Map and HashMap in Java - Full Tutorial

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Maps and HashMaps in Java can be so confusing when you're first starting out your Java career.
But Maps and HashMaps don't have to be confusing at all! A Map is a simple, powerful tool to have in your programming arsenal, and this video will give you everything you need to know to use Map and HashMap confidently in Java, even if you're a Java beginner.
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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Опубликовано:

13 июн 2021

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Комментарии : 440

@gur151 2 года назад

Super underrated channel. With how little views your videos currently get, I'm surprised RU-vid even recommended them to me! You deserve a lot more viewers for how well you explain things, and I hope your channel gets the recognition it deserves soon enough

@CodingWithJohn 2 года назад

Thanks! As you for sure already know, liking/subscribing/sharing/commenting all really help, so I really do appreciate it!

@thunderstruck2727 2 года назад

At this rate his channel won’t be small for long.

@davidteklea1032 Год назад

I feel the same way as you Gur.

@iskandar-9726 Год назад

@@davidteklea1032 +1

@blazing_yt2342 Год назад

Amazing explanation man, you actually made mapping easier.

@millenialmusings8451 2 года назад

the one thing i like about this channel is he doesn't waste any time. you can see he edits out speech pauses and filler words. very concise and engaging.

@SpideCooper 2 года назад

yeah it didn't even feel like ten minutes just found this page and its already awesome

@yuto5636 2 года назад

I am a first year software development student and there are a bunch of stuff they didn't teach us. This video is quite useful! Thanks!

@CarlosCed 10 месяцев назад

Sir, I’ve been binge-watching your videos for the last three days. You make it all so very simple and clear. Thank you.

@peterswrath8806 2 года назад

man if only my cs class was set up and taught like John. he explains all these topics, in the best simplest ways! love these videos!

@crookedcrowe9215 Год назад

I have a test coming up tomorrow and this guy is literally saving my life by making things simple and clear to understand. THANK YOU!!!!!

@shahoodgmail 2 года назад

Your tutorials are bingeworthy. I already know and use Java but in all of your tutorials, I do get to learn a thing or two. Keep up the good work! 👍🏼👍🏼

@miler_2260 2 года назад

This is absolutely amazing! Your explanations are so clear and straight to the point... You have got a very special skill there my friend, good work!!

@dibjr 2 года назад

Thank you, John! Your videos are concise, clear, and well presented. I really enjoy them!

@Naruto_Uzumaki_ 5 месяцев назад

I just wanted you to know that you're making a great difference in my academic life Mr. John! I appreciate your channel a lot!!

@ChickensAndGardening 10 месяцев назад

I've been doing Java since the late 1990s and this tutorial still taught me a thing or two. Good job!

@youthought878 2 года назад

I don’t understand how you can explain this stuff so easily. Seriously a true talent. Can’t thank you enough for the videos

@DirectNRG Год назад

never subscribed that fast in my life...Straight to the point, easy to understand. keep it up!

@ceciliacastro3093 10 месяцев назад

This video was really helpful. I´m studying engineering and I understood more in your 10 minute video than in a whole programming semester. Thank you form making student´s lifes easier.

@azadassis3669 Год назад

I have recently discovered this channel, and to be completely honest, it's an awesome channel to learn from. I have seen many channels teaching Java, but this one is different, the way the John teaches is captivating and holds your attention throughout the video. The videos are informative yet concise, and everything is presented clearly and accurately. I have been going through all the videos.

@mattmalan6859 2 года назад

Thank you so much! I've got this massive project due in a few days!

@BronkoBanane 2 года назад

straightforward, structured and contains the essentials. Thanks for this good video!

@Devivl Год назад

One of the best. Short and clear. Thank you, John!

@IralaPraveen-ku6zr 13 дней назад

you make to flooded lot of content into our brain in just a few minutes.thank you John.

@legendarybond4779 6 месяцев назад

I stumbled across some of your youtube videos as I wanted to understand more of Java. Thanks alot for these uploads!

@ayushsaxena3511 2 года назад

It's absolutely brilliant to watch your videos.. Loved the way you present things with such a simpler approach..

@rafaelcruz8966 Год назад

Seriously helping me get back in the groove for advanced data structures thank you 🙏🏽

@glenn8781 2 года назад

Brooo.. I love you so much! You bring a new, exciting and deeper understanding to Java. You have a unique ability to put things in a really interesting way! Looking forward to seeing more videos from you on Java concepts. Your channel will surely grow exponentially!

