What is the OOP principle code example

Example 1: oop principles

Abstraction (Partial Abstraction & Interfaces)
Encapsulation (Private Field & Getter & Setter)
Inheritance (Super and Sub Class)
Polymorphism (Static - Overloading & Dynanmic - Overriding)

Example 2: what is oop and how it works

Object Oriented programming (OOP) is a programming 
paradigm that relies on the concept of classes and 
objects. It is used to structure a software program into 
simple, reusable pieces of code blueprints (usually called 
classes), which are used to create individual instances of objects.