Optionals In Java - Simple Tutorial

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Full tutorial on Optionals in Java!
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Optionals were added in Java 8, but can be a confusing thing to learn. This tutorial will walk through all of the aspects of Optionals in Java detail, then walk through step by step when and how to use optionals in your own code!
If you're confused by Optionals in Java, either just what they are and why they exist in general, or how to code to use them 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.
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Опубликовано:

26 июн 2022

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Комментарии : 428

@stevenschelling8452 Год назад

This is the gold standard of coding tutorials, thanks for such well-structured info

@iamarnabpal Год назад

Seriously... Pure GOLD!

@YatiAcharya 10 месяцев назад

You know how I am certain this is the best Java channel? I have no interviews to crack, I have no exams to clear and I'm still here learning because it just is explained in such an interesting, problem-solution kinda way. Brilliant work, John!

@Amitjha406 6 месяцев назад

Agreed

@BryanChance 5 месяцев назад

Yes, I second that. This is the best Java channel. :)

@nikamz6077 Год назад

My coding exam is in just about a month - and I would like to thank you, John! You have helped me so much. If I pass, thats because of you. Love your channel! Greetings from germany. :)

@nikamz6077 Год назад

Update: I passed. 😍💪🏻

@celeryman1650 Год назад

Congrats!!

@CodingWithJohn Год назад

Great to hear! Congrats!

@user-nu6vz9pt8g 9 месяцев назад

@@nikamz6077 Congrats!

@ItIsJan 9 месяцев назад

@@nikamz6077gut gemacht!

@juanantoniosicardocontrera8390 3 месяца назад

It's very difficult to find such well explained, well paced and easy to understand coding tutorials on youtube, thanks and congrats for having such good content.

@adrianfiedler3520 Год назад

Always wondered what the true benefit of optionals vs null checks is. This really cleared things up for me!

@gulbalasalamov1367 Год назад

Love the cat example and box metaphor! :) 4:45

@LightningLion500 Год назад

I just started watching your channel and I love your calm and reassuring way of explaining complex coding aspects! It motivated me to work a little harder on my own projects, unlike the often condescending explainations of the teachers at my university. Thanks John!

@cloyyd2227 Год назад

i just started my internship for the summer and the code they have us working with has a ton of optionals, which was something i had never heard of. You’re videos are truly always a highlight to my day and explain it so neatly and concisely, not to mention the timing! please keep doing what you do

@MariaBose-ky9jf Год назад

I love your channel for the calm and precise manner you describe things with - and also the nerdy references ahah

@gerdsfargen6687 Год назад

So good..guys, just keep coming back to John's channel. He explains everything with the greatest of ease.

@RsZ789 Год назад

Great job, John. Can you please cover logging and best practices for it?

@chinmayrath8494 Год назад

please keep blessing us with such non trivial concepts. much love !!

@sg4644 8 месяцев назад

I've a exam on Java tomorrow and I've to say your videos on Java are probably the best on RU-vid. Will be binge watching the your entire Java playlist tonight.

@christianolsson8644 Год назад

What an excellent video! I have studied Java but not worked with it and now I try to polish my knowledge to get a job in Java. I want to thank you for your easy to understand and amazing videos that take up very important and interesting topics. You're an amazing teacher and you get excited to learn more to look at your videos :)

@midhunmadhu5305 Год назад

I don't usually comment on any youtube videos. But here John, You are doing an excellent job describing topics in a simpler manner. Thank You.

@rlasc84 Год назад

Nice solution for dealing with null exceptions. So much cleaner than use ifs to check the return value. Hopefully some day java implements de null safe operator like groovy or kotlin. Great video John!

@user-jz4iz2qh9u Год назад

Your channel is my go to for any Java related topic. Thank you! Could you please consider making some design patterns tutorials? 🙏🏻

@zaph8015 Год назад

Null safety is one of the reasons I fell in love with Kotlin. It's caught me out so many times and helped me to think about where NPEs might be found even when working in other languages.

@petarJK Год назад

Excellent video! Very well explained. It's one thing to know something, totally different thing to be able to explain it well. Thanks!

@mohammedalbj4268 10 месяцев назад

This is pure gold, thank you so much!

@MrLuMax5 Год назад

Have been waiting for this for a long time, thank you!

@dinaadel1672 Год назад

your videos are really useful and easy to understand.. and you are explaining lots of interview subjects.

