Object Oriented
Programming
OOP is
a programming paradigm that represents concepts as “objects” that have data fields (attributes that describe the
object) and associated methods. Objects (instances of classes) are used to interact
with one another to design applications and computer programs.
OO basics principles:
Polymorphism
Abstraction
Encapsulation
Inheritance
Design
Principles:
Design
principles are core abstract principles which we are supposed to follow while
designing software architect. Remember
they aren't concrete; rather abstract.
OO principle is a set of guidelines that
ensures OOP concept.
Based on the OOP concept, this defines ways to design better way, a better
design.
Examples:
1.
Single Responsibility Principle
2.
Open Close Principle
3.
Liskov’s Substitution Principle
4.
Interface Segregation Principle
5.
Dependency Inversion Principle
Design Patterns:
They
are solutions to real world problems that pop up time and again, so instead of
reinventing the wheel, we follow the design patterns that are well-proven,
tested by others, and safe to follow. Now, design patterns are specific, there
are terms and conditions only in which they can be applied.
OO
design patterns (OODPs) are those which provide a general solution to object
oriented design based OO principle.
Design patterns are discovered, not
invented.
Examples:
Singleton
Pattern
Factory
pattern.
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