@popularcoffee9141 2 года назад

love the topics you discussed! they are what i would wonder but too lazy to dig in. big thank you to that! (and the clear explanation as well)

@calabert 3 дня назад

I want to truly thank you. You're helping me a lot. Your way to explain things is clear and to the point. Very easy to catch tricky concepts with your tutorials. Thanks! new sub :)

@hassanlearning4086 Год назад

Spent hours reading book but explained it so simply. Thank you.

@flytoinfinityvivi 13 дней назад

This video literally equals to an hour of studying trying to understand Map. You are amazing! Please never stop what you are doing. You actually make us beginners understand and well hopefully making us the future IT people (:

@RolandMurdoc 10 месяцев назад

I love the way you explain Java Subjects, you make me feel like it is not really that hard.

@user-lj9sq6lr5v 6 месяцев назад

My man, I think you are the only one who explain this so easily to understand.

@evgenystep8897 7 месяцев назад

Super easy explanation thx to clear out how to easily use HashMaps!

@Quantum_in_Java 2 года назад

I am super glad that I discovered this channel . Your videos are precise, to the point and very easy to understand (especially you way of explaining ) . Thanks a lot sir. Saviour of semester exams. 👍🏻

@stevenschelling8452 2 года назад

This is truly some of the best coding instruction I've found online

@szaryn 2 года назад

Yo! Clear, straight-forward, and fun explanation. Thank you so much, John! ^^

@HatTrick4030 Год назад

Amazing!! understood HashMaps within 5 minutes 😎. Super Thanks

@PrajwalYP2001 8 месяцев назад

I like the way of simplicity in explaining the HashMap topic. 👍

@saronabi1387 Год назад

U always make things easy for us , really am impressed with your courses, thank you so much for helping us!

@davishek7 2 года назад

Hope text books had this type of explanation. Great videos John. Refreshing my Java knowledge after 2 years of not using it.

@GiosBordoli 2 месяца назад

This is exactly the video I was looking for! Thank you!

@rajesh_gottimukkula Год назад

Thank you John for such crisp and clear explanation.

@karthikm5507 2 года назад

Crisp and clear. Really liked the way you explained.

@venkat757 2 года назад

Man... You are hidden diamond 💎 in RU-vid and I found you very late..... You deserve more views than any other java related videos.... I am from India.

@shoaibaltaf705 2 года назад

I tell you now. You will become top code RU-vidr

@CodingWithJohn 2 года назад

Thanks for the words of encouragement and thanks for watching!

@jakingsarchly6433 Год назад

Couldn't ask for a better teacher @ John. Thank you!

@vijivenkat9414 Год назад

I just subscribed to the channel just watching one video, so specific, clear concise..keep rocking..

@justinbanza4751 2 года назад

Thank you very much for this video. it is very nice to learn with an enthusiast teacher.

@Rowa_n 2 года назад

this is very helpful! thank you so much for making this tutorial! it was easy to follow

@Diana_13. Год назад

A huge thanks to you.The way you talk is so clearly also for none English speakers...🤝👏👏👏

@dsnewby Год назад

Fantastic video and such a well put explanation, easy and fun to follow along. Thanks a lot!

@simbarashemaunga5575 7 дней назад

The Java content delivery here is just top notch!

@sweetshoez 10 месяцев назад

quality! thanks for getting to the point. coming from javascript, python, and ruby it was insane to me that you can't just make a key/value pair "object" just using curly braces and half a line of code

@pandadoskoi 7 месяцев назад

Thank you so much. I certainly had my struggles to understand what Maps in Java are and what their purpose is, my scripts from university read like messages from outer space... but now I at least have a clue to get further in learning. I felt so stuck with this topic and felt so stupid because everyone said "oh, maps and hashmaps are so easy". Again, thank you effin much. Left a like and sub! :)

@pedroaboffa 2 года назад

man please.. please keep it up with ur videos.. plsssssssssssssssss they are amazing.. I am in the middle of a java bootcamp and they are really helping me out

@CodingWithJohn 2 года назад

Thanks Pedro! I appreciate all the comments, keep up the learning!

@pedroaboffa 2 года назад

@@CodingWithJohn amazing !!! will watch all ur videos and also I am sending them to all my bootcamp friends..

@twinklehingu2757 2 года назад

This was very helpful and easy to understand. I really appreciate it, Thank you so much.

