OOP 3 | Principles - Inheritance, Polymorphism, Encapsulation, Abstraction

Important video for OOP interviews! The complete and in-depth explanation with real-world examples of #OOP principles such as Inheritance, Polymorphism, Encapsulation and Abstraction.
A detailed explanation of overloading vs overriding, encapsulation vs abstraction vs data hiding, types of inheritance and more!
Complete OOP playlist: • Object Oriented Progra...
Take part in the learning in public initiative! Share your learnings on LinkedIn and Twitter with #DSAwithKunal & don't forget to tag us!
👉 Resources
- Join Replit: join.replit.com/kunal-kushwaha
- Complete Java DSA playlist: • Java + DSA + Interview...
- Code, Assignments, & Notes: github.com/kunal-kushwaha/DSA...
➡️ Connect with me: kunalkushwaha.com
=========================================
0:00:00 Introduction
0:01:15 Principles of OOP
0:02:26 Inheritance
0:11:30 Example: Box
0:17:49 Explaination
0:23:31 "private" keyword
0:36:26 "super" keyword
0:48:00 Single Inheritance
1:00:17 Multiple Inheritance
1:04:25 Hierarchial Inheritance
1:07:28 Hybrid Inheritance
1:10:26 Polymorphism
1:12:53 Example: Shapes
1:19:27 Types of Polymorphism
1:19:57 Static Polymorphism
1:20:34 Overloading
1:28:02 Dynamic Polymorphism
1:29:24 Overriding
1:34:08 How Overriding Works?
1:39:05 How Java determines which method to run?
1:45:17 "final" keyword
1:50:49 Can we override static methods?
1:57:02 Encapsulation
1:58:22 Abstraction
2:00:14 Encapsulation vs Abstraction
2:05:33 Example
2:09:33 Data Hiding
2:11:47 Outro
#placement #dsa #interviews

[@shubharawat9023]

Your OOP series helped me a lot in my Adobe interview. I answered the Qs in the same way you have explained in the video. Abstraction vs encapsulation, compile time polymorphism vs run time polymorphism, and so many more that you cleared in this video. And I got the intern offer from Adobe. So thank you very much. I owe this to you. Keep up the good work.

[@KunalKushwaha]

Congratulations!

[@shubharawat9023]

@@KunalKushwaha Thank you!!

[@NiteshSingh-bv9lu]

@@arjav7 you give me linkedin profile

[@dhruvbhatia5737]

On campus or off campus?

[@pratiksoundarkar]

Kunal Sir salute for your teaching

[@karthikp6473]

An hour of kunal's course a day, keeps unemployment away 🌚

[@ashishandhavarapu8779]

💯

[@aaryansj8016]

😂😂😂😂👍

[@adbhuthareddy]

🤣😂😅

[@dnyaneshwarichatarkar6446]

💯💯

[@sarthakpanda7838]

bhai placement ho gayi???

[@ayansiddiqui7383]

1:55:30 "You can inherit but you cannot override, You can run but you can't hide" ~Kunal kushwaha (2021)

[@himanshuchoudhary2514]

bro i understood this line "you can inherit but you can't override . but i didn't get this line "you can run but you can't hide ??? what's meaning of hide here ?? can you explain me ??

[@vaishnavisakhare681]

You can run from OOP but can't hide 😂 Best playlist for OOP .Thank you for keeping this playlist free❤️

[@KunalKushwaha]

You're welcome!!

[@himanshuchoudhary2514]

bro i understood this line "you can inherit but you can't override . but i didn't get this line "you can run but you can't hide ??? what's meaning of hide here ?? can you explain me ??

[@VijayKumar-zi3km]

I have bought a very expensive paid course for DSA and Java. Let me tell you, the course I have bought is no way even closer to what Kunal is teaching in this bootcamp. Can't thank him more. More power to Kunal. Please keep continuing the good work.

[@ushamartin5863]

which course have you bought?

[@MrVrtex]

@@ushamartin5863 Probably the aman dhattarwala course

[@neeleshnitt]

ye cheeze poochni nhi hoti@@ushamartin5863

[@arimallick]

"You can run but you cannot hide, you can inherit but you cannot override" 🔥

[@himanshuchoudhary2514]

bro i understood this line "you can inherit but you can't override . but i didn't get this line "you can run but you can't hide ??? what's meaning of hide here ?? can you explain me ??

