Set and HashSet in Java - Full Tutorial

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Full tutorial on Sets and HashSets in Java!
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What exactly are Sets and HashSets in Java? How are they different? How do you use them, and how are they different from Lists and ArrayLists?
We'll learn all about Sets and HashSets (and other types of sets like TreeSets and LinkedHashSets) in this video.
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:

11 дек 2022

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Комментарии : 346

@CodingWithJohn Год назад

Thanks to Mailgun for sponsoring this video! Head to mailgun.com/john to try Mailgun free today. Let me know if you have questions, or ideas for another video!

@praveenrock3417 Год назад

You have to have way more subscribers for the quality of content you're putting out. Crystal clear presentation of concepts..

@CodingWithJohn Год назад

I'll have to start making worse videos till I get more subs!

@kcrowe8583 Год назад

What are your thoughts on using var for local variables? Example: var myCat = new Cat();

@wellingtondefassio4435 Год назад

Hey John, i am missing new videos!!❤️

@CodingWithJohn Год назад

Sorry! I had a minor surgery that I'm recovering from at the moment so I've been delayed. But don't worry, I haven't gone anywhere, so once I'm doing better I'll be back at it.

@evelinechaza6786 Год назад

Not all heroes wear capes. John is out here saving grades.

@tarunsoni6971 Год назад

Not all heroes wear a cape, John out here is making DSA a piece of cake.

@pradeepyadravi2533 Год назад

Not all heroes wear capes. John is out here helping crack interviews

@poppincena5909 10 месяцев назад

Joh out here helping me not get fired from my job 🥲😝 Thanks john !!

@DucNguyen-sd4mn 5 месяцев назад

Not all heroes wear capes. John is out here helping me crack Google Cloud system

@xbz24 Год назад

The fact u used breaking bad char names made u the goat,thanks for this John

@CoffeeDev749 Год назад

Thank you, John! Also, I loved the Breaking Bad characters being incorporated into the lesson.

@galdamez3 10 месяцев назад

Woh, I did not make the connection to the show and the sample names. I was too focused on understanding the concepts. Good eye!

@antonmariadas7747 8 месяцев назад

Love your courses. Needed a reminder about sets and you made it crystal clear 😊

@niictar Год назад

It’s amazing having access to Java tutorials with the same quality and enthusiasm other YT channels give to the likes of Rust or the latest JavaScript framework. Thank you John!

@petergazer8321 Год назад

Thank you for all of your videos! You break it down in such an easy way to understand. Can you do a video sometime on serialization with examples and when to use it?

@juanjaimeszuluaga Год назад

Hi John! I'm a student of systems engineering. I'm from Colombia and your videos are making me improve in this language. Thank you!

@aidoka2000 Год назад

Awesome, concise and clear explanation. Thank you John. I even enjoy watching the topics I already know, because I just love your way of explaining them.

@ah_dev Год назад

your videos are helping me understand my Java coursework at Uni! Thanks for all you do John!

@isaacwhiz Год назад

Am really really satisfied with the terms you use and the implementation of the concepts in a simple and easy to understand format. Thank you, Thank you, Thank you

@user-tf6no2wr2u 10 месяцев назад

In my opinion, John is the best programming mentor on RU-vid platform! Thank you so much, John!

@tabsc3489 Год назад

Ran into these at work today, so this is a nice coincidence! Thanks for the great tutorial

@trustytrojan Год назад

even though i knew all about java sets, i still watched this video to appreciate how well you teach these concepts. keep it up youre doing good work for the java community 🙏

@mannieg88 Год назад

Thank you, John, your explanations are very straightforward and easy to understand. I like the way you explain in the end how we can use data structures in real-world problems.

@jetsfan8437 Год назад

This was great. Can we get a video explaining interfaces vs classes and APIs?

@galdamez3 10 месяцев назад

I had to learn Java for a new job last year and while many of the concepts like Hash Sets have one-to-one parallels in other languages I’ve used, I’ve yet to read up on how to implement them in Java. This tutorial easily saved me a couple of hours of textbook reading. Keep up the great content.

@chazzhorn7688 Год назад

I love your way of explaining these concpts! Thanks John!

