vala and Visual Basic.NET.
- ^ Cite error: The named reference
alanKayOnOOwas invoked but never defined (see the help page). - ^ Kindler, E.; Krivy, I. (2011). "Object-Oriented Simulation of systems with sophisticated control". International Journal of General Systems. 40 (3): 313–343. doi:10.1080/03081079.2010.539975.
- ^ Lewis, John; Loftus, William (2008). Java Software Solutions Foundations of Programming Design 6th ed. Pearson Education Inc. ISBN 978-0-321-53205-3., section 1.6 "Object-Oriented Programming"
- ^ Booch, Grady (1986). Software Engineering with Ada. Addison Wesley. p. 220. ISBN 978-0-8053-0608-8.
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.
- ^ Niklaus Wirth (23 January 2006). "Good ideas, through the looking glass" (PDF). IEEE Computer. Cover Feature. 39 (1): 28–39. doi:10.1109/MC.2006.20. S2CID 6582369. Archived from the original (PDF) on 12 October 2016.
- ^ "Uncle Bob SOLID principles". YouTube. 2 August 2018.
- ^ Meyer 1997, p. 230.
- ^ Yegge, Steve (30 March 2006). "Execution in the Kingdom of Nouns". steve-yegge.blogspot.com. Retrieved 3 July 2010.
- ^ Boronczyk, Timothy (11 June 2009). "What's Wrong with OOP". zaemis.blogspot.com. Retrieved 3 July 2010.
- ^ Bloch 2018, pp. xi–xii, Foreword.