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!
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.
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.
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.
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 ❤
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?
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 🙏
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!
John, thank you so much for the Java lessons. As someone who is not fluent in English, having to read the error-filled TH-cam 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!
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.
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
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.
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.
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.
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.
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
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
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?
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
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.
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?
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
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!🤗
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.
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.
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!
You have to have way more subscribers for the quality of content you're putting out. Crystal clear presentation of concepts..
I'll have to start making worse videos till I get more subs!
What are your thoughts on using var for local variables? Example: var myCat = new Cat();
Hey John, i am missing new videos!!❤️
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.
The fact u used breaking bad char names made u the goat,thanks for this John
Not all heroes wear capes. John is out here saving grades.
Not all heroes wear a cape, John out here is making DSA a piece of cake.
Not all heroes wear capes. John is out here helping crack interviews
Joh out here helping me not get fired from my job 🥲😝 Thanks john !!
Not all heroes wear capes. John is out here helping me crack Google Cloud system
this is so true
Thank you, John! Also, I loved the Breaking Bad characters being incorporated into the lesson.
Woh, I did not make the connection to the show and the sample names. I was too focused on understanding the concepts. Good eye!
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!
In my opinion, John is the best programming mentor on TH-cam platform! Thank you so much, John!
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.
Awesome, I'm glad it helped!
What i couldn't understand from 1 hour long lectures,this guy just taught me under 30 mins hatss offf
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.
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 ❤
new subscriber here, your explanation is 80% more easier to understand than our teacher
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 😂
Awesome, hope it helps!
As a senior dev, i must say, watching your videos is very relaxing. Thank you.
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?
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 🙏
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!
Man respect ++ , The clarity you gave was commendable !
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
Good luck, let us know how it goes!
Great content as always, Please make a tutorial about java futures.
John. Keep them coming. I’m from india. Haven’t seen anyone who speaks organised. Precised as you do. Love your work. Bless you ❤
Thanks John, with you I improve my code and my English. Greetings from Argentina
John, thank you so much for the Java lessons. As someone who is not fluent in English, having to read the error-filled TH-cam 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!
Que legal, Você siga em frente
Found at right time. Just when I was feeling low and bored but wanted to explore set interface. Good explanation and examples thankyou
Da man is back! This dude has saved my Java bacon many times! These videos are the best.
Thanks!
Mmmmm
Java bacon
**Cue Homer Simpson with mouth watering*
@@vladthe_cat mmm smoked objects.
Don’t usually comment but great video , I learnt a lot and I can see the connection with data structures better. Thank you John!
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.
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
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.
Forward to 1:38
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.
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.
your videos are helping me understand my Java coursework at Uni! Thanks for all you do John!
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
Very good vid. It covers all the good stuff in plain English. Thanks John.
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.
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 (:
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
Understanding interfaces is crucial to grasping this. So make sure you watch his video on it.
❤ very knowledgeable video ❤thanks
This guy is way too underrated! He’s the real G.O.A.T
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
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
Love me some Breaking Bad mixed in with the examples. Thanks John!
Really loved the breaking bad context! kept me hooked up till the end.
you dropped this king 👑
His majesty 😌
One of the best tutorial | Complete and Clear with examples
Your teaching style has performance edge, great job! 🕹
i enjoy programming whenever i watch your videoss
Hi, John! Could you make a video explaining encapsulation? Your explanations make it so clear.
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?
Give a like before watching the video! And in respect to your work watching the mailgun presentation without skipping it!))
Love your courses. Needed a reminder about sets and you made it crystal clear 😊
Ran into these at work today, so this is a nice coincidence! Thanks for the great tutorial
Simply Perfect and Perfectly Simple to Understand! Thanks a Ton!
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
Great Explanation. Plus You are a great fan of breaking bad :D
Your explanation of Java makes it easier to understand. Thanks, John!
this is the best video about Set I have ever seen before, thank you so muchh
John is obviously a Breaking Bad fan. Thanks for this genius video explained so succinctly.
John you are the best java developer i know, thank you so much for share your knowledge.
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
bros' videos are just gold
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.
Thanks John, great clear concise videos. Perfect for a newbie and quick refresher.
Love your videos, learned daily new topics, though the I am familiar with the topic, Presentation is crystal clear.
love the way u explain each and every details in your programs 😍
Amazing pedagogical skills you have sir. Nice work and thank you
Hey John, great video as always.
Any chance for a Comparator and Comparable video?
Thank you!
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?
With your videos Java does not look scary anymore;)
Absolute legend over here
Thank you
My favourite Java Guru❤
Thanks John, it was quite helpful to remember the working principle an difference between these.
Your videos are really good and concise, gives me insight enough. Thanks.
100 times thank you!
I learn English with and Java too
So happy to find your channel here
Such a great videos!!! 🙂
You made it look easy. Thank you John
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
Thanks this was super easy to understand
It's called a wow video❤ thanks for making it easier
Thank you for the video. I have a question though: When should we use a list and when should we use a linkedSet?
I loved it. I want more videos on collection frameworks. Also more on file handling and swing awt. Jdbc everything. I love your videos.
Great tutorial as always John! Can you consider doing suffix arrays? I still struggle understanding it 😅
I really like LinkedHashSet. I use it quite often. Sometimes for no other reason than to make debugging easier.
Very informative and usefull video. Cheers from Poland.
thank you john , perfect explination . i can see that you are a big fan of breaking bad , that helped me to get more focused with you ;)
John, you're VERY cool at explaining complicated things in simple words. Thank you so much! Very cool!
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!🤗
Very good explaination sir..🖖🖖
I swear you are the best John 👊🏾
Hi John, this is amazing, are you ruining any specials for your course?
Thank you for clarification. Need your full course but it's expensive for me... Hope there's a sale one day.
Love your videos. So clear 🤌✨
I love your all videos. I improve myself with you Genius
thankk you this will help me in my study
I love your way of explaining these concpts! Thanks John!
Thank you John! It would be great to have some videos about Gradle and video about Kotlin programming
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.
Thank you so much for the detailed explanation this is a gem 😍
Great video! and love the reference to breaking bad!!
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.
Love your videos! They help a lot! Could you consider making one for lambda and stream?
Thank you John! Your videos are really helpful :) Could you please make a video about HashCode and equals contract?