@juvipana Год назад

This was awesome, you made me chuckle. Made it really easy to follow, thank you!

@miltonezeh5085 7 месяцев назад

You are the BEST on these streets.

@Fnaf-vh9cs Год назад

this is something new definitely, IL look tomorrow into video and check some exercises. thanks John

@rikkarth_ 11 месяцев назад

Thank you, this video has helped me immensely.

@viswanathsairam5956 Год назад

Optionals demystified with your video. Thanks a lot for this precise explanation

@j.franciscox3318 9 месяцев назад

Love that desk setup, could you do a video about your desk setup? And maybe other stuff as well, such as your favorite IDE, text editors etc.

@Anderzon1994 Год назад

Thanks for sharing your knowledge! I enjoy watching your tutorials!

@sanjayranga2683 Год назад

The best possible explanation of Optional . You ve earned a subs and keep up.

@user-te9hf7qs1y Год назад

Thank you for your excellent videos! Best explanation of these small java- things!

@ShermukhammadKarimov 5 дней назад

thanks for the clear explanation

@ramkumar_balu Год назад

Perfect and standard video about the Optional.

@Ke5gggggel Год назад

Love your videos! Always looking if you made a video on the java subject I am looking for first before I watch a video of somebody else. Do a Tutorial about Streams please!

@emilywilson7835 6 месяцев назад

This channel brings me so much joy, and taught me so much. Thanks!

@ahouzimohamed6387 Год назад

Hi John thank u for ur efforts , can u please do a tutoriel about the spring and spring boot it will be amazing by u

@Un_Fulano_ Год назад

It would have taken me hours to look for and understand this information by myself. Thanks John.

@isleschild 24 дня назад

thanks for the work, this was excellent.

@ReBufff Год назад

Didn't even know what optionals were until now. Thanks!

@gabrielfono844 11 месяцев назад

this is so amazing as backend engineer, I 100% agree thanks a lot

@magadiflo-dev Год назад

Excellent explanation, calmly, deliberately and well mastered the subject, thanks for sharing your knowledge, greetings from Peru 🇵🇪

@JoaoLima-pq1hm 8 месяцев назад

Precious content, thank you! Greetings from Brazil 😊

@chentang514 Год назад

Amazing tutorial. Very clear.

@TechOnScreen Год назад

you just compiled all the facts about optional, thanks. can you also make a video on streams and lambdas and collections using them together to build business grade logical error-proof solutions..

@xtay2287 Год назад

Didn't know about the map-method. Thanks :)

@liliabekuzinaensosense8987 Год назад

You are just AMAZING! Please never stop! 💫

@pranaylonkar19 Год назад

Awesome video...👍 Now this concept is crystal clear. Please upload videos on streams, functional interface, method reference, and default method. Thanks...

@Ramison273 Год назад

my god, you are the best. i am from brazil and i am learning a lot with you. i love java and i found your channel last month, i am watching all your videos, your english and your explanation is so easy to understand.. thank you 😁😁

@vamonosraza4361 Год назад

I am So grateful for your videos!

@LutfarRahmanMilu 10 месяцев назад

Absolutely brilliant teaching style.

@mohammadsadeghsheikhzahedi3682 9 месяцев назад

Great job 🙏

@gamingislove3030 Год назад

Best video i ever saw on Optional.🎉🎉

@BrunoAraujo14 2 месяца назад

Thanks for this class, Schrodinger! 4:35

@iot_enthusiast Год назад

Wondering if you are planning to create Spring Boot content anytime soon :) After watching several videos in your channel, I believe that with that highly intuitive style of explaining subtle as well as complex, hard to understand concepts, the new content will attract a lot of views. Happy to be a subscriber :)

@xmaxxxwellx Год назад

Hi John! It's fantastic) I'm really appreciate it. The video is great! Thanks a lot :)

@rezahajivand7498 9 месяцев назад

Hello mr jhon . Thanks for your teaching video 🎉🎉🎉

@boldschool6308 Год назад

I definitely learned something! Thanks

@ginasomara267 Год назад

Bro life saver. Your videos are amazing.

@yashaswipandey7923 Год назад

Thanks man, i needed that.

