Intro to Object Oriented Programming - Crash Course

Learn the basics of object-oriented programming all in one video.
✏️ Course created by Steven from NullPointer Exception. Check out their channel: / @nullpointerexception
🎥 Introduction to Programming: • Introduction to Progra...
⭐️ Course Contents ⭐️
⌨️ (00:00) Introduction
⌨️ (07:37) Encapsulation
⌨️ (12:45) Abstraction
⌨️ (17:49) Inheritance
⌨️ (22:47) Polymorphism
⭐️ Sources ⭐️
🔗 docs.oracle.com/javase/tutori...
🔗 stackify.com/oop-concept-for-...
🔗 press.rebus.community/program...
🔗 stackify.com/oop-concept-inhe...
🔗 docs.oracle.com/javase/tutori...
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[@oxanasf6369]

Notes: Four OOP principles: Encapsulation: * Refers to bundling data with methods that can operate on that data within a class. * It’s the idea of hiding data within a class, preventing anything outside that class directly interacting with it. * Keeps the programmer in control of access to data. * Prevents the programmer from ending up in any strange or unwanted states. Abstraction: * Refers to the idea to only showing essential details and keeping everything else hidden. * The classes you create should act like your car. Users of your classes should not worry about the inner details of those classes. * This is very important when working on your program incrementally. Inheritance: * Is the principle that allows classes to derive from other classes. Polymorphism: * Describes methods that are able to take on many forms. * Allows methods to take on many different forms. * Be sure that you are calling the correct form of the method. * There are two types of polymorphism: ** Dynamic polymorphism: - Occurs during the runtime of the program. - Describes when a method signature is in both subclass and a superclass. - The methods share the same name but have different implementation. - The implementation of the subclass that the object is an instance of overrides that of the superclass. ** Static polymorphism: - Occurs during compile-time rather than during runtime. - Refers to when multiply methods with the same name but different arguments are defined in the same class. - The parameters are different type or taken in different order. - This is known as method overloading.

[@saranyasuresh527]

Thank you ❤

[@sarimdev]

Thank You : )

[@micksail3341]

Ok, Good Summary of OOP. Very Good Notes.

[@adiflorense1477]

Noted

[@udayy4448]

brudda take this like

[@nicolahcm]

Resume: 1) Encapsulation ----> Getters and setters 2) Abstraction --> We care about Interface. Not the implementation behind the hood. 3) Inheritance --> Extending classes... Access modifiers: public, private, modifier 4) Polymorphism --> Interface / Implements in Java ... Same methods' name, but different implementations of methods.

[@adipurnomo5683]

Inside polymorphism: overriding and overloading, right

[@janjeromesoriano1182]

@@adipurnomo5683 yes

[@janjeromesoriano1182]

@Hector Fontanez I agree

[@ysammo214]

Thankyou

[@ifeanyichukwuazuka3184]

Q

[@ayazulhaq4727]

I've been working for 6 years in the market and I can say no one has explained so simply as you did. kudos

[@valdemarvreeman8231]

I wonder why you haven't learned OOP in the 6 years you been in the market...

[@ayazulhaq4727]

@@valdemarvreeman8231 Who said anything about learning? I was talking about the way he explained. There is a difference, isn't it?

[@sultanakalsekar6800]

@@ayazulhaq4727 absolutely

[@kientran4818]

@@ayazulhaq4727 apparently he has issues with his reading skill.

[@maliha.ishtiaq]

@@kientran4818 hahahaha. savage reply...

[@smiley-wu1kn]

It's my first time actually watching a half an hour tutorial from start to end without closing youtube. Thanks a lot!

[@peterhimmelman9241]

Amazing descriptions of the 4 main principles of OOP. Thank you!

[@microman502]

The examples used are very straightforward and every concept is explained well. I haven't watched any video on OOP before, but this one will help me a lot to make better code. 10/10 video!

[@justincordero7797]

This was a great refresher for me. I like that the instructor speaks slowly so I can increase the video speed through sections I'm more familiar with and watch at normal speed when the information is a bit more unclear. Thanks freeCodeCamp!

[@as_below_so_above]

I really enjoy the use of the chess example. I think the chess example makes it easy to understand the kinds of constraints that are required for each object and method, as well as why those constraints are necessary for the game of chess to work properly. Great video!

