OOPS Interview Questions and Answers | Object Oriented Programming Interview Questions C#

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150 C# Interview Questions & Answers videos - www.questpond.com/c-interview...
This 1 hour of video covers most asked Interview questions with answers around OOP Concepts -
00:00 Introduction
02:58 Question 01 :- Why do we need OOP?
06:47 Question 02 :- What are the important pillars in OOP?
09:55 Question 03 :- What is a Class and Object ?
11:01 Question 04 :- Abstraction VS Encapsulation ?
16:28 Question 05 :- Explain Inheritance ?
18:15 Question 06 :- Explain Virtual Keyword ?
18:15 Question 07 :- What is Overriding ?
19:30 Question 08 :- Explain Overloading ?
20:50 Question 09 :- Overloading VS Overriding ?
23:04 Question 10 :- What is Polymorphism ?
23:53 Question 11 :- Can Polymorphism work without Inheritance ?
24:43 Question 12 :- Explain Static VS Dynamic Polymorphism ?
26:32 Question 13 :- Explain Operator Overloading ?
27:18 Question 14 :- How to do Custom Operator Overloading ?
30:16 Question 15 :- Why do we need Abstract Classes ?
34:10 Question 16 :- Are Abstract methods Virtual ?
35:27 Question 17 :- Can we create an instance of Abstract Classes ?
35:27 Question 18 :- Is it compulsory to implement Abstract Methods ?
36:44 Question 19 :- Why simple base class cannot replace Abstract Classes?
38:51 Question 20 :- Explain Interface and Why do we need it ?
40:11 Question 21 :- Can we write logic in Interface ?
40:11 Question 22 :- Can we define methods as private in Interface ?
46:58 Question 23 :- To change Interface what's the best practice ?
47:07 Question 24 :- Explain Multiple Inheritance in Interfaces ?
51:08 Question 25 :- Explain Interface Segregation Principle ?
53:09 Question 26 :- Can we create instance of Interface ?
53:33 Question 27 :- Can we do multiple inheritance of Interface ?
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16 май 2024

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@questpondvideos 2 года назад

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@digital.voyager Месяц назад

C# 8.0 supports interface implementation methods, including default interface implementations, which allow you to add new members to a public interface without breaking existing implementers. I am little bit confused that why this change was made. @questpondvideos Could you please explain?

@jaym4358 2 года назад

Wow. I did not even notice the 1 hour pass by. This is the best interview prep and the best video that explains OOP concepts by far! Thank you so much.

@jaym4358 2 года назад

I had 3 technical interviews today. One of them had very heavy questions on OOP concepts. The interviewer loved my answer about what an interface is, and even admitted that he had a hard time grasping the concept earlier in his career. I passed that interview thanks to this video. I am moving on to the third and final round.

@Father_Of_Sudeera_Muthusinghe Год назад

@@jaym4358 Congratulations!!!

@pranav288 Год назад

@@jaym4358 How was the final round ?

@theav.1313 2 года назад

Thank you! I’m so glad you’re showing real time coding examples while explaining each necessary details. I’m learning a lot from this video. I can’t wait to watch your other videos! Thank you!!!

@nikhilkohirlyakaji 2 года назад

This video has cleared my biggest confusion related to Encapsulation vs abstraction which I have been facing for over 5 years now. Thanks

@sridhargana155 Год назад

An abstract class allows you to create functionality that subclasses can implement or override. An interface only allows you to define functionality, not implement it. And whereas a class can extend only one abstract class, it can take advantage of multiple interfaces.

@phelipepalte Год назад

Another difference between abstract class and interface is you can't do a dependency injection with abstract class..

@X3sView 9 месяцев назад

Latest version of c# allow interfaces to provide default implementation

@bosegeorge1425 4 месяца назад

@@phelipepalte actually you can.

@dominiquez5643 9 месяцев назад

Master class! Wow 20+ years developing and at last somebody explain things in a simple concrete manner! This is an amazing run down on OOP techniques properly exlained to be used and to answer questions from anybody in IT! Love this video!

@sunrise7442 Год назад

Best video's ive ever came across that explains concepts so easy. I followed the questions and enrolled on Udemy for the extra questions not covered here, and Cleared my first interview after 15min post interviewing I was called by HR that I got the Job🎉🎉 kudos to you Sir.