@mislam2565 4 месяца назад

Simply Perfect and Perfectly Simple to Understand! Thanks a Ton!

@anubratsahoo1351 11 месяцев назад

What i couldn't understand from 1 hour long lectures,this guy just taught me under 30 mins hatss offf

@olenashov5214 Год назад

Your explanation of Java makes it easier to understand. Thanks, John!

@sadeepaalwis5938 Год назад

Thank you so much for the detailed explanation this is a gem 😍

@mastershonobi110 Год назад

Very good vid. It covers all the good stuff in plain English. Thanks John.

@jordanparsa7713 Год назад

Hey John! Your videos are helping me get through the most important internship of my life. THANK YOU. Humble Request: can you make a video covering serialization/deserialization?

@ayushmaansural4896 9 месяцев назад

Man respect ++ , The clarity you gave was commendable !

@raisgamesnz325 10 месяцев назад

Thank you so much for this tutorial!

@MzamoHerbza Год назад

Absolutely clear and awesome quality, John. I love the content

@ObieR Год назад

This is awesome. Your videos have helped me so much. Thanks for all of your work.

@federico42o Год назад

Thanks John, with you I improve my code and my English. Greetings from Argentina

@semilife 3 месяца назад

Thanks John, great clear concise videos. Perfect for a newbie and quick refresher.

@socaljusticewarrior558 Год назад

Another high-quality video, John. It actually came at the perfect time for me. I was making a whole lot of spaghetti code with ArrayLists and for loops, but then I realized that I need to focus on learning data structures for a while. This very lesson just happened to be applicable to a project I'm working on right now. I'm messing with an API that gives me random cat facts, and I've been getting a lot of duplicates.

@CodingWithJohn Год назад

Awesome, I'm glad it helped!

@Timeless_Trader Год назад

Thanks John, it was quite helpful to remember the working principle an difference between these.

@polimorphic13 Год назад

Excellent video as always. Thank you John!

@girishanker3796 Год назад

Love your videos. So clear 🤌✨

@abhijeetvdsh 3 месяца назад

One of the best tutorial | Complete and Clear with examples

@humzakhan766 11 месяцев назад

Thank you john. Loved It. God bless you

@ivaylokostadinov7543 Год назад

Hi, John! Could you make a video explaining encapsulation? Your explanations make it so clear.

@sachinsonawane3767 6 месяцев назад

Found at right time. Just when I was feeling low and bored but wanted to explore set interface. Good explanation and examples thankyou

@davidwangonjo2041 Год назад

You made it look easy. Thank you John

@user-un3qd6tv7l 11 месяцев назад

Your videos are really good and concise, gives me insight enough. Thanks.

@jagan107 Год назад

Thank you John for make me understanding difference in using Set() and HashSet() i had this doubt for longer time. Time in the video: 3:12 to 4:21

@satricon 6 месяцев назад

Awesome information! Thank you so much!

@deykumar5433 Год назад

Hi John, I love the way you teach. I really appreciate your hard work and effort. It would be very helpful if you make a series on Dynamic Programming. You have that ability to make complex code easier. Thank you so much for your wonderful videos

@evilman667 9 месяцев назад

As a senior dev, i must say, watching your videos is very relaxing. Thank you.

@integralcialbay4633 11 месяцев назад

Thanks for the great video! I really enjoyed and learned a lot from it. Just wanted to add one little thing about the difference between HashSet and TreeSet: Elements of a TreeSet need to implement either the Comparable interface or they need to come with a Comparator, since the TreeSet sorts them out whereas HashSet just places them based on HashCode. This is a very small difference, but it can be important sometimes.

@crixi__ Год назад

perfect explanation, I love it

@Devivl Год назад

John, you're VERY cool at explaining complicated things in simple words. Thank you so much! Very cool!

@nabeelrehman5451 Год назад

Great content as always, Please make a tutorial about java futures.

@faroukmatamir Год назад

Thanks John, Your video is very helpful to me, please keep it up .

