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Nitin Kushwaha

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Anonymous User

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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