OOPS

 OOPS 

OOPS is stand for Object-Oriented Programming System. Object means a real-life entity such as a pen, chair, computer, tablet, watch, etc. Object-Oriented Programming is a methodology or paradigm to design a program using classes and objects.

The main aim of Object-Oriented programming is to implement real-world entities 

for example : Object, classes, abstraction, inheritance, polymorphism, etc.

Object :

An entity that has a state and behavior is known as an object. 

for example : pen, chair, table, keyboard, etc.

it can be physical and logical.

Class :

The collection of objects is called class. It is a logical entity.

A class can also be defined as a blueprint from which you can 

create an individual object. Class doesn't consume any space.

Inheritance :

When an object acquires all the properties and behaviors of a parent object, it is known as inheritance. It provides code reusability. It is used to achieve runtime polymorphism.

Polymorphism :

If one task is performed in different ways, it is known as polymorphism.

for example: to convince the customer differently, to draw something, for example,

shape, triangle, rectangle, etc.

In java, we use method overloading and method overriding to achieve polymorphism.

Abstraction :

Hiding internal details and showing functionality is known as abstraction.

for example : Phone calls we don't know about internal processing.

In java, we use abstract class and interface to achieve abstraction.

Encapsulation :

Binding or wrapping code and data together into a single unit are known as encapsulation.

for example  : a capsule, it is wrapped with different medicines.

A java class is an example of encapsulation. Java bean is the fully encapsulated class because all the data members are private here.