[@j.rayscott4681]

This is excellent. My only suggestion would be to continue the chess example on through the whole video. Using the chess game analogy really helped me understand OO.

[@415423591]

Wow. Thank you for speaking so calmly and clearly! Big plus.

[@mayukakat1524]

Thank you for sharing this video. I have watched multiple videos on this topic on KZbin and yours is hands down the best I have seen. I just watched it the third time and and comfortable with all the concepts.

[@omarwaleed2320]

Extremely well-explained, I would love to watch more video like this one!

[@ChewingGum113]

Thank you so much for explaining!! It was very clear for me. I hope there will be a similar introduction for Functional programming, and also the pros and cons between those 2 styles of programming.

[@SGTrainingStable]

I tried to learn this material from a collect instructor and several textbooks in the past three years, but you explain cover this topic in a very clear, thorough, and concise manner that is easy to understand. I am so grateful to you for this presentation. You should seriously consider writing textbooks-I would be súper interested in reading them!

[@voltaire5427]

I'm only about 20% of the way through my first programing course and understood about 90% of the lecture. Very well explained even to a layman.

[@ajibadesamuel4578]

Just brilliant, you made it really simple. I have tried so hard to understand these concepts and now your explanations gave me a better understanding. Thank you.

[@candleby]

Not being a professional, I always had a vague idea what OOP meant but would have been hard pressed to explain it to anyone. Thanks to your excellent video I finally had the "aha-moment". Thanks very much, Steven!

[@alancoates]

This is an exceptionally clear explanation of OOP. Well done!

[@SourabhBishnoi100]

This is by far best explanation of OOP I have ever heard, Thanks :)

[@sesu6743]

Wow, just wow. I already have a bit of experience with OOP, this video helps me to refresh my understanding of it in just 30 minutes. This is great, thanks for making this!

[@jameshansen801]

Thank you so much for this course! It's so pleasing to listen to :)

[@Aviel777Gergel]

The examples r super clear. Absolutely recommended to watch!

[@melkenhoning158]

Newbies please listen before you end up like me! If the only language you know is Python, I urge you to learn C#, C++ or Java to actually understand how to implement this practically. Python is a great language but it abstracts a lot of important OOP concepts and it makes it extremely hard for beginners to understand why OOP is important. OOP is all about defining data before functionally, and python is very nebulous about its data.

[@experiment0003]

I agree. Going from Python to C++ and Java wasn't as smooth as I thought. Now, I don't see myself going back to Python (unless, of course, for occasional data science with numpy/pandas). Python => print("Hello World!"). Java ==> package > class > public static void > System out > ("Hello World!")

[@rubayetalam8759]

is it important for data science or machine Learning?

[@potatoes5829]

Good thing I started with c++

[@MarcusHCrawford]

@@experiment0003 Java: import Java.util.Scanner Class HeyThere { Public static void main(String[] args){ Scanner userIn = new.Scanner(System.in); String name = userIn.nextLine(); System.out.println(“Hello “ + name); } } Python: name = input(“Enter name:”) Print(f”Hey {name}) And don’t even get me started about how Java is case sensitive, that part drives me nuts.

[@experiment0003]

@@MarcusHCrawford I swear 🤣

[@jordycoder]

Thank you for sharing your creative way of explaining what OOP is. Awesome. helps me to become a better programmer

[@DipaLoka]

I've been working for 13 years in the industry and have studied many courses, and this is still probably the best description I have ever heard! Thank you

[@Serkan0kur]

Thank you for the informative video. It is a nice summary kept in 30 minutes with meaningful examples.

[@victoriateixeira9943]

Such a good video!!! Helped me understand concepts that I'd tried to fully understand before, but couldn't! Thanks!

[@haamithsulthan5858]

Loved the content. Subscribed. Hope the channel grows fast.

[@JZ1917]

This is great content! Clear and great density. Thank you!

[@TheTrace8]

Wow! This is educational video making at it's finest. Near perfection. I'm sure many viewers have tried to get these concepts clear elsewhere, and will finally achieve clarity here, like I am doing now after code school plus 2 years working in the field.

[@TheTrace8]

But as a guy who DOES appreciate the layer underneath the abstraction of a car, I'll add humorously: to think a sportscar has twice the fuel efficiency (using half the gas) of whatever a normal car is, is unlikely. Also, wanting to drive it a "double" of miles, instead of just an int... That's gotta be a very, very, very, very well made car. :) But, still, great video.

