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.
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!
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.
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!")
@@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.
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.
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!
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.
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
A thing that I like to do is writing a glossary of the topic I'm studing. This is good because a lot of times you will not find a simple answer to your question. For instance, if you don't know what a language construct is and you search it on the internet, probably you'll find that a language construct is a syntactically allowable part of a program that may be formed from one or more lexical tokens in accordance with the rules of the programming language. If you don't know what sytax and lexical token mean, this definitino will not make any sence for you. Once you search what them mean and write them down on you glossary, you will undertand what a language construt means. And, overtime, it will easyer to learn technical vocabulary because all the words you learned and wrote down on you glossary will build up and you will start to undertand thing more easily and make progress on the realm you are learning. And everytime you forget the definitino of a word that you've already written down, you will just have to check it out on your glossary. Overtime their meaning will stick to your mind.
Thank you for sharing this video. I have watched multiple videos on this topic on TH-cam and yours is hands down the best I have seen. I just watched it the third time and and comfortable with all the concepts.
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.
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 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!
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 👍.
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.
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!
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.
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.
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.
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.
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.
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
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.
Nice tutorial, but you know what is missing? The code.. examples with code... I search for many oop tutorials about encapsulation, abstraction, inheritance and polymorphism and every tutorial doesn't show code. I don't know why but I not sure if I understand any concept until I have theory and code to make the logic in my brain.
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.
So, structs' can be understood as more advanced arrays, because all the struct did was create an association between a key/value _vs._ index/value. the object is so crazy useful because of its ability to organize related data in a readable way. "position": 15
Chess is great for OOP because it's a closed world. Unfortunately, most software is open-world, subject to having its universe, topology, and "platonic ideals" shifted and enhanced/expanded. OOP struggles in that scenario.
Allthough, OOP seems hard to understand, it saved my life as a programer. With classes, i can keep my code in good order, and access it, whenever i need to. I am currently using php, and javascript.
The static polymorphism wouldn't accept another .drive(int spd, int time) method because the types are structurally the same as the .drive(int spd, int dst) that already exists right?
OOP makes code unreadable. because we need to search parent code to understand the child. and we need to search grand parent code to understand the parent code and so on.
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.........
![[#2024MAMA] ROSÉ (로제), Bruno Mars - APT. | Mnet 241122 방송](http://i.ytimg.com/vi/dgGqD28J6aQ/mqdefault.jpg)
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.
Thank you ❤
Thank You : )
Ok, Good Summary of OOP. Very Good Notes.
Noted
brudda take this like
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.
Inside polymorphism: overriding and overloading, right
@@adipurnomo5683 yes
@Hector Fontanez I agree
Thankyou
Q
I've been working for 6 years in the market and I can say no one has explained so simply as you did. kudos
I wonder why you haven't learned OOP in the 6 years you been in the market...
@@vavr8231 Who said anything about learning? I was talking about the way he explained. There is a difference, isn't it?
@@ayazulhaq4727 absolutely
@@ayazulhaq4727 apparently he has issues with his reading skill.
@@kientran4818 hahahaha. savage reply...
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!
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.
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!")
is it important for data science or machine Learning?
Good thing I started with c++
@@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.
@@MarcusHCrawford I swear 🤣
It's my first time actually watching a half an hour tutorial from start to end without closing youtube. Thanks a lot!
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.
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!
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.
I'm a complete beginner to programming and this is so well explained that even a illiterate like me can understand.
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.
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
A thing that I like to do is writing a glossary of the topic I'm studing. This is good because a lot of times you will not find a simple answer to your question. For instance, if you don't know what a language construct is and you search it on the internet, probably you'll find that a language construct is a syntactically allowable part of a program that may be formed from one or more lexical tokens in accordance with the rules of the programming language. If you don't know what sytax and lexical token mean, this definitino will not make any sence for you. Once you search what them mean and write them down on you glossary, you will undertand what a language construt means. And, overtime, it will easyer to learn technical vocabulary because all the words you learned and wrote down on you glossary will build up and you will start to undertand thing more easily and make progress on the realm you are learning. And everytime you forget the definitino of a word that you've already written down, you will just have to check it out on your glossary. Overtime their meaning will stick to your mind.
Thank you for sharing this video. I have watched multiple videos on this topic on TH-cam and yours is hands down the best I have seen. I just watched it the third time and and comfortable with all the concepts.
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.
Yeah thts true
Wow. Thank you for speaking so calmly and clearly! Big plus.
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!
This is by far best explanation of OOP I have ever heard, Thanks :)
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!
I’m just starting to learn programming. This is very helpful and the best explanation I’ve seen for a newbie.
How's it going so far? I am starting myself, curious how much you advanced in a year.
@@splashbruda8211 what about you how much have you improved?
@@splashbruda8211have u been pro now, or still at learning phase?
@@i_am_dumb1070and how about you?
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!
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 👍.
Amazing descriptions of the 4 main principles of OOP. Thank you!
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.
I am having a job interview after 15 min.. good short refresh.. wish me luck
Update: I got the job ✌😃
Hope it went fine!
@@anjanaouseph4605 it was great. I will get the final response in 1 week😃
@@ashrafbeshtawi3556 All the best!
Hope it went well!
Hope you got a good response!
Very articulate, practical, clear, insightful video!
Thanks so much!
By far the best video on oops. Exactly what someone needs.
Could be better if they implemented the examples in code.
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!
Such a good video!!! Helped me understand concepts that I'd tried to fully understand before, but couldn't! Thanks!
I like how he use game examples to implement the 4 main principles of oop, it keeps me interested.
Simple and straight to the point.
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.
My teacher took 2 months to explain all of this OOP main principles.
This guy does not understand them either. He gives a wrong example.
