Set and HashSet in Java - Full Tutorial

[@CodingWithJohn]

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]

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

[@CodingWithJohn]

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

[@kcrowe8583]

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

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Hey John, i am missing new videos!!❤️

[@CodingWithJohn]

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.

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

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

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

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

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

[@zfazzershroudvietcynide64e58]

this is so true

[@xbz24]

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

[@juanjaimeszuluaga]

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!

[@galdamez3]

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.

[@anubratsahoo1351]

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

[@socaljusticewarrior558]

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]

Awesome, I'm glad it helped!

[@ГульхаёМусурмонова]

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

[@CoffeeDev749]

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

[@galdamez3]

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

[@shafaatalizee8182]

Hi Dear Sir ! I'm associat java developer, and I love the way you delivered the topics, especially Hashset and HashMap because I was so confused on these before I watched your tutorials Thanks ❤

[@evilman667]

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

[@telerobotic]

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!

[@trustytrojan]

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 🙏

[@guzinreidelas]

John, thank you so much for the Java lessons. As someone who is not fluent in English, having to read the error-filled KZbin 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!

[@Robin-hi4vj]

Que legal, Você siga em frente

[@royalmech14]

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

[@zfazzershroudvietcynide64e58]

new subscriber here, your explanation is 80% more easier to understand than our teacher

[@jordanparsa7713]

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]

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

[@integralcialbay4633]

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.

[@jagan107]

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

[@Firestar311MinecraftMore]

Hello John! While I am an experienced Java Developer, I like watching other videos and tutorials to see what is either new, or if I missed anything as I am self-taught (Or just for fun because it is entertaining and informative like your videos) and around 6:29 when you were talking about ordering being maintained is somewhat untrue ArrayLists do not maintain order and just like HashSet, they can be in whatever order Java decides to put them in. Generally speaking, Lists do maintain order a bit better than HashSets. The collections for both List and Set that maintain order is LinkedList and LinkedHashSet respectively. These will maintain their order of being added.

[@CodingWithJohn]

Hello, thanks for watching! I have to disagree though, ArrayList does maintain its insertion order. Feel free to Google around and look though. I'd be curious to see where you saw that it doesn't.

[@federico42o]

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

[@aaron10k]

my go to guy for java. I have an interview coming up at a hft firm if I get it I owe it all to u mr . John

[@CodingWithJohn]

Good luck, let us know how it goes!

[@letampatrickbienwi4610]

Don’t usually comment but great video , I learnt a lot and I can see the connection with data structures better. Thank you John!

[@anpadjahil9711]

Thanks a lot for the simplicity! One question: while using hashset which way should we prefer and why: 1 - Set s = new HashSet 2 - HashSet hs = new HashSet

[@drcl7429]

it doesn't really matter. The advantage of creating a set variable is that it could potentially reference any of the types that implement the set interface. A hashset variable can only reference hashsets.

[@abhijeetvdsh]

One of the best tutorial | Complete and Clear with examples

[@mastershonobi110]

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

[@ah_dev]

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

[@sachinsonawane3767]

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

[@kotyo82]

beautiful explanation , i was worrying about this subject when i was listening my instructor several times ,; but after i found this video , Johns explanation ways very clear , understandable ,also polishing other knowledge of Java , if like button was real , i could destroy it , that much i like this .....thanks John

[@drcl7429]

Understanding interfaces is crucial to grasping this. So make sure you watch his video on it.

[@gerdsfargen6687]

Da man is back! This dude has saved my Java bacon many times! These videos are the best.

[@CodingWithJohn]

Thanks!

[@vladthe_cat]

Mmmmm Java bacon **Cue Homer Simpson with mouth watering*

[@gerdsfargen6687]

@@vladthe_cat mmm smoked objects.