@jyotvkathalu7901 Год назад

It’s a very crisp and detailed explanation… i was waiting for you to explain iterating maps … thq for video

@aryanjoshi9703 3 месяца назад

in ten minutes i am able to learn which others explain in double or triple amount of time and comprehended 95% of the video content , thanks to your explanation , thank you john sir

@idreesalao6155 2 года назад

This was very helpful and easy to understand. I really appreciate it, thanks.

@CanopusInfinity 2 года назад

Thank you for uploading such great content and educating us. Your explanation is so precise and concise.

@gideonob 2 года назад

Best video I've watched on any Java data structure! Thank you sir!

@garrickreynolds2015 2 года назад

This is an amazing and clear explanation. Thank you!

@godiloverock Год назад

Helpful, and explanatory! Thanks for the video.

@gerdsfargen6687 Год назад

This guy rattles off it like an expert juggler. He is SO cool! We all could use the master communication skills like him here...especially for teaching programming! You got my vote!

@xiangyuliu9629 2 года назад

pretty clear, cut to the chase, love this video, subscribed already.

@ismoilova_shahina Год назад

thanks John for this well-explained tutuorial

@hey4077 Год назад

Thank you very much, I appreciate your videos and the fact that they're for free!

@sigfigronath 2 года назад

This is so simple wow, thanks John!

@jyotibansode5067 2 года назад

Hey John, thanks for the videos short and well explained, more forward to see ur videos on Spring Boot, Microservices, RestAPI........

@ohmarianito4617 2 года назад

Very good videos, I am already watching many of them, you explain very well, I hope your motivation continues! +1 follower

@BernardVisagie 2 года назад

2:28, now in C# you can infer even more, and you would be able to write your Java as: HashMap empIds = new();

@jesusbrito699 Год назад

Hi John!! your video are awesome!! you help me allways, thanks for this. Argentina

@michal1798 7 месяцев назад

You make the best java toutorials on youtube imo👍

@dost27 Год назад

Very simple and easy to understand the concept of Map. Keep it up

@ahmetalperenyildirim6184 Год назад

Great content! sharp clear, thank you for sharing, you teaching us a lot!

@harikrish07 7 месяцев назад

Thank you sir. Nice explanation ❤

@nerodant85 Год назад

Thank you for making it easy to understand

@personontheinternet2164 2 года назад

Really love the presentation and energy of this channel!

@taldennis8058 2 года назад

Excellent video as always, thank you very much John you are the best!!

@whiteliszt8805 2 года назад

Tnx a lot for ur videos, i really enjoy how u represent the agenda and especially ur english

@justinbanza4079 2 года назад

Thank you John, Very clear

@Mynarski Год назад

Straight forward and concise.

@brilliantdecember Год назад

Very well explained. Glad to have found your channel.

@TheCurious36 Год назад

coding with john. you are a good man. thank you.

@TheStormtrooperrr 10 месяцев назад

Clear, no BS, concise. Just subbed

@ForrestTaft101 2 года назад

Brilliantly simple and concise. Subscribed

@evanpilling8429 10 месяцев назад

This is such an awesome channel. Thanks for the video!

@TheDoomCompany 6 месяцев назад

Thank you, this video answered my questions right away

@nethmiwijebandara3315 Год назад

Thank you. Well explained!

@idunsky Год назад

hey John, thanks for your videos, they're super helpfull it took you 10 minutes to explain a three hours lecture

@faroukmatamir Год назад

Really big thanks to you for your efforts, I really understand the topic when I watch you. Please hange on and you will reach a million sub soon

@everythingabout3479 3 месяца назад

Very nice channel . Actually clears the confusion

@valopezLA2Sc Год назад

Thank you so much. Very great explanation

@Garrison86 2 года назад

Awesome! This is Clear and easy to understand

@qusaiclasher4452 5 месяцев назад

You're the best. Your teaching is way better than my professor. Please keep uploading more useful videos like this one

@andrewchen861 Год назад

Thank you for the video! :) It was helpful.

@nzubehenry445 Год назад

you are so good at explaining things

@daniyageorge2008 2 года назад

Very nice video. Looking forward to see custom implementation video of hashmap and other data structures.

@liljj2k10 Год назад

The best explanation I ever came across

@Anonymous-ot2kk 7 месяцев назад

Very nice ! Thank you 🙏

@gevorgnersesyan4177 Год назад

Please do other data structures in Java as well. THE VIDEOS ARE AMAZING!

@TheJoannathon Год назад

Thank you for explaining it so well!

@Moon-Knight313 2 года назад

Awesome explanation! Thanks John! Keep going!👍