[@anyaozioma9583]

I can say you are one of the best tutor I have met, u take your time to explain, I also watched you tutorial on introduction to programming, it was 🤯. Well done 👍.

[@perianka]

please do a more advanced one! loved this

[@Vonaan]

This is the best explanation I've been able to find. I was creating my own first OOP application and was struggling to see the difference between a class and an object. This explanation via chess makes it so obvious that I wonder why I didn't get it in the first place. It's al about the chess example and the way you explain it. You have great presentation and tutor skills. Now I just need to start my application from scratch again. Please could you also explain the several UML diagrams based on this chess example? That would be a great way to show everyone how you can design your application with OOP in mind before even starting to code. It would have prevented me from making a lot of beginners and obvious mistakes.

[@tiktokhits7208]

Yeah thts true

[@connorferguson2351]

I’m just starting to learn programming. This is very helpful and the best explanation I’ve seen for a newbie.

[@splashbruda8211]

How's it going so far? I am starting myself, curious how much you advanced in a year.

[@i_am_dumb1070]

@@splashbruda8211 what about you how much have you improved?

[@shivaayshorts000]

​@@splashbruda8211have u been pro now, or still at learning phase?

[@gdplentie3]

​​@@i_am_dumb1070and how about you?

[@sivi1560]

Amazing video! Thanks, it really helped me as a total newbie to OOP.

[@syedusamamanzoor1838]

I'm a complete beginner to programming and this is so well explained that even a illiterate like me can understand.

[@jadamccoy8376]

Excellent explanation! Thank you!

[@kingshanaman]

Simple and straight to the point.

[@kairu9413]

I like how he use game examples to implement the 4 main principles of oop, it keeps me interested.

[@badhombre4942]

Abstraction means, focusing only on that which is relevant to your application, when modelling your objects/classes. For example, the attributes and behaviour you would assign to a Person object would be different for a banking.vs a fitness app.

[@bassome3000ify]

Oh mah gah it was so beautiful 🤤 Thx fcc 🥺

[@FlygarN338]

Best video ive seen in my life. Thanks for saving my future

[@Lembdadelta]

I thought I would be studying the whole weekend for that Java class in which I'm totally lost... but in 30min at 1.25 speed I've gotten further than in several hours of regular lecture. Thank you for your clear explanation.

[@KhangNguyen1]

Thank you for making this detailed video.

[@dorischoo]

This is a complex foundational subject that clearly explaining the principles of how it works. 😎 cool! Thanks

[@fredericktiku2585]

I love Your voice tone and method of teaching,thank you.

[@MjCNirdna]

My teacher took 2 months to explain all of this OOP main principles.

[@aammssaamm]

This guy does not understand them either. He gives a wrong example.

[@abhishekjoshi4091]

@@aammssaamm stop hating and point out what he taught wrong

[@aammssaamm]

@@abhishekjoshi4091 You may want to learn some good manners first.

[@Doschia]

@@aammssaamm So he has no mannes because he says "stop hating"? Interesting.

[@aammssaamm]

@@Doschia you may want to get the same.

[@ThatGuyAlon]

Thanks for this. I'm taking this class next semester. Wish me luck

[@williamwambua7710]

This the best intro everrrrr...thank you lemme sub

[@dimykogoya2561]

Thank you for explaining the concept!

[@cj7528]

Really clear explanation. Thankyou!

[@user-wc1sm8cj8s]

Great Video!!! Thanks for this tutorial!

[@zensic]

Thank you! Was a good refresher!

[@RugbugRedfern]

This is the most useful and informative programming video I've ever watched. Thank you so much!

[@saurabhsharma6929]

Thanks, great explanation.

[@zechariahhounwanou8462]

This was really helpful. It made me understand Encapsulation, Abstraction, Inheritance, and Polymorphism. worth my time

[@schmetterling4477]

Yes, but you still don't know how to use any of that to write better software. Maybe you think you do, but that only makes you more dangerous, not more professional.

[@craigsang4726]

Thank you so much for sharing 🙌bro

[@Ihbramm]

Good refreshment here! Thank you a lot!

[@wayneinteressierts9973]

Great explanation, thank you!

[@skn__07]

Even though I have learned these before, this one is a real gem.

