Records In Java - Full Tutorial - The Best New Java Feature You're Not Using

Рет қаралды 246,678

2 жыл бұрын

How to use Records in Java!
Complete Java course: codingwithjohn.thinkific.com/...
Records are a new concept added to the Java language as a preview feature in Java 14, and in a full release in Java 16. In this intermediate Java programming tutorial, we will talk all about when you would want to use Java records, and exactly how to do it.
If you're confused by records in Java, you're in the right place!
Learn or improve your Java by watching it being coded live!
Hi, I'm John! I'm a Lead Java Software Engineer and I've been in the programming industry for more than a decade. I love sharing what I've learned over the years in a way that's understandable for all levels of Java learners.
Let me know what else you'd like to see!
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Пікірлер: 540

@keionvergara7608 2 жыл бұрын

you were the reason i got a 5 on my ap comp sci A exam!! you truly have impacted my education and taught me more than my highschool teacher did in 5 months !

@CodingWithJohn 2 жыл бұрын

Awesome, and congrats!

@Reichstaubenminister Жыл бұрын

Funny, 5 would be an E in Germany. Had to think about that for a second.

@justinliu7788 Жыл бұрын

It’s 5/5

@ItIsJan 11 ай бұрын

@@Reichstaubenministersprach der reichstaubenminister

@Mahmoudalkasem1997 2 жыл бұрын

The best person on KZfaq that explains java in such a great way

@pavelsakun2308 2 жыл бұрын

If you didn't see anyone better doesn't mean he is the best ;-) He is good anyway.

@Mahmoudalkasem1997 2 жыл бұрын

@@pavelsakun2308 this is my opinion and l am free to think whatever I want right ;)

@libertymedicalcommunicatio4908 2 жыл бұрын

Congrats on almost reaching 100K. This one should put you over the top.

@fisch37 2 жыл бұрын

You are correct!

@sukusukumar2413 2 жыл бұрын

Please take one class about scanner class..

@HasNoName69 Жыл бұрын

Thanks

@Nanagos 2 жыл бұрын

I recently found out about Records but there are just no good tutorials about it. I'm glad you made one now.

@CodingWithJohn 2 жыл бұрын

Thanks! Yeah there's surprisingly little out there so far. Probably just because it's pretty new.

@arnddeshives147 2 жыл бұрын

There is a lot of content like this out there, but you are so much better than the rest in terms of tempo, order, quality and presentation, thank you so much! I started studying CS half a year ago and your videos are 5x quicker at explaining the same thing than my prof. Although sometimes there is some depth missing, but it's good that your videos don't get lost in that, that's what makes it so good. Maybe it would be great if there was a playlist for in depth knowledge as well though.

@iCybqr 2 жыл бұрын

Could you do a video on Consumer, Predicate, and Supplier? I mostly understand what they do, but not when to use them.

@YtubeUserr 7 ай бұрын

if you are reading this John, please make this video happen! Thanks!

@huskydreaming 2 жыл бұрын

I am advanced in java but it is great to see someone explain it so concise. Amazing explanation on these types of videos. Keep it up!

@GreatProgrammerHsin 2 жыл бұрын

please never stop making videos, these are so helpful!

@leeamraa 2 жыл бұрын

Quality, effective, efficient and much appreciated content.

@pradiptaspointofview1475 2 жыл бұрын

Explained quite clearly with detailed examples. Excellent tutorial! This is what I needed to start working with Records in Java.

@Markki28 2 жыл бұрын

awesome as always, thank you for sharing man, I am familiar with records but I'm not aware that I can do specific field validations directly into it, that's very useful thanks man

@sijanbhandari7569 2 жыл бұрын

Thanks for teaching me more about records, I was always teaching my fellow programmers about this in my workplace.

@randomuserrandom8613 2 жыл бұрын

Thank you so much. This was very helpful and the way you explain things makes it so easy to understand them. Keep up the good work, John!

@simonrozendal7542 2 жыл бұрын

Hi John. Even when i write Java programs quite a while, i still learn new thing from you. Thank you, you are presenting good Java content. Kind regards, Simon Rozendal.

@pclclau 2 жыл бұрын

At 5:00 you mention that Java generates a default, no-arg constructor *even if* you don't create other constructors. That isn't quite true, Java creates a no-arg constructor *only if* you don't create other constructors. This is why your fields get red underlines as soon as you manually create the no-arg constructor, because there would be a way to have final fields that aren't initialized as soon as the object is created. Before you manually created the no-arg constructor this wasn't a problem, because Java wouldn't generate one since you already had the previous one created.