@stepbackandthink Год назад

You have explained this far better than actual training videos.

@dequanjabooty7379 2 года назад

IMO, your c# (and other) videos are some of the best on RU-vid. They are very helpful. I plan on ordering your courses on your website. Thank You

@automationselenium1331 2 года назад

By far the best video on C# interview I have seen on youtube, how one hour passed I have no idea, your way of teaching is amazing and I can watch your videos for hours...thank you and god bless you.

@natnaelhabtamu2799 Год назад

THIS is GOLD, you can easily follow up with any OOP language. thanks sir 🤗

@raoadnan442 2 года назад

Awesome way of describing. I have been searching OOP interview question answers but unable to find a great teacher like you. Hurrah.. now I have. Love from Pakistan. Keep doing this great job.

@fernandod3510 Год назад

You have a real talent for education and clear explanation. Thank you for all you have given.

@anshulasri152 4 месяца назад

Answer to a question asked at last "Difference between abstract class with all abstract methods and and Interface" is that although both are technically similar but at the time of multiple inheritence abstract class fails, for multiple inheritance we have to implement Interface only. Also I would like to thank you for the video that explains concepts so easily with code examples!

@omarcollazo5011 3 месяца назад

This is the best explanation of abstraction vs encapsulation that I've ever heard. Thank you, sir!

@vaibhavraj581 2 года назад

Very intuitive and clear explanation of the concepts , thanks a lot for sharing. Looking forward to learn more from your videos.

@vinothrajendran858 2 года назад

Sir, I have suggested your videos to nearly 20 people(my friends and colleagues) who were all trying for their next job and they found your videos really helpful. we are forever grateful. Thank you so much :) . And I will keep spreading your channel videos.

@danyahsan3958 5 дней назад

did you get the job

@hemantvitthal3732 2 года назад

Aftter many year (10 years) search on google or youtube, I found best programming concept, What I exactly needed. Thank you @Questpond.

@judycariaga3945 2 года назад

You really great at explaining it. Now I understand the OOP more. Thank you so much. ♥️

@mariahaamir171 Год назад

Its really underrated channel; I my opinion its by far the best. I am following Questpond since 7 years

@chanauria 2 года назад

I love your video! Very well explained! Keep it up!

@binayashrestha4131 2 года назад

Best OOP explanation video in RU-vid !

@gametechtutorial4670 Год назад

Best video so far. Clear, right at the point. Im getting the point right away. Thank you for sharing the knowledge sir.😃🙇‍♂

@Father_Of_Sudeera_Muthusinghe Год назад

One thing to notice... When we are talking about method "overriding vs overloading", we should emphasize that method overriding is a runtime polymorphism and method overloading is a compile-time polymorphism. I guess it will be an expected answer in an interview. Finally, thanks for this interview question video. It helps me a lot to gain self-confidence before going to interviews.

@KathakathanKarya Год назад

Yes. Also we should talk about method signatures.

@priyeshdubey40 Год назад

but here is the catch he also told that without inheritance polymorphism will not work but you see overloading case which is example of compile time polymorphism is not following the inheritance thing ..I think he confused little bit.😉

@Father_Of_Sudeera_Muthusinghe Год назад

@@priyeshdubey40 yup. U r right. In the comment section he has accepted the mistake. Anyway a great video.

@gazalkaintura2605 Год назад

@@priyeshdubey40 exactly I thought the same thing

@hakeemshodimu1956 Год назад

Great prep, very concise and to the heart of the matter

@benedictmabanga5736 Год назад

Best explanations! Thank you for this🙏🙌

@lehcyllehc Год назад

Thank you for this. I know you put so much effort and I gladly appreciate it. The way you explain each questions are easy to understand. I subscribed and liked this video. Looking forward to all your videos. :)

@dorothyfung5605 Год назад

Thanks very much for preparing and explaining stuff in such clear and organised way! :)

@PabloMartinezfr 2 года назад

Best OOPS Interview Questions and Answers on RU-vid!

@izmar47 Год назад

Thank you for the lesson. I can't tell you how much this helped. I appreciate your effort. Liked and Subscribed!

@naseerhussain5272 Год назад

This is the Best Explanation one could have asked for

@Devdumplings 2 года назад

This is the best one compared any oops languages. Having come from a different language background finally I understood what exactly the concepts clearly and thanks for being realistic about the preparation importance as I was a unprepared hero 😂

@rajeshmacpant Год назад

Excellent. This is such an easy refresher or explanation of OOPS concepts.