[@rakeshbabu4790]

I have never watched videos of this much duration but after I started your course ...first I check how much duration it is and more duration it is the more I am happy...

[@bhargavbhargav5768]

I was struggling with java and OOP previously. Previous two videos really helped me a lot and now continuing with the third. Thank you❤🙏

[@KunalKushwaha]

You're very welcome!

[@adityasiddhapura8156]

"you can run but you cannot hide, you can inherit but you cannot override" 🔥🔥🔥

[@himanshuchoudhary2514]

bro i understood this line "you can inherit but you can't override . but i didn't get this line "you can run but you can't hide ??? what's meaning of hide here ?? can you explain me ??

[@DHRUVSARASWAT-yy4jx]

It means that anywhere you will going you can't hide yourself with people around you​@@himanshuchoudhary2514

[@Aditya.Rawat45]

When you said in the first few videos of this playlist ,that this is the best and the only playlist that i need,i was like,i dont know why is this guy so overconfident about this.. But now,i just cant explain how true those words were... Nobody is even close to this playlist, literally the best way of teaching, best explanation and all these things for free. Hats off to you man

[@rajendrabrahmbhatt2585]

The more my College professor teaches me OOP the more I value you, you are a God for putting this material publicly, otherwise you could make this course paid and ask as much as you want to. This course is the best thing that ever happened to me. Please keep making videos. I will meet you some day if I get lucky enough.

[@gamingwithnsk3610]

Everyone knows therotical explanation of oops concept but you are explaining the practical use and easy way of understanding about oops concepts. Thank you so much keep posting videos ☺️

[@hariaseri6071]

This is most awaited courses for me . Giving such kind of contents without any fee is seems impossible but dude you , you just made it possible bro . Thanks a lot bro .

[@bhargavisingh2932]

Unparalleled!! This playlist is literally all we need.

[@david99WTF]

This course is awesome. I am so glad I found this channel when I was searching for OOP videos. Can't thank you enough for the content you are providing.

[@PavanKumar-tt6tw]

Iam really grateful to you. I never thought understanding OOPS is this easy. Have no clue on what I would be doing without your videos.

[@anmolverma075]

You can run but you cannot hide, You can inherit but you cannot Override. Very deep.🎇

[@himanshuchoudhary2514]

bro i understood this line "you can inherit but you can't override . but i didn't get this line "you can run but you can't hide ??? what's meaning of hide here ?? can you explain me ??

[@krithikagandikota8582]

I'm not usually someone who comments down yt videos but this truly deserves one! The best part about this Java playlist is that it makes you enjoy learning Java,I've probably watched the oops playlist 2-3 times and I've only enjoyed it each time, revising concepts additionally! My love for Java , I definitely owe it to this playlist!

[@KunalKushwaha]

Glad you liked it!

[@PradeepYadav-fg2yg]

2:11 am in the morning still binge watching the playlist and tweeting😂❤️

[@tirakv]

Let's go! third lesson COMPLETED! Thank you Kunal, you're an amazing teacher!

[@reekdevray4776]

Hey Kunal, can you make a video on how you study a topic? Like something that you absolutely don't have any idea about as a beginner - how do you go on about learning it? This is just something that I've been curious about since a while because your explanations are so to-the-point and clear to understand.

[@RaviSingh-ij1yk]

when I started oops from part 1 I got confused between many things but when I reached at Oops part 3 my all the previous concepts and doubts get cleared. Thanks a lot.

[@keshavtiwari1632]

A really good thing about you teaching style and the content of this playlist is that, it is giving me the momentum to learn. In my experience, even a extensive and detailed tutorial and playlist can't help you, if you are not self motivated to see the entire thing. The first few videos of your playlist, and I was hooked to your playlist. So thankyou for such great content.

[@tusharlokhande4544]

I was totally confused when my teachers at college teach me abstraction and encapsulation, now my concept about this topics is totally cleared. Thankyou ❤❤

[@KunalKushwaha]

Happy to help!