@eufraniodiogo50 2 жыл бұрын

That's absolutely true, maybe it was just a runtime exception(subclass of Exception) at his speech. lol

@KaraSuraDraw1 2 жыл бұрын

I don’t get what you mean. I feel like your comment just justified what he said. Or do you think he meant even if you have other constructors Java always generates a default no-arg constructor? I think he just put it there for visuals of a no-arg constructor. Because i got that what you said from the video.

@pclclau 2 жыл бұрын

@@KaraSuraDraw1 He said that Java provides a no-arg constructor no matter what constructor you already have definded. That's not true.

@alfasolarenergy 2 жыл бұрын

When you create an object of the Class two things happes: 1. MEMORY IS ALLOCATED, 2. THE CONSTRUCOR IS CALLED. By default Java offers a 0 argument construcotrs which are 0 for numeric types, and false for boolean and null. The moment we create our impemtation of constructor ( a constructor which initialize fields) the 0 arg one is no longer called.

@TechiiEngineer 2 жыл бұрын

True , if you have created just an args-constructor ; You cant created object as : new Employee(); That means Employee class doesn’t have no arg constructor ; You have to create one.

@user-pn4iz7ns1v 17 күн бұрын

Thank you John! You structure your videos exceptionally well and have a very clear explanation style

@MrLuMax5 2 жыл бұрын

Great video. Especially for those who know the basics and are interested in new Java Features after J11. Keep these up!

@sameersafi6128 2 жыл бұрын

The way of teaching is totally different.. thank you so much for the deep knowledge that you are sharing... kindly make tutorial on stream api in future

@katisbetter2952 2 жыл бұрын

Keep up with the good work, you’re helping a lot of people 🙏🏻

@antonkimberg8914 2 жыл бұрын

Hi John, Thank you for your superb content. Me and other group of people from Estonia are learning Java and your channel helps us to understand hard material in a simple way. Could you please make a video tutorial about streams in future? Thank you in advance, Tony

@eperrone 2 жыл бұрын

Not a Java developer but I have to read Java and Groovy all the time. Your videos are great background to help me understand what I’m looking at. Great stuff.

@bischoffdev 2 жыл бұрын

I thought I knew all about records (and I am using those extensively) but this is the first time I heard about the compact constructor! Thanks a lot!

@emilmathew2257 2 ай бұрын

Have been following your videos for a while now. Thank you for the awesome content 😊

@mastershonobi110 2 жыл бұрын

Thanks John!!! Always looking for ways to improve and writing clearer/better code.

@mastershonobi110 2 жыл бұрын

Side Note…are you using Java 17 or 16? B/c “records” is not supported in Java 11.

@DMoots 19 күн бұрын

Thanks John, this video really set the Record straight for me!

@jimjimjimjimjim6572 2 жыл бұрын

Nice pace, and super clear, cheers my man

@nischalofchrist 2 жыл бұрын

Thank you, I've always wanted to learn about Records.

@ArjunKumar-zu2kl 6 күн бұрын

Just wow John, you are awesome. Clear voice. Thank you so much...

@haidaraibrahim9195 2 жыл бұрын

I've watched all of your videos and they r really really helpful and easy to understand, seriously.. u're an amazing teacher and I wish all success for u and ur channel. Small demand: I'd like to learn about Streams in ur way the next tutorial, if that's fine, however, any tutorial u make wod be awesome. Thx man, you're LaJend (J refers to "Java legend"🙂)

@olivierbegassat851 9 ай бұрын

Your exposition is always so direct and simple. I love it 🙂

@BkSMedia Жыл бұрын

I've been learning Java in my CS degree for the last three years, I had no idea records were a thing!!! So cool!

@CodingWithJohn Жыл бұрын

Yep! They're a relatively recent addition.

@ayberkctis 2 жыл бұрын

Hey John! If i knew Records before, i would use them in my previous task in my company because they fitted my task perfectly! Thank you for your effort :)

@mustapharaimilawal8053 3 ай бұрын

Thanks a lot for doing this tutorial. Clear, easy to follow explanation as always.

@ccmawil20 2 жыл бұрын

Explanation is clean and clear. please publish more videos like this. Thanks

@chenchi6623 8 ай бұрын

I like the style of teaching, very clear examples and no bs, earned a sub...