[@mislam2565]

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

[@MarianaRomeo-o1k]

Im a newbie and hash sets and sets always scared me! LOL now that you have taught me, I am seriously baffled.... Thank you so much

[@-karter-4556]

you dropped this king 👑

[@gerdsfargen6687]

His majesty 😌

[@olenashov5214]

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

[@NamNguyenHoang]

this is the best video about Set I have ever seen before, thank you so muchh

[@antonmariadas7747]

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

[@limiakejelu]

This guy is way too underrated! He’s the real G.O.A.T

[@SemiWagner]

I can't believe you just uploaded this video haha I am studying CS and this week's homework has to do with Collections and HashSet 😂

[@CodingWithJohn]

Awesome, hope it helps!

[@kcayushma]

Forward to 1:38

[@gab1crazy]

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 (:

[@martins2462]

Good video. I would add, however, that instead of the natural ordering of type E, TreeSet can use a valid Comparator for type E, that is of type Comparator

[@mannieg88]

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.

[@tabsc3489]

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

[@m_i_g_u_e_l_]

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

[@motionattached]

Your teaching style has performance edge, great job! 🕹

[@karlcossaboon7072]

Absolute legend over here Thank you

[@nabeelrehman5451]

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

[@semilife]

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

[@whiz-code]

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

[@mikeyyy_xam]

i enjoy programming whenever i watch your videoss

[@petergazer8321]

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?

[@MatthewWeiler1984]

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.

[@ronneyismael5804]

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

[@davidwangonjo2041]

You made it look easy. Thank you John

[@arthurmagamedov3179]

Give a like before watching the video! And in respect to your work watching the mailgun presentation without skipping it!))

[@igor9919]

bros' videos are just gold

[@ArturBerkut]

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

[@Timeless_Trader]

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

[@wikituby]

you are simply the best, can you please try to make videos more often, like twice a week or if possible three times a week

[@Devivl]

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

[@MahmudulIslam-l9x]

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

[@khushboosoni4214]

love the way u explain each and every details in your programs 😍

[@kronosssssss]

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

[@pranit_1643]

Really loved the breaking bad context! kept me hooked up till the end.

[@chazzhorn7688]

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

[@lootster]

John is obviously a Breaking Bad fan. Thanks for this genius video explained so succinctly.

[@abhishekgowlikar]

Love your videos, learned daily new topics, though the I am familiar with the topic, Presentation is crystal clear.

[@rashmiraj5269]

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

[@done_done_done_man]

Thanks this was super easy to understand

[@sadeepaalwis5938]

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

[@aidoka2000]

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.

[@sachintiwari6065]

❤ very knowledgeable video ❤thanks

[@michaelbistritzki7560]

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!🤗

[@gowsikhaadevasenabathy]

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?

[@surajverma-ut4kj]

My favourite Java Guru❤

[@ivaylokostadinov7543]

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

[@ObieR]

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

[@girishanker3796]

Love your videos. So clear 🤌✨

[@yelizkosar3478]

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

[@MzamoHerbza]

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

[@tipeon]

I really like LinkedHashSet. I use it quite often. Sometimes for no other reason than to make debugging easier.

[@nathanherder1414]

Love me some Breaking Bad mixed in with the examples. Thanks John!

[@jermainscott6973]

I swear you are the best John 👊🏾

[@laforever401]

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

[@summeray1]

Great and simple explanation! Thanks!

[@deykumar5433]

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

[@GusLapchatiy]

It's ordered by hashcodes of stored objects, if it's not a natural order it doesn't mean it's not ordered. Hashcodes can be rehashed as hashset grows and on second execution you may get a different order but anyway, technically it is sorting objects by their hashcodes.

[@polimorphic13]

Excellent video as always. Thank you John!

[@adityapradhan8474]

Very helpful video. You are a life saver man

[@raisgamesnz325]

Thank you so much for this tutorial!

[@FaridHasanaliyev]

Such a great videos!!! 🙂

[@faroukmatamir]

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

[@muradquliyev6448]

Thanks!

[@humzakhan766]

Thank you john. Loved It. God bless you

[@denzashleypascua1392]

thankk you this will help me in my study

[@humairahalimi3741]

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

[@sanchalisharma9149]

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

[@crixi__]

perfect explanation, I love it

[@Hianfita]

Great content and incredibly well explained! Thank you sir!