[@syedusman3324]

@Jaivardhan Singh Im an employee and this is helping me , so you have the answer

[@ishitasingh6014]

The explanation of method overriding was phenomenal and the answer to the question why static methods cannot be overridden? This is because overriding is related to objects . Methods and variables when declared static have no relation with objects. So method overriding is not possible in static methods. Kudos to you and congratulations to us for receiving a great content.

[@kalpeshmali1476]

I'm pretty sure i will be confident after watching your lectures 🔥 thanks man

[@hridyeshhh]

I used it to revise my concepts but I ended up learning more than what I knew before, thank you Kunal sir :)

[@sairamkurmadasu9360]

After watching kunals OOP explanation, no fear at all. Really helpful and you covered literally all the concepts. In fact more than anything. Thank you so much for making and coming up with such amazing content. No1 channel for learning DSA Java.

[@kakumanusavithri8613]

This OOPS series is just amazing!!!!!❤

[@aritrachatterjee147]

Finally after a long wait , but the wait seems like worthy after seeing the video quality ❤️

[@Lukas-mq9em]

Thank you so much for this series Kunal. I'm about to start my CS Degree and this Series is helping a lot to get the basics together!

[@sadhnasuman941]

Can't thank you enough for clearing concepts by going in such minute details...you are a saviour!!❤🤘

[@akshaytakrani6886]

Each and every doubt that I had previously in OOP has been cleared after watching this video. Literally explained everything in such a simple manner. More power to you Kunal ❤️ P.S. - You can run but you can't hide, you can inherit but you can't override ( Static methods )

[@KunalKushwaha]

Glad it helped!

[@saikishoremanthri5158]

@akshay takrani hey can you tell me, Is this OOP only for Java or c++ programmers also wacth this ?

[@venkatasriharsha4227]

@@saikishoremanthri5158 concept is same for any OOPL

[@saikishoremanthri5158]

@@venkatasriharsha4227 😊thanks

[@saikishoremanthri5158]

@@venkatasriharsha4227 🤔is DSA is also same for all languages,( like C++ and java)

[@vanshjain5960]

You can run but can't hide -- -- you can Inherit but Doesn't Override (*Static Functions) Great Lecture Kunal

[@koustubhpal9366]

Thank you, Kunal, for teaching all these concepts in such a simplified manner.

[@rambabupatidar3092]

Really the best videos of the OOPS. not a paid course can come closer to it. more power to you kunal.

[@gourimmenon2726]

"You can inherit, but you cannot override" 🧘🏾‍♂️

[@yashkoolwal196]

this time also worth watching the whole video. Also the videos are so interesting feels like story telling and boom you've understood the whole concept

[@_faisalkhan_10]

I am joining my 4th sem and very near to internal after a long bunk still I have the confidence to score better than others in this subject.A very whole heartedly thanks to Kunal Brother❤❤

[@velammallakshmi3891]

Have never been in mindset that "oops" is so easy to understand and learn.Thanks man❤️

[@crispyclips2916]

"You can run but you can't hide, You can inherit but you can't override" - Kunal kushwaha Ye sahi tha guru

[@himanshuchoudhary2514]

bro i understood this line "you can inherit but you can't override . but i didn't get this line "you can run but you can't hide ??? what's meaning of hide here ?? can you explain me ??

[@yeswanthh5068]

Your style of making hours of content in one video is what I really really like plss keep it up🙂🙂🙂🙂

[@thanujanandaraj7424]

Holy moly. I felt really hard to grasp knowledge on OOP programming but after watching your playlist I now understand the whole OOP concepts. I do have a couple of other doubts(like small doubts) but as I code more and more I will eventually learn more. Thank you so much for your help. God bless ya and keep up the good work bro : ).

[@KhushbooDhingra]

You can run, but you can't hide. You can inherit but you can't override. Love the way you teach.!🤜🤛

[@zulfiqaribraheem7175]

A message of appreciation from otherside of border. Keep teaching, keep shining and keep spreading love

[@KunalKushwaha]

Thanks a ton

[@anutharak3766]

Great lecture Explanation of polymorphism & Encapsulation was really awesome 👍❤️ Thank you Kunal

[@kameshsingh9402]

Your youtube channel is goldmine for me and also your teaching ability is best brother. No other paid course's are near to this tutorial of oop's concept.

