Object Oriented Programming(OOPs)

Encapsulation:

It is the process of hiding all the internal details of objects from the outside world

Abstraction:

It talks about hiding the complexity of code by providing set of interfaces to consume the functionality

Hiding the unnecessary things and revealing when it needs

Inheritance:

Reusing parent class variables and method along with child class variables and methods will be used while creating the child object is called "Inheritance"

Base class

Derived class

Base class: The class which is allowing others to inherit fields or methods is called "Base class"

Derived class: The class which is inherited fields or methods from other class is called "Derived class"

What is the use of Inheritance:

Using Inheritance concept reduce the development time and better maintenance

Polymorphism:

Having multiple forms

To ability to appear in many forms

same operation may behave differently on different classes

We have two types

• Compile time polymorphism(Method overloading)
• Run time polymorphism(Method overriding)

 Method Overloading:

The methods with in the class can have the same name but different in their parameter list and return type

Ex: class A

      {

         public void Add()

         {}

         public int Add()

         {}

         public void Add(int x)

         {}

      }

Method Overriding:

If a method of parent class redefining under its child classes with the same signature

Ex:

class BC

    {

        public virtual  void Display()

        {

            System.Console.WriteLine("BC::Display");

        }

    }

    class DC : BC

    {

        public override  void Display()

        {

            System.Console.WriteLine("DC::Display");

        }

       

    }

    class Demo

    {

        public static void Main()

        {

            BC b = new BC();

            b.Display();

            DC d = new DC();

            d.Display();

            BC  dd = new DC();

            dd.Display();

            Console.ReadLine();

        }

    }

output :

BC : Display

DC : Display

DC : Display

Without Method Overriding

BC : Display

DC : Display

BC : Display