@anwaralkadi6540 Год назад

You are really one of the best. Thanks a lot

@adityapradhan8474 9 месяцев назад

Very helpful video. You are a life saver man

@MatthewWeiler1984 Год назад

Thanks for the video. I haven't really used Sets in the past. Looks like I have some refactoring to replace instances where I used a List just to keep track of unique entries.

@taljune142010 Год назад

Thanks a lot! You really helped me.

@kronosssssss Год назад

Amazing pedagogical skills you have sir. Nice work and thank you

@summeray1 Год назад

Great and simple explanation! Thanks!

@Hianfita 5 месяцев назад

Great content and incredibly well explained! Thank you sir!

@rajenderprasad1193 Год назад

Thank you so much for this

@royalmech14 8 месяцев назад

John. Keep them coming. I’m from india. Haven’t seen anyone who speaks organised. Precised as you do. Love your work. Bless you ❤

@michaelbistritzki7560 Год назад

This is amazing! Now that I thought about it more deeply the idea is genius. I am studying the course on data structures and an introduction to algorithms and now I am thinking that it is possible, as you described at minute 13:15, to reduce the running time of searching for duplicates in a certain list from O(n^2) to O(n) just by using a HashSet. Thank you so much John for opening this thought to me, I will keep thinking about it in the future.Keep making more videos like this, it helps a lot!🤗

@laforever401 5 месяцев назад

Wow! What an amazing video! Thank you so much for this!

@karlcossaboon7072 Месяц назад

Absolute legend over here Thank you

@ksgirish1077 Год назад

Thanks for your content. A worth watch.

@gowsikhaadevasenabathy Год назад

Hi John, your videos are extremely helpful for me as I have joined a software firm after a long career break with no prior experience in Java. Can you please do a video on Persistence since there are not many videos on this topic?

@wendyduggins1154 Год назад

Great teaching skills, thank you!

@rashmiraj5269 11 месяцев назад

It's called a wow video❤ thanks for making it easier

@yelizkosar3478 Год назад

I love your all videos. I improve myself with you Genius

@aldoumene6201 Год назад

Great tutorial as always John! Can you consider doing suffix arrays? I still struggle understanding it 😅

@shaznd301 8 месяцев назад

An Excellent Video! Thanks.

@alphab5543 Год назад

Great, many thanks John

@denzashleypascua1392 5 месяцев назад

thankk you this will help me in my study

@jermainscott6973 9 месяцев назад

I swear you are the best John 👊🏾

@kyzuno5066 7 месяцев назад

Thank you professor!

@sumaiyaansari3105 9 месяцев назад

You are really great Sir!!

@ArturBerkut Год назад

100 times thank you! I learn English with and Java too So happy to find your channel here

@gab1crazy Год назад

maannn we just started studying hash and how it works and it's amazing. now I just found this video explaining it !!! THX SO MUCH (:

@user-ci9om8vi9f Год назад

Such a great videos!!! 🙂

@m_i_g_u_e_l_ Год назад

John you are the best java developer i know, thank you so much for share your knowledge.

@carlosginer2623 Год назад

Kudos to you John ! keep the good work

@humairahalimi3741 8 месяцев назад

Thanks, this video was great, Very easy and clear explanation!

@thomas_m3092 Год назад

Great video. Thanks John.

@sanchalisharma9149 Год назад

I loved it. I want more videos on collection frameworks. Also more on file handling and swing awt. Jdbc everything. I love your videos.

@muradquliyev6448 Год назад

Thanks!

@ronneyismael5804 Год назад

John the way you explain is so good that I don't need to study Java Documentation. Keep it it up. Please also make a video on Marker interface and discuss about cloneable and serializable interface

@funvideos6569 10 месяцев назад

Nice & Informative Video Sir .

@KrzysztofChrzan Месяц назад

Very informative and usefull video. Cheers from Poland.

@michael_scarn_ Год назад

Thank you John! Your videos are really helpful :) Could you please make a video about HashCode and equals contract?

@gopalkannan4934 Год назад

Thank you very much.

@guzinreidelas 10 месяцев назад

John, thank you so much for the Java lessons. As someone who is not fluent in English, having to read the error-filled RU-vid captions and follow the lesson at the same time, I actually understand your explanation better than my own professor's. Sending a warm embrace from Brazil!