@vidyamahathi6057 Год назад

I got a job.I just watched this video for oops concepts 😁

@deepz513 Год назад

thank you sir, along with deeply explaining the concepts you are valuable advised is much appriciated.

@EdisonSeas 9 месяцев назад

Great video, for understanding OOP concepts not just for C# but also any other language even if they don't support them, (like JavaScript). Pura vida!

@shivamsoni4215 Год назад

Thank you for making simple topic complicated ♥

@mahinatarajan4232 Год назад

Hi Sir, Regarding Interface, should we follow the rules implied from C# 8 features? Because in C#8, we could provide access modifiers explicitly and it can contain default body implementation which can be accessed by up casting it.

@shivangisingh9920 2 года назад

You are awesome... Helped me a lot in the interview.

@seijumimurasakibara5516 Месяц назад

your dry wit coupled with your easy to understand explanations makes this video enjoyable to watch! thank you for this, i've finally understood the difference between abstraction and encapsulation and learned couple more things as well. Please keep up the good work!

@questpondvideos Месяц назад

Thank You :)

@lavanyaguniganti1444 2 года назад

Sir, I have cleared my interview in reputed MNC just by going through your interview videos. thank you so much

@rangababupolavarapu517 2 года назад

Do you have more interview questions

@questpondvideos 2 года назад

@@rangababupolavarapu517 you can visit www.questpond.com/interview-questions---answers-tutorial/cid63 for interview Q&A videos

@nalinikantadash8669 Год назад

An Interface contains methods which are by default abstract.But as an abstract class is a partially defined parent class so there is a possibility that it can contain both abstract methods as well as non abstract methods.This is the basic difference between an interface and an abstract class.

@saravanansangeetha1206 2 года назад

Very very useful video for us, appreciate your efforts

@vedantkulkarni5437 6 месяцев назад

One suggestion to viewers....don't skip this video just because you are using different language other than cs....it is one of the best video for oop with proper explanation

@hirajabeen9681 Месяц назад

I am here to recall my concepts and I have seen lots of material pdfs , YT vids and consult with books as well but this video I must say is so accurate and totally concise and delivers exactly what anyone need ! Much Appreciation for you ! Hatts off to your Efforts ! More Power To You ! @Questpond

@questpondvideos Месяц назад

Thank You 🙏

@kingfisher3791 Год назад

What most anyone can say about this video, it is really awesome. After seeing this i come to know what the purpose of oops concepts

@unknownfacts1197 2 года назад

Multiple inheritance is what makes interface and abstract class differ from each other when they become technically similar

@questpondvideos 2 года назад

So right. Thats the only BIG technical difference

@unknownfacts1197 2 года назад

@@questpondvideos Thank you.. Your explanations are so good sir 👍

@SSSALLJOBSPORTAL 2 месяца назад

Wah!! What an explanation boss!! Crystal clear explanation... 🙌 really thank you🔥

@ShankarV-te7le 9 месяцев назад

Simply superb explanation...thank you @Questpond.

@praveenrajubattula701 2 года назад

Good video. Just 1 correction - interface can contain implementation, which was implemented in c#8.

@yilienchi5380 2 года назад

I like APIE concept! That's pretty helpful! Thank you so mcuh

@renetam830 2 года назад

Thanks for the video, it was very helpful!

@manpreet.mg16 Год назад

You have done great video short and ans to remember in easiest way

@phanirao2008 2 года назад

wonderful, very crispy, specially example taken easy than domian specific

@kelpiekrisps Месяц назад

This was real great, thank you!

@abdullahahmed8468 Год назад

amazing content with clear and simple answers, Thanks alot

@the_ssr__ 2 года назад

THANK YOU FOR THIS VIDEO

@muhammadalikhanshirwany9378 6 месяцев назад

answer to the last question if later on they wat to add a new functionality or new method , in abstract class we cant use multiple inheritance but in interface we can .. i hope this is the answer.. thanks for your videos it helps allot. great work👍

@CALLMEMANISH82 2 месяца назад

thanks, very beneficial video to revise oop concepts.