@@aammssaamm stop hating and point out what he taught wrong
@@abhishekjoshi4091 You may want to learn some good manners first.
@@aammssaamm So he has no mannes because he says "stop hating"?
Interesting.
@@Doschia you may want to get the same.
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.
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.
gotta say this video was an eye-opening for me in terms of oop, thanks heaps
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.
This is an exceptionally clear explanation of OOP. Well done!
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.
The examples r super clear. Absolutely recommended to watch!
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
Yeah, that is not what is is, but keep smoking. ;-)
@@lepidoptera9337 Oh, so you just trolling all over the place in the comments to this video. What a sad, little person you are.
Lmfaooo @@lepidoptera9337
This was really helpful. It made me understand Encapsulation, Abstraction, Inheritance, and Polymorphism. worth my time
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.
Thank you for sharing your creative way of explaining what OOP is.
Awesome. helps me to become a better programmer
I swear to you in uni, i did not understand nothing about how some of this stuff maybe useful. Thanks for your vid.
please do a more advanced one! loved this
Nice tutorial, but you know what is missing? The code.. examples with code... I search for many oop tutorials about encapsulation, abstraction, inheritance and polymorphism and every tutorial doesn't show code. I don't know why but I not sure if I understand any concept until I have theory and code to make the logic in my brain.
Best video ive seen in my life. Thanks for saving my future
Even though I have learned these before, this one is a real gem.
Thank you so much for this course! It's so pleasing to listen to :)
I love Your voice tone and method of teaching,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.
The kernel is organized in a OOP style though.
This is a complex foundational subject that clearly explaining the principles of how it works. 😎 cool! Thanks
Thanks bro I have an important test in 2 weeks and it was important to cram this stuff fast
BYE I DONT UNDERSTAND THE CHESS EXAMPLE 😭
So, structs' can be understood as more advanced arrays, because all the struct did was create an association between a key/value _vs._ index/value.
the object is so crazy useful because of its ability to organize related data in a readable way. "position": 15
Thank you for this refresher! The line between Encapsulation and Abstraction tends to blur in my mind
Think of encapsulation as grouping together and abstraction as hiding the inner workings. That worked for me.
@@AbhiKhatri short and sweet! Thanks
@@AbhiKhatri thank youuu
Thanks for this. I'm taking this class next semester. Wish me luck
Love this guy's content and presentations. More please
His approach is incorrect.
@@aammssaamm who hurt you
@@mb98765 oh, are you a harassment victim looking for your brothers in misfortune?
@@aammssaamm then correct him or gtfo
@@psylocke1517 You may want to get some good manners if you expect other people to cooperate.
Amazing video! Thanks, it really helped me as a total newbie to OOP.
Thank you for the informative video. It is a nice summary kept in 30 minutes with meaningful examples.
What is there to dislike about this video? People cannot be happy with anything -_-. Nice video keep up the good work.
Can we please have a PDF of this for quick read at later point of time
*Was watching naruto then this video distracted me!*
U got ur priorities right!
this is cap!
It feel simple on the surface, wait until you try to use it, and you will find it is plagued with details, rules, surprises, and limitations.
I think that understanding Abstraction & Polymorpism is a very long shot for me. Hopefully I will understand these two guys.
How's it going on that front?
@@mateuszjokiel2813 I dropped it
@@tko9753 Lol, happens I guess
i liked learning both the intro to programming and this intro to OOP, it was hard for me though :)
Excellent thanks.
It really helped me a lot to understand this OOP topic Thankyou very much fcc.
Is there a continuation video after this one?
Great explanation🎉
please create one video explaining all 23 or 24 design patterns it is very important topic but isn't available on youtube
thank you . . . much needed material . . . trans-language concepts
Good refreshment here! Thank you a lot!
Can we get a similar video on Functional Programming too?
No
Chess is great for OOP because it's a closed world. Unfortunately, most software is open-world, subject to having its universe, topology, and "platonic ideals" shifted and enhanced/expanded. OOP struggles in that scenario.
This is the most useful and informative programming video I've ever watched. Thank you so much!
The theoretical explanation was good to understand.
Thanks very much, extraordinary and very clear crash course
That a semester course in 30 minutes. Thank you Freecodecamp!!!
Good veido, Steve Jobs Kid. It is well done. They don't call you Jobs in vain! How can someone fire up such a productive person like you?!
Excellent explanation! Thank you!
This is great content! Clear and great density. Thank you!
it says you cannot create functions in struct, wrong. You can create functions inside structs in many languages
When I heard this i was wondering myself
Honest to god i can't believe this information is free wow 🤯
Great Work to keep up self-learners.
Thank you 🙇
Actually it has really bad issues self-learners cannot identify.
@@aammssaamm Could you share some of those issues pls ?
@@hexerei02021 Already.
Waiting for this course.....🔥
Allthough, OOP seems hard to understand, it saved my life as a programer.
With classes, i can keep my code in good order, and access it, whenever i need to.
I am currently using php, and javascript.
Very good overview and intro to the subject.
Thank you for making this detailed video.
Thank you! Was a good refresher!
This was a life save thank youuu!!
Thank you. Very well explained
Nice, clear English content, many thanks.
What a great video, thank you so much.
The static polymorphism wouldn't accept another .drive(int spd, int time) method because the types are structurally the same as the .drive(int spd, int dst) that already exists right?
yes
OOP makes code unreadable.
because we need to search parent code to understand the child. and we need to search grand parent code to understand the parent code and so on.
Thank you
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.........
Thank you for helping me! Forever in debt!
it would be better if these are explained with simple code implementations.
Loved the content. Subscribed. Hope the channel grows fast.
The best of the best, Thank You!
This course is amazing, but why would a sports car consume less than a normal car?