[@freedatascientist2786]

Nice content ! Thanks for the inspiration

[@pawel040408]

Very good overview and intro to the subject.

[@Twysthor]

Thank you for this refresher! The line between Encapsulation and Abstraction tends to blur in my mind

[@AbhiKhatri]

Think of encapsulation as grouping together and abstraction as hiding the inner workings. That worked for me.

[@Twysthor]

@@AbhiKhatri short and sweet! Thanks

[@ToniLopezMM]

Thanks very much, extraordinary and very clear crash course

[@aymadummeech]

If I'd describe OOP, it would be convenient interaction/communication. Its like two people having a great conversation that would result in a mutual benefit

[@lepidoptera9337]

Yeah, that is not what is is, but keep smoking. ;-)

[@TonyTigerTonyTiger]

@@lepidoptera9337 Oh, so you just trolling all over the place in the comments to this video. What a sad, little person you are.

[@SweepAndZone]

Lmfaooo ​@@lepidoptera9337

[@liliaa1749]

This was a life save thank youuu!!

[@upgraduate]

The theoretical explanation was good to understand.

[@omnikam3045]

Keep making such informative course

[@radu9150]

Is there a continuation video after this one? Great explanation🎉

[@chandra.developer]

By far the best video on oops. Exactly what someone needs.

[@McFlashh]

Could be better if they implemented the examples in code.

[@hhbadarin]

The best of the best, Thank You!

[@Fire_Rice]

this is very helpful. thank you!

[@mohgawsih6958]

thank you . . . much needed material . . . trans-language concepts

[@mrboyban]

Nice, clear English content, many thanks.

[@rasu84]

Thanks. Very clear and concise.

[@johnsonsubedi1193]

Great Work to keep up self-learners. Thank you 🙇

[@aammssaamm]

Actually it has really bad issues self-learners cannot identify.

[@hexerei02021]

@@aammssaamm Could you share some of those issues pls ?

[@aammssaamm]

@@hexerei02021 Already.

[@andresfeslavazuluaga9611]

Thanks for explaining it!!!

[@bakhtiyor_sulaymonov]

Thank you. Very well explained

[@i_am_dumb1070]

It really helped me a lot to understand this OOP topic Thankyou very much fcc.

[@yashpathak9285]

That a semester course in 30 minutes. Thank you Freecodecamp!!!

[@Trupen]

Thank you

[@neviswarren]

Excellent thanks.

[@venkatasreeram]

Waiting for this course.....🔥

[@kvelez]

Great study.

[@harsha7010]

Thank you ☺️

[@josephinekwakye4495]

This is gold...Thank you

[@kuldeepgupta7607]

Great explaination!

[@samuelescobar6121]

i liked learning both the intro to programming and this intro to OOP, it was hard for me though :)

[@ashrafbeshtawi3556]

I am having a job interview after 15 min.. good short refresh.. wish me luck Update: I got the job ✌😃

[@anjanaouseph4605]

Hope it went fine!

[@ashrafbeshtawi3556]

@@anjanaouseph4605 it was great. I will get the final response in 1 week😃

[@anjanaouseph4605]

@@ashrafbeshtawi3556 All the best!

[@SahPhoenix]

Hope it went well!

[@bruhman4939]

Hope you got a good response!

[@jdabbasi990]

Simply Bravo

[@VideoBunt]

Cool explanation)) but what about aggregateon and composition?

[@thecaveofthedead]

Very useful. Criticism: sometimes you're referring to this object refers to this object and it became completely unclear in which direction interactions were happening.

[@nafisnawalnahiyan5032]

Thank you for helping me! Forever in debt!

[@aman-tl9gd]

*Was watching naruto then this video distracted me!*

[@narc7885]

U got ur priorities right!

[@arjunbabu03]

this is cap!

[@petarstoyanov9024]

Utterly excelent!

[@saidneder41]

Beautiful!!!

[@neviswarren]

Thanks!

[@yopanssudo]

That was great. Thanks.

[@adriansrfr]

The way I see it, Linux is written in C so it is procedural. The linux philosophy is everything is a text file. In contrast, OOP philosophy would be that everything is a spreadsheet.

[@gareginasatryan6761]

The kernel is organized in a OOP style though.

[@hasanrants]

great video! well explained.

[@megrief]

It was really clear explanation. Thanks for your work. It would be perfect to make sound also clear, but it's not so necessary ^_^