@amamsharma372 2 года назад

Thanks you for uploading

@akshaysoren5400 10 месяцев назад

Thank you so much sir. i really like the way you explain.

@akashgupta2971 2 года назад

Huge respect for the efforts and time that you and your team have put, the sequence of the questions were very connecting and gradual... Now I have a better concept after watching the video... And for the question you asked at the end of the video... My answer is that abstract classes can be partially or not implemented whereas interfaces should be fully implemented.

@yosiosibemekun2785 2 года назад

An interface only allows you to define functionality, not implement it.

@akashgupta2971 2 года назад

@@yosiosibemekun2785 yeah that's another difference

@shubhampanwar7647 2 года назад

very very detailed and good quality video. i watched till question 27

@triloksingh1579 2 года назад

Hello Shiv Sir You are great

@justiceeziefule9308 Год назад

This is well explained. Thank you bro

@jankichalise904 Месяц назад

I always knew the theory part but when it comes to interview every interviewer was like what's the practical implementation of it and i really found the answer nowhere. thankyou so much for taking efforts and making an awesome video

@moldovandorin6187 Месяц назад

the difference between abstraction and encapsulation doesn't make any sense to me

@sadakagaja 2 года назад

Awesome sir It helping me to learn C#❤️

@yogeshbrahmane4200 8 месяцев назад

You are Best Sir !! Really very helpful

@AhmedAdel-xg1cm Год назад

Very intuitive and clear explanation of the concepts , thanks a lot for sharing. hope u will make a video for solid principles

@sarithakotha4138 Год назад

Thank u so much… This is so helpful for me

@godwinchalz4863 Год назад

best video for oops in C#

@keerthanasaiprasad6631 Год назад

Love this video! Could you make one for Java Core Interview questions?

@alexandraweaver9811 2 года назад

Such an informative video!! Thank you so much, I feel very prepared for any future tech interviews.

@RAHULYADAV-ck4vk 2 года назад

Thnku Shiv sir🙏

@mahydulislam 6 месяцев назад

thankyou so much for your nice explanation

@lekhrajawasthi8272 5 месяцев назад

Thank you shiv sir for this easiest explanation. Answer to that last question is that : Abstract can't help in multiple inheritance but the Interface can do the multiple inheritance. So in case of any modification to the requirement one can easily modify interface by implementing multiple inheritance.

@legendgattu 2 года назад

Abstraction is exposing only whatever is necessary outside a class. Encapsulation is binding data and behaviour (methods) together.

@nagaboddu852 13 дней назад

Thank you sir , it’s very useful 😊

@durgaprasadgarapati1748 2 года назад

Waiting for this video sir thanks for sharing

@AzeemRaavi Год назад

Awesome way to answers the OOP questions. Love from Pakistan 🇵🇰

@ankursahani8564 2 года назад

Sir your explanation is very systematic. Sir please upload Question and answer for top 50 C programming coding Question for fresher interview.

@manjuanoop7239 Год назад

Excellent material thanks for sharing such an informative video👍🏻

@vagatsinghrathore1756 8 месяцев назад

Really awesome, thank u so much 🎉

@panic_seller 9 месяцев назад

Very good video, never paid attention for 1 hour in a RU-vid video

@gopavarapuguruprasad 9 месяцев назад

One of best video about oops concepts interview question and answers I come across. Please keep up good work sir👍.

@Shubhamkumar-ir5ox Год назад

Thanks Sir. Much more Appreciated.

@mohamedmusthafa1057 Год назад

I find this Channel You saved My lot of time thanks ❤

@husnainmazhar6739 2 месяца назад

amazing video,, cleared all the concepts.. Thanks

@AndreiChmelev 8 месяцев назад

I would like to clarify the issue of the difference between abstraction and encapsulation. Maybe I misunderstood the author. All the time I explained these terms to myself like this: - abstraction is the selection of significant information for our situation. That is, my program from an employee, for example, needs his first name, last name and other data, and I do not need the color of his hair or the size of his feet. We take only that very small part of the information from a real world object that we really need. - encapsulation - grouping data and functions that work with data in one structure - an object. That is, we encapsulate data and behavior in an object. Access modifiers, it seemed to me, had nothing to do with it. There are object-oriented languages without access modifiers and the principle of encapsulation is used there. Access modifiers are more related to the term Data Hiding. Guys, correct me if I'm wrong.