[@notknowthething]

Kunal Kushwaha has brought another great content. Thanks for this. Object Oriented Programming

[@mdashfaquemarch]

Thanks for this amazing course ❤️

[@vineethkalewar1133]

this might the first time i completely understood the 4 basic principles of OOPS. Great video

[@KunalKushwaha]

Glad you liked it!

[@aditya__exe]

Loved the video! Starting from the very basics and taking it to advanced, you've covered everything.

[@ropurifiedwater]

Really happy that i was able to watch the complete video and get to know so many things from you, i cannot thank you enough for making such great videos for the community kunal bhaiya!! so thank you once again :)

[@Amit-zu9id]

This type of playlist is really a game changer for placement journey of every student.. keep it up!! and thanks for this 👍😊

[@sheshankmahipal9970]

This video made my concepts crystal clear. Keep up the good work bro!👏

[@KunalKushwaha]

Glad it helped!

[@whatwhat3435]

what i like about his videos is every time i say i knew this , he teaches new thing to me literally every time in every videos

[@himanshuchoudhary2514]

Literally Kunal i don't have words the way you teach its just amazing fun we are not studying we are enjoying

[@Window2015]

Personal timestamp: Day 1) 2:26 Day 2) 48:00 Day 3) 2:12:51

[@raktimghosal4562]

I think I could teach my teacher object oriented programming in a higher dimension than what they know of. Keep up the Good Deeds. 🔥❤️🔥

[@KunalKushwaha]

Wow, thanks

[@Kapil-1999]

Best Explanation of OOPs concepts available on KZbin is this video. Actually I know the concepts prior to watching this, but it has made my understanding much more strong. Really liked the way he explains. 🔥🔥🔥

[@ankitshaw_3060]

Hey , kunal first of all thanks for such an amazing course ...but @ 1:21:11 you said that we can do method overloading by changing the return type also...but when I was trying out it on my laptop it was showing error then I checked it on the Google and found out that we in java , method overloading is not possible by changing the return type of method only ,so I just wanted to correct this point .

[@piyushbhatia5374]

yes , i am facing the same issue regarding the method overloading . @Kunal Kushwaha

[@nikhilsoni272]

He's keeping SQUID GAME in mind while explaining polymorphism (Shapes are triangle, circle and square only). lol🤪

[@kishorekiu8327]

Watched many websites regarding OOP, certainly I could not get the clarity, started your playlist can't go off the topics from my mind. Worth watching it. really appreciable for giving us such a nice playlist.😍

[@shafaq-here]

Very Informative, I got to understand the difference between Abstraction and Encapsulation, Kunal really makes it simple to understand. It is very uncommon to see somone explaining difficult concepts with so simple examples. Respect.

[@Helly_Patel]

Thanks for teaching us like no one did till now!! One small request, please make lectures on dynamic programming as well!!

[@sidkumthekar4614]

really enjoying learning object oriented programming with you !

[@PawanKumar-jk1yy]

I knew about all these topics but still i watch because kunal always gives some beautiful insights !!

[@gokulanvs]

The way you teaching to make questions about the concept and to findout by ourselves is the way i wanted learn and you just presented that for me ❤thank you kunal kushwaha

[@user-db9dl7uf2j]

I have never seen someone explain much better than u bro u rocked it❤❤

[@anantkumar4370]

This 2 hours can answer many universities and colleges questions 🔥🔥🔥 Worth the time Thank you

[@mihai.samis.x]

We are lucky to have the most important concepts of OOP described to us in such an insightful way!

[@shanmukhachakrapani2433]

Way of teaching is awesome. Undoubtedly i can tell you that you revolutionized java through this playlist.Kudos.

[@realityteller0980]

Best Explanation on difference between Abstraction and Encapsulation I have ever seen, Thanks Kunal!

