Part 33 - C# Tutorial - Difference between abstract classes and interfaces.avi

Best teacher, what I am today is due to your helpful materials. There was a time when I got my degree I tried a lot to get easy materials to help me in getting a job but remained jobless for a long time. But I continued struggling for getting a job, one day I got these tutorials and soon after 2 weeks I got a job. Thanks a lot sir venkat, you are really a professional teacher.

Interface class only contains non-implemented methods while an abstract class can have field members, implemented methods, and non-implemented methods. Interface class is a contract where the inheriter agrees to implement the methods and an abstract class is an incomplete class that can't be created and only inherited from.

Now after c# 8, even interface can have method implimentation.

But sir.. Interface can have access modifiers and can have implementation as well.
Below code worked.

interface Itest1
{
public void iprintf1()//explicit access modifier
{
Console.WriteLine("Hello World in interface 1");
}
}
class clsNew : Itest1
{
}
class Program
{
static void Main(string[] args)
{
Itest1 oItest1 = new clsNew();
oItest1.iprintf1();
}
}

Hi Venkat! I know it's been long since you've made this video, but I'm commenting this now: Please rectify if I'm wrong. I think in current version of dotnet(6), we can also create complete method definition inside an interface, which eliminates this key difference between an abstract class and interface.

Even we can add "public" before a method definition in an interface and the compiler won't throw an error at compile-time

Good video thanks, just so quiet....

14 april 2021

He should arrange a meetup. we want to meet him. Hes is so crisp and clear , he even corrects his grammar.

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But now in C# 8.0 we have interface having implementation for its members. And many more additional features.

you are a LEGEND.

please english subtitles....

Interfaces can have properties though. You should mention that

Good job in explaining the concept

sorry , but on c # v 8 Interfaces Can Have Implementation

So an Interface can only have a method's declaration and name but no function or data.
And an abstract class cannot be inherited or gotten multiple times by the same class, but an abstract class CAN inherit from another abstract class.
Thus to combine multiple abstract classes you simply make them inherit each other, thus the final class gets the functionality of all the abstract classes.

When to use Abstract Class and When to use Interface ?

Can anyone tell me why Interfaces and where we using it in real time?

Can u explain the third point in detail ...

Hi Venkat,
I have been asked so many times a question in Interview that-
In which case we should go for abstract classes and Interfaces?
Please help me.

Really helpful.Great work

Sir plz explain encapsulation vs abstraction with example, Having seen so many videos I got confused.

And the constructor :D

thank u

Hello Sir Thank you for explaining so good.
You didn't tell about usage of abstract or interfaces in real time project.
why wo we use it.

Thanks buddy, your all video very useful for all developer.

Interface only inherited by interface? Then where will be the implementation of interface members?

I believe, unlike in C#, in Java, an interface can have field. Right?

This is such a great teacher and brilliant series. I have learnt so much from your videos! Thank you so much.

Thank you that helps me alot to understand what is the difference between Abstract and interface.

How can an abstract class inherit from another class or interface when it is always a base class

why would u have a method that is not abstract in an abstract class ?

you are the best

You're The Man!

Can anybody please tell,,,,, Abstract class can have implementation for some of it's method.. May i know in which case it will not have implementation for any of it's method....

(1)Use an interface to design a polymorphic hierarchy for value types.
(2)Use an interface when an immutable contract is really intended.
(3)A well-designed interface defines a very specific range of functionality. Split up interfaces that contain unrelated functionality.
(4)Use interfaces to introduce polymorphic behavior without subclassing and to model multiple inheritance—allowing a specific type to support numerous behaviors.

I dosent understand that above lines.
can you please try explaain me in better way??
with example?
Thnak's

Thank you Sİr

Thank you Sir

sir , an interface can inherited by non abstract class

Venkat, you said Abstract class acts as a base class!!! Then How this point from your slide is possible...?
ABSTRACT CLASS CAN INHERIT FROM ANOTHER ABSTRACT CLASS OR ANOTHER INTERFACE.... My Doubt was, how can any class can be a Base class when it is inheriting from another Abstract class or interface??? Can you please let me know

Hello venkat,
Can you please explain any real world example of when and where to use interface and abstract class. Also can you please explain dependancy injection.

Thanks

really really  ur teaching is very helpful thanks so much

Please upload a video on sql execution plan.

Keep in mind that since Java 8 you can implement interface methods with the 'default' keyword

"abstract method Must be implemented" is the case when an abstracted is inherited. Is it the same when an interface is inherited and "all the methods should be implemented"? Is it mandatory to implement all the methods of interface as that of abstract class? Thankyou

wow what great video :-)