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.

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.

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

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

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!

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

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!

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!

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.

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

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!

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

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.

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.

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

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!

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

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!

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

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

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

The examples r super clear. Absolutely recommended to watch!

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

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.

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

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.

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

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

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.

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

please do a more advanced one! loved this

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 👍.

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

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

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

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

Simple and straight to the point.

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.

Excellent explanation! Thank you!

Oh mah gah it was so beautiful 🤤 Thx fcc 🥺

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

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

Thank you for making this detailed video.

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

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

Thank you for explaining the concept!

Really clear explanation. Thankyou!

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

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

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

Thank you! Was a good refresher!

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

Good refreshment here! Thank you a lot!

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.

Great Video!!! Thanks for this tutorial!

Thanks, great explanation.

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

The theoretical explanation was good to understand.

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

Nice content ! Thanks for the inspiration

Thank you so much for sharing 🙌bro

Very good overview and intro to the subject.

Great explanation, thank you!

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

Thanks very much, extraordinary and very clear crash course

Keep making such informative course

The best of the best, Thank You!

Thanks. Very clear and concise.

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

Nice, clear English content, many thanks.

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

This was a life save thank youuu!!

Thanks for explaining it!!!

this is very helpful. thank you!

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

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

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

Excellent thanks.

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.

Beautiful!!!

Thank you ☺️

Thank you. Very well explained

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

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

Thank you

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

Great explaination!

This is gold...Thank you

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.

That was great. Thanks.

Utterly excelent!

its a good video to get a picture on OOP.

Justo cuando lo necesitaba

Waiting for this course.....🔥

Cool explanation)) but what about aggregateon and composition?

Thank you for helping me! Forever in debt!

Thanks!

Keen information. 🙏

Great video I wish I watched this when I first started OO

Sir please make videos on computers and and its basics operation like conversion of binary and some basics like ram, ROM , etc things ,......please because of exam and because of the lockdown we are not able to attend the computer science lectures please make video sir...... Lots of love sir for helping in this lockdown.........