@shankar7435 Жыл бұрын

Never thought learning Java would be such a pleasure. A decade ago, I was frustrated with the Java Reference book and left learning java and continued with my day job in DB language. Now, I am learning java without any issues with the help of youtube. Thanks to the youtube community.

@Jody-nf2bz Жыл бұрын

Very well explained, readable size text, excellent class! Thank you!

@longtran12345678 2 жыл бұрын

your videos really help me to focus on Java again :)

@mohamedsaleh5970 2 жыл бұрын

You helped me understand concepts that was difficult to understand on my own.

@RamGorre 2 жыл бұрын

That's an awesome no BS explanation. Too good.

@hunelysium Жыл бұрын

Hello John, it's always great to listen to your explanations on Java! Thank you for your valuable wisdom!! On a side note, noticed your voice and the way you talk has changed since you become a father :) Hope you and your family well during this different times! Keep making thus great videos, always love watching them!

@AbdelhameedGamal-ki7th 6 ай бұрын

So simple and clear explanation. I really appreciate your help.

@lucashenrique6076 2 жыл бұрын

Thanks for the Video John! Greetings from Brazil 😉

@PratikKumar42 2 жыл бұрын

Great video, these really helps alot.

@maneshipocrates2264 2 жыл бұрын

Thanks alot John. This talk should be included in the official doc.

@budiardjo6610 5 ай бұрын

after i am learning about memory management, stack and heap and jvm internals i could really understanding this properly what a powerfull feature

@tuna5395 Жыл бұрын

Thanks bro you helped with my project !

@jaimesastre6393 2 жыл бұрын

really cool!!! Spring had some simplification, but here it's much better and has also interesting options! Thanks 👍👍

@Giorgi.Japiashvili Жыл бұрын

What do you mean by the Spring simplication?

@JorgetePanete 2 жыл бұрын

Perfect tutorial, much appreciated!

@andres98 2 жыл бұрын

I was waiting for this video so badly :))

@chacha-bm4jc 2 жыл бұрын

Thanks a lot John! Would be there any video about sealed classes? It is also quite cool feature

@bacon37460 2 жыл бұрын

Nice feature, thanks John for sharing it with us.

@raz0229 2 жыл бұрын

You are so underrated! Hope you reach 1 mil subs soon

@WisomofHal 2 жыл бұрын

Wow, awesome video! There are many ways I can think of to use Records.

@TakeshySun 2 жыл бұрын

@ Coding with John , Hi, could you please record a video about Java 8 features like Optional and Streams. It will be so wonderfully. And big thank you for short and really useful videos!

@sandunicula6185 2 жыл бұрын

Great presentation! Thanks!

@cverde1234 2 жыл бұрын

This is really similar to records in C#. We don't have compact constructors though. I think compact constructors are really neat.

@argonwheatbelly637 Жыл бұрын

Guitars 🎸, drums 🥁, and programming. 💻 Yep! You're definitely part of my tribe. Excellent video! Keep it up.

@Naimadmdp Жыл бұрын

Nice content mate, thanks for share!!!

@ChristienChapman 2 жыл бұрын

Good tutorial. I will use this from now on, much more simple way to do the same thing. God bless you.

@fazithfouseen1548 2 жыл бұрын

Hi John, Please upload Microservices and spring boot tutorials as well

@jaspreet821 9 ай бұрын

Great episode my man!! 😮😮

@AHMED-ry2gy 2 жыл бұрын

Hey John, Congrats on reaching 110K, please do videos on java streams, java sockets, Mockito and MVC in the future, thank you

@bouaddiismail 2 жыл бұрын

great lesson as always , grettings from Morocco

@RahulSingh-qe4sw Жыл бұрын

Thank you so much , explaination was very nice.

@yansoe2191 Жыл бұрын

Hay John, Thank you for the great content. You really simplify this. Do you mind covering Executor Service (Multithreading)

@BillyCha00 2 жыл бұрын

Hi John, you are the best!! please upload Microservices and spring boot tutorials :)

@johnkeck 2 жыл бұрын

This is great! I learned a lot from this video. But it left me wondering which versions of Java have records. Also, what about records that have many fields? Are records compatible with the builder pattern recommended for constructors with more than four or so parameters? Keep up the good work, John!

@vijaykumarreddyt3287 Жыл бұрын

First question, answer is java 16

@Atom-Mercury 11 ай бұрын

Very well explained. Thank you kindly.

