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Open Close Principle

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Information about Open Close Principle
Education

Published on January 22, 2014

Author: thaichor

Source: slideshare.net

Description

SOLID design principle, Open Close Principle
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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

Break application

Example

Discussion

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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