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Last Updated: February 25, 2016
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· jessereese01
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SOLID - OOP Principles to Programming

Principles to program by ->

http://en.wikipedia.org/wiki/SOLID_(object-oriented_design)

S SRP:

Single responsibility principle

An object should have only a single responsibility.


O OCP:

Open/closed principle

“Software entities … should be open for extension, but closed for modification”.


L LSP:

Liskov substitution principle

“Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program”. See also design by contract.


I ISP:

Interface segregation principle

“Many client-specific interfaces are better than one general-purpose interface.”


D DIP:

Dependency inversion principle

One should “Depend upon Abstractions. Do not depend upon concretions.”
Dependency injection is one method of following this principle.

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