@davidfernandotorres3484 2 жыл бұрын

Amazing bro! Thanks for the info

@darkworld8544 2 жыл бұрын

Hi John thank Q for ur valuable information sharing love from India 🇮🇳

@RicardoSilvaTripcall 2 жыл бұрын

Great explanation !!! Congrats ....

@Speiger 2 жыл бұрын

Looks like Records are like Lombock. I assume they have the same pitfalls you can run into if you are not careful. But this tutorial was really nice, I haven't touched these yet, but i see for myself already tons of usecases for this. Especially for like singleton function classes, where you have your builder and then the object that executes said code. Keep up the work!

@hellowill 2 жыл бұрын

It's not as powerful as Lombok unfortunately

@Speiger 2 жыл бұрын

@@hellowill But it does not have the same critical performance pitfalls like Lombok has. And to give context. In a performance sensitive context lombok has the ability to destroy your performance just based on how the variables are compared in a hashcode/equals function where the order can be important.

@hellowill 2 жыл бұрын

@@Speiger Ah right. I guess I dont focus too much on performance critical workloads. I do wish records had better support for builders or so called 'withers'.

@Speiger 2 жыл бұрын

@@hellowill Lets put it that way. For people who use lombok its not a great option. For everyone else it is a good way to reduce code and it does reduce the Licensing hell.

@emanueltrandafir8756 2 жыл бұрын

@Speiger, @Will - I personally believe java records and lombok are different features that can be used for different things. Records are similar to Lombok's @Value classess, indeed - but Lombok has a lot of other features to offer and it allows much more flexibility.

@B-Billy Жыл бұрын

That's a really good teaching... Thanks 🎉

@MortenSlottHansen Жыл бұрын

Nice and precise explanation without any fuzz 🎉

@ting-yuhsu4229 2 жыл бұрын

This is amazing! Thank you :D

@anantharamu80 2 жыл бұрын

Love this. Very informative.

@luisciprian412 2 жыл бұрын

Hey John! Great video as always. I have a questions, the code course that you offer, does it also bring exercises for the user to solve? So like, you give a lesson and then there are some exercises for us to solve? Or you purely teaching? I will really like to know

@KarolKasperek Жыл бұрын

u have the best java keyword's tutorials, ty

@alexornwara3182 2 жыл бұрын

I cannot believe I completed many courses and projects in Java without using this 😔🤯 My goodness, think of the time I could've saved! Thank you for making this video. It's so engaging, informative, and very easy to understand.

@yaroslavpanych2067 2 ай бұрын

That means, that this stuff is not really important. It is not a unique cure to any problem you had.

@FLStudioTutorialz 2 жыл бұрын

Awesome. Thanks.

@frankjuuh 2 жыл бұрын

Love you, John. Best teacher.

@AbdelkebirMalek 2 жыл бұрын

I love your videos you're a Hero! Please, visitor pattern implementation 🙏

@kirankumarsukumar 2 жыл бұрын

Omg. You are so amazing at teaching. Thanks Master Yoda

@jamfamily4287 Жыл бұрын

This is an extremely useful and time saving feature!

@tanacing347 Ай бұрын

Gracias John!!!

@ayed-al-nator Жыл бұрын

Beautiful video 💚 thank you 😊

@DevPieter 2 жыл бұрын

This is sick! I wanted to find this sooner 😥

@KoryGraphic 2 жыл бұрын

Thanks for this John, the clearest tutorial on the topic as always. I assume these aren't good as DAOs as they're immutable?

@ssssssy1327 2 жыл бұрын

I think it may be useful for replace DTO (even with Lombok).

@hakkcancakmak6275 2 жыл бұрын

Thanks for this video

@javalady Ай бұрын

Wow that was cool, thank you 😍

@evagor730 Жыл бұрын

Wonderful explanation! Thank you! Shorty and clear)

@vladimirspasov5591 2 жыл бұрын

Great explanation

@MrFluteboy1980 11 ай бұрын

This video reminds me so much of the mCoding video on python Data classes!

@nokiababai2407 Жыл бұрын

Hi dude, please do a series on java streams. This records are very crystal clear thanks

@raoufbenabdelwahed6362 Жыл бұрын

well explained as usual !

@givemepepsipls536 2 жыл бұрын

he best person on KZfaq that explains java in such a great way

@MrBrackets Жыл бұрын

great video, thank you!

@sanuretaroro3281 2 жыл бұрын

Your explanation is beautiful

@salimnegan7289 2 жыл бұрын

Hi i am a french student , we started the poo this week , i think this vidéo gonna help me 😄