What is OOPs concept?

Nitin Kushwaha 889 12 Jul 2019

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Nitin Kushwaha

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1 Answers

Anonymous User 16 Jul 2019

OOPs (Object-Oriented Programming) Concept;-

It is a method that can be used to create a program by using classes and objects.

They provide some concepts such as:-

Objects.
Classes.
Inheritance.
Polymorphism.
Abstraction.
Encapsulation.

Object-

Any entity that has identity and behavior.
It is an instance of a class.
It may be physical or logical.
Example-chair, pen, fan, desk, etc.

How to create an Object:-

An object is created from classes, in Java.

Classname object=new classname();

Example-

Create an object and print value of i.

Class Student



{



int i=21;



public static void main(String args[])



{



Student s =  new Student();



System.out.println(s.i);



}



}



Output-



21

Class;-

It is a collection of an object.
It is a logical entity.
It does not contain any memory space.
In other words, a class is a blueprint of an object.

Create a Class-

public class student



 {



  int m = 22;



}

Inheritance;-

When one class is derived from another class.
In other words when one object(child) holds all the properties of another object(parent) is called inheritance.
Extend keyword is used to derive the class properties.

Polymorphism;-

If one thing can be represented in different ways is called a Polymorphism.
We can use Method overloading and Method overriding to achieve polymorphism, in java.
For example an area of Circle, Rectangle, Square, etc.

Abstraction

It is a process of hiding details and shows essential details only to the users.
Abstraction can be achieved either abstract classes or interfaces.
abstract keyword is used.

Encapsulation;-

It is a way to binding code into a single unit.
Every Java class is an example of encapsulation.
In encapsulation, we can use two methods-
Setter used for, set the value.
Getter used for, get the value

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What is OOPs concept?

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