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!
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. :)
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
Dude, I can say for sure that your way of explaining is the best I've seen on TH-cam ever. That's considering that I'm not a native speaker. Thank you a lot.
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!
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.
love all of your content , it is clear precise and easy to consume i was thinking that it was really really tough but now i am very much comfortable with optionals
I've a exam on Java tomorrow and I've to say your videos on Java are probably the best on TH-cam. Will be binge watching the your entire Java playlist tonight.
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 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
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.
Can't resist writing a review, I am preparing for a job as a developer and chose Java as my technology, I have been learning since 4 months now, I was completely devastated and lost few days back as I am not getting any calls for the interviews, luckily discovered your channel and since then I have been going through all the concepts again from your videos, it's just making me so much more confident and stronger, your energy is just pure GOLD! All the topics have been explained crisply. Hope I'll soon land a good offer! Lots of love from India! ❤❤❤❤
Late Update: I am thrilled to announce that one month ago, I joined as a Java Developer in one of the best companies out there. Everything is perfect; my new job fulfills everything I have been looking for, and it feels like a dream 😍. Many thanks to John for his positive energy, knowledge, down-to-earth attitude, and all the help during my journey. I owe this to you John. Thanks to God and everyone for believing in me.
Hi John, I had an interview for SDE 3 at Walmart today, and I literally was able to answer everything along with proper Implementation, knocked it out of the park! Your tutorials are very brain-friendly, which is rarity nowadays :)
At 10:50 instead of demonstrating orElse with an "unknown cat" I would have used something like _string catDisplayValue = optionalCat.orElse("");_ because the whole point is to skip the "fake cat" (whether null, empty or unknown) and use directly the fallback value that needs to be used in the println when there's no cat! Please note that I suggested *pseudo code* -- my suggestion is not entirely syntactically correct (I come from c# and I don't know the Java equivalent to C#'s question mark yet)
"As a side note, if you know for sure, that the thing that you want to put into this optional is not NULL, then you can instead just use optional dot of" 6:06 Well, it sounds useless in this case, since the reason we used it was because of null case, right?
Hi John !! Your Java tutorials are compendious , please post videos specific to java development like building REST API , Spring Data JPA , Hibernate , Spring MVC etc.. That would be of a great help. Thank You !!
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 :)
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 😁😁
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!
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.
why not just have findCatByName return the "default" cat. and maybe have the Default cat a singleton since theere is exactly one. or do you do this in the clip after 11:09 ?
thanks for the video. I liked the cat object being used since cats like boxes. to me, it sounds like optionals are used as a communiation device to say something may or may not be there. really drive home the idea that it might be null. if I could, I think I would rename the class to Maybe: Maybe maybeCatExists = findCatByName("Fred"); the next question that I want to ask is "What are actual use cases of this?" You have me thinking. Checking the database for a record is a great example. I am thinking about using a jdbc bridge connecting java to sql. Thinking of right/left join on two or more tables where there won't be an exact match one very row. Maybe maybeRecordExists = findRecordByName
We probably get a second optional class in some future release of java. Since there are some huge performance improvements planned for the near future especially effecting optional. And then to keep compatibility they might add a similar type with better performance. Like they did with Vector and ArrayList.
I need cast null to Optional, cast Optional to throw or default value not enough. Like findCatByName(); or findCatByName(null); or findCatByName("name"); in method findCatByName(Optional optionalName). I hope in the future we will be use something like default value. Thanks for the video.
This is the gold standard of coding tutorials, thanks for such well-structured info
Seriously... Pure GOLD!
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!
Agreed
Yes, I second that. This is the best Java channel. :)
Love the cat example and box metaphor! :) 4:45
Reality: Optional is just workaround of a big and unsolved problem in Java language.
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. :)
Update: I passed. 😍💪🏻
Congrats!!
Great to hear! Congrats!
@@nikamz6077 Congrats!
@@nikamz6077gut gemacht!
