Java Enums Explained in 6 Minutes

All about Enums in Java - Full tutorial with concrete examples.
Enums (short for Enumerations) are used in Java to hold types that have a certain finite set of values. But if you're new to enums, they can be a little confusing. In this Java beginners' tutorial video, we'll talk all about enums - how you can create your own enums, how to use them, and in what situation using an enum makes sense in your code. All in less than 6 minutes!
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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.
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[@ScottishKoala]

How does this man manage to break down these concepts so effectively, especially at such a quick pace?! These videos are a godsend. The way you add a small piece of code then fully explain why you added it and what it does makes the code extremely easy to understand. The humour along with the simple but creative programs is also a huge plus, very engaging. Thank you!!

[@howtomath1245]

Can you make a long tutorial about what a junior Java developer should know 100% to pass an interview or cover some core topics about it or a playlist of videos? Your videos are pretty understandable and informative, thank you.

[@howtomath1245]

Because when I look up some vacancies, it’s like you should know almost everything from core to spring and other stuff, it’s pretty hard to concentrate on one particular topic

[@CallumAtwal]

@@howtomath1245 I'm in the same boat. My approach to it is to ensure I know the core fundamentals fully (beyond what is enough to get by). Hence why I've watched a video on such a simple topic in Java, enums. I've always just used enums in the way hes shown but it certainly helps to re-enforce what you know when you watch to back. Doing the same with other trivial and basic java concepts helps strengthen you. As for spring specific things, dummy projects are the way to go. Setting something up yourself. Creating a few difficult scenario's which require spring specific solutions. I work with spring day to day at work but hardly ever will run into edge cases that an interview might ask for. Good luck!

[@TheDecodee]

I adhere to the request, your videos have helped me a lot to understand java, but i would really like to see a video about contents that a jr java would need to know to get a job

[@devilscarrybach8672]

I can help you. If you know basic core java then will take 1 week to get ready for job.

[@TheDecodee]

@@devilscarrybach8672 i would really appreciate your help! How should we do?

[@AhmedMusrin]

We had to implement the 2nd part of your video(with grades instead of cereal) as part of my exam(on paper). Without you, I would not have gotten it correct. Thank you!!!

[@jordhan]

I was trying to understand Enums in practice to implement in my C# code, but a Java video nailed it for me. Now I understand when my teachers said "learn the idea, not the syntax".

[@pranavnyavanandi9710]

Language-agnostic as they say.

[@larryd9577]

The mutability of Enum fields is a nugget of wisdom, which i didn't anticipated. Thanks!

[@valoriebroderick]

These tutorials are amazingly clear and understandable. I'm so grateful because that's not always the case with coding tutorials.

[@karlcossaboon7072]

Ridiculously helpful. As well as short simple and to the point. thanks.

[@CodeMonkeyy]

Your videos are fantastic! Well thought out and prepared. Easy to understand for beginners. Best out here on KZbin

[@DaBestOhYeah]

I am so glad that whenever I don't understand something in java, your videos are top on the list!!

[@hangyeollee-creuset5108]

Love your videos. John. Thank you so much for making the videos. It is pleasure to see you having fun in Java.

[@sss_az1063]

You’re making my life much easier thank you so much man i really appreciate you

[@MrDarshD]

Thank you for sharing! Love the names you give to them and also the shortcut tips!

[@santuyou1]

Clear and crisp. Thanks for video. Subscribed.

[@faroukmatamir]

Thank you John, please keep going with new videos and don't stop, I am learning a lot from you....

[@remembert0f0rge]

Man your videos are so clear even to me, who can't speak english at all

[@Drogo681]

Straight to the point, and very pedagogical. I have already subscribed, but I like is coming right up.

[@micleh]

Hi. I've only recently become aware of your KZbin channel, and I wonder why the KZbin algorithm hasn't recommended your channel earlier. I like your succinct videos a lot, and they are superbly suited for my computer science school courses, since Java is the language students learn in higher education in Germany. Thanks a lot for the high-quality content.

[@thalibmuhammad9519]

you can help by like and subscribe, that boost the youtube algorithm

[@mahdinouira3261]

it could be because you are subscribed to many channels, try using two account (it can provide SOME of what you need )

[@janfeyen592]

Hey, you may not remember me, but I watched one of your I/O java videos a couple of weeks back and I just wanted to say thanks for the clear straight forward but most importantly amazing Java tutorials you've put out

[@Habijob]

Bless you and your video(s). I started studying for the OCA and your videos are a big help in understanding the dry text from the book in minutes (literally), haha.

[@isaacweber7398]

Much gooood John. God Bless you! Keep doing that. It's helping me a lot.