@asherkhan2656 10 месяцев назад

Great explanation John

@Softrough1989 Год назад

Very good explanation and I loved the cat and the box. Thanks

@SUMITYADAV-cy9hf 2 месяца назад

hey John !!! amazing work requesting you to create a spring framework course as well .

@gopalkannan4934 Год назад

I love your channel. Thank you so much

@mohamedlegtibi802 Год назад

Best teacher so far. Greetings from Morocco 🇲🇦

@azam11250 2 месяца назад

great explaination sir. really liked ur videos and learned a lot. Thanks sir

@eduardoprado8055 Год назад

Awesome explanation!

@shakilahmed4647 Год назад

Before this I used to think optional is a mysterious box in Java. Thanks for the video

@reynerb3918 2 месяца назад

Thank you for the video, this is great content...

@cosmoatlas2435 Год назад

wish I had you the sophomore year of college. Great work!

@jaylawlmc1915 Год назад

THANK YOU SO MUCH for actually explaining when are where optionals are actually useful as opposed to using a return annotated with "@Nullable". I am lucky to have understood this topic before watching your video, but before i got to that point i was *severely struggling* to get behind why i would use Optional instead of null in the first place. That is due to many tutorials on optionals just leaving things at "it's a container where a value may or may not be present" but not going as far as you did. I'm absolutely certain this video of yours will help tons of people!

@pauldhartley Год назад

I must confess to still being confused at the usefulness of optionals, though the video explains admirably some of the characteristics.

@jaylawlmc1915 Год назад

@@pauldhartley cleaner and more functional code. Try working with streams for example. You cannot unlock the full power of streams using null checks

@jaylawlmc1915 Год назад

@@pauldhartley I point out functionality because you cannot much with a null value, other than check it and pass it. Optionals on the other hand, are integrated into javas core functionality. You can do tons of things with them just with what java provides. That doesn't even take into account what you or others may code for it

@muhammedemad1155 Год назад

Great tutorial , thank you

@jagger6277 Год назад

THANK YOU!!!

@whitneybrown1715 Год назад

Awesome tutorial!

@timmelis4872 Год назад

Another very well explained video ...

@shepherdej1010 Год назад

Hey John, first off, fantastic Video and well explained. Second, would you be able to do a video on the Java Garbage Collector and ways to utilize it?

@ultimatehuzefa Год назад

Best Java Tutor!!

@arcane3327 Год назад

The explanation with your cat was really great. Thanks for the good tutorial!

@siegfriedkurz8753 Год назад

Impressively explained.

@saiprakash5501 Год назад

Hi John, Nice content!...Keep up the good work🤝

@RotatingBuffalo Год назад

This is an example of a monad, in case anyone here has heard of monads but doesn't know what they are useful for yet. They generally provide a "Wrapper type" that you can use to chain operations safely on, without having to do intermediate work between every function/method.

@d2k2 4 месяца назад

Thank you!

@nishiths9228 Год назад

I always check out your videos cause it’s very easy to understand even the difficult concepts because of easy to understand explanations. I would love to buy the keyboard that you are using , which one is that :) Thanks in advance .

@dsmohammadaslam9527 3 месяца назад

your are just extraordinary sir , thank you sir please make video on java date and time

@victor__425 Год назад

Awesome! The society demands explaining all java features basing on this cute cat

@tostanco1117 Год назад

I do recognize the way you speak so clearly.

@dhilip77 Год назад

Your explanation are really simple, when could I expect spring boot

@sebon11 Год назад

Great video as always

@alinesinclaire2854 11 месяцев назад

epic explanation with the cat in the box it was so funny!

@svalyavasvalyava9867 Год назад

thank you infinitely!!!

@VivekSharma-zb6no Год назад

Nice explanation 😊

@philbowden3894 Год назад

Once again....excellent video.

@aurojitbasak3249 Год назад

Great 👍👍👍 I was waiting for your video. Thanks. Love from India. ❤️❤️

@xugefu Год назад

Thanks!

@nate6199 Год назад

Would you be able to do a video on using serializable for persistent data?

@vijaydhanakodi5591 Год назад

you should really teach design patterns. one of the best tutor in the universe.

@ashadahmad651 Год назад

I loved your explanation John, the way you explained was amazing, soothing and very clear. Especially loved the part where you mentioned how exactly a Optional is intended to be used, amazing content. Any chance you make courses on Springboot, Microservices etc please do upload them if you do or provide us a link to the course. Thanks once again.