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
Dude, I can say for sure that your way of explaining is the best I've seen on TH-cam ever. That's considering that I'm not a native speaker. Thank you a lot.
Thanks!
The best explanation of Optional in Java that I have ever seen. Thank you very much
after some years i still get myself drinking coffee and watching your videos, awesome content
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!
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.
Thanks for this class, Schrodinger!
4:35
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.
epic explanation with the cat in the box it was so funny!
Great job, John. Can you please cover logging and best practices for it?
love all of your content , it is clear precise and easy to consume i was thinking that it was really really tough but now i am very much comfortable with optionals
I've a exam on Java tomorrow and I've to say your videos on Java are probably the best on TH-cam. Will be binge watching the your entire Java playlist tonight.
Best video i ever saw on Optional.🎉🎉
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!
I must confess to still being confused at the usefulness of optionals, though the video explains admirably some of the characteristics.
@@pauldhartley cleaner and more functional code. Try working with streams for example. You cannot unlock the full power of streams using null checks
@@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
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.
Best teacher so far. Greetings from Morocco 🇲🇦
Can't resist writing a review, I am preparing for a job as a developer and chose Java as my technology, I have been learning since 4 months now, I was completely devastated and lost few days back as I am not getting any calls for the interviews, luckily discovered your channel and since then I have been going through all the concepts again from your videos, it's just making me so much more confident and stronger, your energy is just pure GOLD!
All the topics have been explained crisply.
Hope I'll soon land a good offer!
Lots of love from India!
❤❤❤❤
Late Update: I am thrilled to announce that one month ago, I joined as a Java Developer in one of the best companies out there. Everything is perfect; my new job fulfills everything I have been looking for, and it feels like a dream 😍. Many thanks to John for his positive energy, knowledge, down-to-earth attitude, and all the help during my journey. I owe this to you John.
Thanks to God and everyone for believing in me.
A 6'5'' John saying "OR ELSE" to the face is quite a threat 😀 Wonderful and interesting tutorial as always. You're the best John!
Hi John, I had an interview for SDE 3 at Walmart today, and I literally was able to answer everything along with proper Implementation, knocked it out of the park! Your tutorials are very brain-friendly, which is rarity nowadays :)
Awesome, thanks for sharing! Hope you get a great offer!
did you get the offer bro?
rip @pastasempa
@@CodingWithJohnl got an amazing offer and bought a nice cruiser motorcycle with that paycheck!!
Hey that's amazing, congratulations!!
Awesome! The society demands explaining all java features basing on this cute cat
Optionals demystified with your video. Thanks a lot for this precise explanation
As a kinesthetic learner I would like to thank you for bringing the actual cat for this videos which was Optional
I love your channel for the calm and precise manner you describe things with - and also the nerdy references ahah
Perfect and standard video about the Optional.
this is so amazing
as backend engineer, I 100% agree
thanks a lot
Thank you for explaining the concept
The best possible explanation of Optional . You ve earned a subs and keep up.
The explanation with your cat was really great. Thanks for the good tutorial!
Very good explanation and I loved the cat and the box. Thanks
It would have taken me hours to look for and understand this information by myself. Thanks John.
Didn't even know what optionals were until now. Thanks!
You are the BEST on these streets.
At 10:50 instead of demonstrating orElse with an "unknown cat" I would have used something like _string catDisplayValue = optionalCat.orElse("");_ because the whole point is to skip the "fake cat" (whether null, empty or unknown) and use directly the fallback value that needs to be used in the println when there's no cat! Please note that I suggested *pseudo code* -- my suggestion is not entirely syntactically correct (I come from c# and I don't know the Java equivalent to C#'s question mark yet)
Bro life saver. Your videos are amazing.
great explaination sir. really liked ur videos and learned a lot. Thanks sir
Absolutely brilliant teaching style.
You are just AMAZING! Please never stop! 💫
So good..guys, just keep coming back to John's channel. He explains everything with the greatest of ease.
