Principles of Object Oriented Programming

4 principles of Oops 

Abstraction: 

Hide Implementation and let the implementing class take care of details. It is generalisation. Abstract base class.

Encapsulation: 

Hide the data within the scope of class and allow access to properties through access modifiers. private fields /variables

Inheritance: 

Derived class inherits the base class. It is specialisation class. SportsCar : Car | MUV : Car
Is -A Relationship

Polymorphism : 

Overloading and Override Method.

Composition class- has a relationship Product --compose of price class, Ingredient Classs 

Journey towards Clean architecture

 During the early inception of technology, we started with Classic Three Layered Database centric Architecture.

Traditional Database centric 3 Layered Architecture

Onion Architecture