[@MrVrtex]

51:00 "Try it yourself, Experiment orelse you will never understand how it works" Perfectly said. I learned everything by Experiment. I learned about hashmaps, arraylists, linked list all by Experiment. I never watched your videos before. But off course after I watched your videos it got more clearer. I never learned about linked list. But in my first question in leetcode of linked list, I tried it myself and eventually got the idea of how it works. Now I have almost solved 30 to 40 linked list questions in leetcode (mostly medium). Still I haven't watched any linked list lectures. (Eventually I will 😅)

[@afridahamed3343]

Explanation is on a different level 🔥 Thank you Kunal !

[@Rik-jl5dc]

Great Video! I never thought such confusing topics could be explained with such clarity. Thanks a lot for your efforts❤

[@piyushsolanki9941]

This playlist is the best OOPs playlist i have ever seen , never thought of oops concepts like this.

[@bandhanmajumder-kx7tp]

Just loved it! Feels like I am doing post-mortem of OOPs. Really enjoyed. Thank you!

[@nalinkhanna3318]

"You can run but you can't hide , you can inherit but you cannot override." Loved the video ❤ Thank you for clearing my concepts. Each and every concept is overfitted in my mind , such a great explanation 👏

[@meetpatel7153]

You can binge watch this series. Great work and thanks.

[@bhavyasoni6791]

❤you are telling the concept in very basic terms and real life example to understand the concept very well . thank you for this oop series.

[@agyaani8060]

Best video available on OOPs on whole KZbin is this❤❤...Thanks kunal❤✨

[@DeepaKGuptA-rm9wx]

Your teaching style is awesome, you never leave a bit and put all the efforts so that anyone can understand the topic. There is a request, please make videos on "SYSTEM DESIGN PATTERNS" as well.

[@ritwiksingh5311]

dude studying from gfg and you videos is really helping me , I'm getting confident day by day , thanks for these awesome contents , eagerly waiting for the more amazing videos ❤

[@mohammadmujtaba2151]

Very nicely explained Kunal ! . The video was very in depth + it made me always wanting for more whenever you finished a particular topic ! Keep up the good work !.

[@jayyy311]

Now I can say , I knew all about the pillars of object oriented programming. Thank You @KunalKushwaha

[@SumitSingh-iv2es]

kunal bhai op explanation . this type of explaining complex topics in such a simple way i can't see another one on whole youtube

[@annkitplays8925]

I had purchased courses from cb, cn but kunals oop series was just at another level..... Thanks kunal

[@saurabhpatil4746]

I never thought these inheritance and polymorphism concept would be that easy to understand . great work Kunal !!!

[@KunalKushwaha]

You’re welcome

[@pjitender5535]

Thank you for giving us the best experience in OOPS and keeping this playlist free.

[@subhamoysasmal8382]

polymerphisim part is the best part of this video and inheritance part also.thanks kunal for this deeper level of this oop concept

[@rosariobeck6254]

Hey kunal your videos& assignment keep me busy, dude your a BIG / HUGE HELP for learning DSA. Hey i recommend people check out this coures is better than any payed DSA you will find & THE MOST IMPORTANT it's beginner friendly.

[@ridoychandradey8337]

I have learned so many things about Inheritance from this video. It's really help me a lot.

[@SikhwalManish]

This is the great Video on the OOPs Concepts. Thankyou Very Much Kunal :)

[@shubhamvishwakarma1539]

I have bought paid course for Java and DSA. Even they are not explain in this much detail which Kunal is providing here. Each minutes of lecture is very important. It's best thing which you find on KZbin

[@068_gauravchakraborty]

Best explanation I have ever seen about Inheritance, Polymorphism, Encapsulation, Abstraction ❣

[@arkamaity7371]

Hey Kunal I am seriously thankful for all the lectures please upload videos on Hashing ,Tree and Graphs

[@Suman-ze8zz]

50:18 Real learning starts from here!!! Thanks Kunal, love the way you teach.

[@herhapppyyyface]

Thank you so much kunal for such awesome OOP playlist all my doubts are cleared ❤

[@ultron1060]

thanks for explaining these concepts without technical jargon and using simple language . it makes the concepts cystal clear .

[@mohdkaif4226]

one of the best java dsa course 😁😁 Each and every small topic cover in depth and i really love it😍