"As a side note, if you know for sure, that the thing that you want to put into this optional is not NULL, then you can instead just use optional dot of"
6:06
Well, it sounds useless in this case, since the reason we used it was because of null case, right?
wish I had you the sophomore year of college. Great work!
Hello mr jhon .
Thanks for your teaching video 🎉🎉🎉
Best Java Tutor!!
Optionals are extremely useful and explicitly and semantically tell the caller to deal with nulls 😊
This is pure gold, thank you so much!
This was awesome, you made me chuckle. Made it really easy to follow, thank you!
This channel brings me so much joy, and taught me so much. Thanks!
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.
Hi John !! Your Java tutorials are compendious , please post videos specific to java development like building REST API , Spring Data JPA , Hibernate , Spring MVC etc.. That would be of a great help. Thank You !!
thanks for the clear explanation
Great explanation John
Thank you, this video has helped me immensely.
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 :)
your are just extraordinary sir , thank you sir please make video on java date and time
A cat in a box. It’s the perfect combo👌 Thank you for this great tutorial!
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 😁😁
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
Always wondered what the true benefit of optionals vs null checks is. This really cleared things up for me!
Didn't know about the map-method. Thanks :)
Precious content, thank you! Greetings from Brazil 😊
this is something new definitely, IL look tomorrow into video and check some exercises. thanks John
Thanks! Direct to the point, it worth all 16 minutes. If I could give 100 likes I will ask why I can't give 1,000
Excellent explanation, calmly, deliberately and well mastered the subject, thanks for sharing your knowledge, greetings from Peru 🇵🇪
Awesome explanation!
Once again....excellent video.
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!
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.
I love your channel. Thank you so much
thanks for the work, this was excellent.
No cats were harmed during making of this tutorial :D You forgot to add that! Good tutorial loved it :)
Yeah, Fred is a trooper
Have been waiting for this for a long time, thank you!
why not just have findCatByName return the "default" cat. and maybe have the Default cat a singleton since theere is exactly one. or do you do this in the clip after 11:09 ?
I do recognize the way you speak so clearly.
Cats definitely love playing with/in Optionals
Amazing tutorial. Very clear.
Awesome tutorial!
Coding with John deserves more attention.
Feel free to share! And thanks for watching!
Impressively explained.
thanks for the video. I liked the cat object being used since cats like boxes. to me, it sounds like optionals are used as a communiation device to say something may or may not be there. really drive home the idea that it might be null. if I could, I think I would rename the class to Maybe:
Maybe maybeCatExists = findCatByName("Fred");
the next question that I want to ask is "What are actual use cases of this?" You have me thinking. Checking the database for a record is a great example.
I am thinking about using a jdbc bridge connecting java to sql. Thinking of right/left join on two or more tables where there won't be an exact match one very row. Maybe maybeRecordExists = findRecordByName
We probably get a second optional class in some future release of java. Since there are some huge performance improvements planned for the near future especially effecting optional. And then to keep compatibility they might add a similar type with better performance. Like they did with Vector and ArrayList.
Nice explanation 😊
The map 😲, thanks for the video
Before this I used to think optional is a mysterious box in Java. Thanks for the video
please keep blessing us with such non trivial concepts. much love !!
I definitely learned something! Thanks
Great video as always
I m surprised there is no comment on the cat and the box ? that was the best part
Very nice explain bro.....
Thank you for the video, this is great content...
I need cast null to Optional, cast Optional to throw or default value not enough.
Like findCatByName(); or findCatByName(null); or findCatByName("name"); in method findCatByName(Optional optionalName).
I hope in the future we will be use something like default value.
Thanks for the video.
Great job 🙏
I am So grateful for your videos!
You remind me of those super cool, good and cute uni teachers everybody loves. Your videos are so fresh and spot on. I really like them, so thanks!!!!
your videos are really useful and easy to understand.. and you are explaining lots of interview subjects.
Great 👍👍👍
I was waiting for your video.
Thanks.
Love from India. ❤️❤️
Great tutorial , thank you
Thanks man, i needed that.