Published on January 22, 2014
Open Closed Principle
● OOP and OOD ● Open Closed Principle ● The Idea ● Problems Solved ● Example and Discussion
Object Oriented Programming
Object-oriented programming (OOP) is a programming paradigm that represents concepts as "objects" that have data fields (attributes that describe the object) and associated procedures known as methods.
Object Oriented Design
Object-oriented design is the process of planning a system of interacting objects for the purpose of solving a software problem.
Open Closed Principle
"software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification"
The idea was that once completed, the implementation of a class could only be modified to correct errors; new or changed features would require that a different class be created.
Class keeps growing when requirements are increased, which is to add new functionalities to it.
Break single responsibility at some point
Break existing test and public API
When to know if a class is completed?
When to know that we are applying OCP?
What do I do if business logic has changed?
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In 1988 the open closed principle (OCP) is already mentioned by Bertrand Meyer : Software entities (classes, modules, functions, etc.) should be ...
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The book examples given of this principle seem to be rigged to only show changes that go "with the grain" of the example's partitioning. For example, they ...
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Das Open-Closed-Prinzip (Prinzip der Offen- und Verschlossenheit, kurz OCP) ist ein Prinzip beim objektorientierten Entwurf von Software. Es beschäftigt ...