[@mahodaadikari4116]

Another simple and amazing explanation as always. ❤💯

[@muhendis_]

ctrl shift x = this was an awesome knowledge 😄🙏🏻

[@seeulater8753]

Your videos help me a lot. Thank you so much!

[@gabrielfono844]

sir thanks so much I really appreciate I taught myself frontend development two years ago and I got hired recently as backend engineer. since I recently started learning java , I was struggling on something on my assignment and this video basically explain everything. your example is similar to the problem I have . I right away subscribe and will recommend this channel to my friend I want to say thank again

[@jarveyd8660]

You broke it down really well!!

[@yogeshvasudevan]

Great explanation 👏👏..Thank you for the refresher👍👍🙏

[@Coccoutube]

Thanks as always John! My knowledge++

[@semilife]

Nice on John, short clear and detailed.

[@mustapharaimilawal8053]

Great tutorial, as always. Thank you sir.

[@122fathom2]

really short and clear, brilliant.....

[@Wilespro1]

Man the greatest tutorial of all time

[@HatTrick4030]

Amazing! now I don't have to watch a 30 minutes of enum video tutorial again on a purchased bootcamp on Udemy. just simple and and understandable. all that matters to us is to understand the syntax of a new lesson and master it and then we can build our projects with details ourselves. the problem with other instructors is that they involve too many peripherals to the main lesson and we understand all except the main topic :D

[@flaviuvanca9289]

Hi John, another nice thing about enums is that you can use abstract methods to customize the constants :)

[@jonathanalcantara7347]

Great explanation, thanks!

[@codewithankush9753]

Please make Java development full course, they way you explain it's really easy to get understand concept. Thank you

[@mikaznavodya7277]

Thank you, your explanations are very clear ❤

[@rishabhshah1218]

Nice and quick tutorial. Thanks

[@ToshiroKiss]

Dude, love your channel. saluds from Brazil

[@bhaweshpandey4306]

This was helpful 👍, thanks !!

[@BunnyboyCarrot]

Nice and concise, awesome video!

[@mashooly_kr7192]

Thanks it was really helpful!

[@OmarMendozaKS]

What a heck of explanation man, moreover super creative using cereal, thank you

[@jooncco]

Helpful as always

[@windz643]

I love your way of teaching

[@4inchezz199]

Thanks man, this actually helped me a lot :D

[@withgrowinginsanity198]

wow! A gold nuget of information. thanks a lot.

[@starry6685]

Thank you for the videos!

[@ManhPhuGiang]

Thank you, great video.

[@pranavmahajan4190]

You are totally awesome. I liked the way you explain

[@Imperfectwow]

Great content John thanks

[@greatjobbuddy]

These videos are so great.

[@uchihalayan3435]

thank you brother this was helpful

[@Devivl]

Thank you very much, John! 🙂

[@pietro-study]

love ur tutorials! Very quick, u cover most of it and it's fcking understandable!

[@hanseuberalles5063]

Loved that! Any tutorial for Strams please ?

[@gergelynemeth8244]

Hey Jon, great video as always, love the way you explain things, makes it very easy to learn. Currently I'm working on a shift/rota planning cli app, just to practice several topics at the same time. I have some methods which return the days of current week and coming week as a list just to make it easier/faster to select the desired day to plan. My question would be: is it possible to use these methods dynamically to assign the dates to the enum values(mon-sun) every time the app is run? If so what would be a good way to do that?

[@chexblu]

How come this has so few views and likes. Excellent video mate, keep it up please!

[@kalyankumar8629]

Good toturial Mr.john

[@kaykang8808]

This man makes a boring lesson to a lesson to be a fun and more enjoyable lesson.

[@user-gf2jg4df5w]

Thank you, You are the best.

[@navinbusiness2729]

Thanks john it's more useful

[@limiakejelu]

One thing about John is he picks the right examples that makes one watch and never forget the topic….In this case cereals 😂. Good job man 👍

[@user-zd3iw9ek7r]

Thanks for your sharing

[@DarkenedPossession]

many thanks dude !!

[@Mohamed-uf5jh]

Thanks, very very clear

[@batsybats5591]

Tysm for this video! I had watched another video on enums, but somehow errors were being thrown in my program and I didn't understand the purpose of enums, nor how to use them and now I think I have a clear basic understanding of them. Plus, I really want some cereals now lol

[@dllm3tommy741]

Thanks for the video

[@HimanshuGupta-jx4nk]

I understood it is more like a class which contains its own instance fields as static. for example class test{ static test monday = new test(); static test tuesday = new test();} Thank you very much!!!!!!!

[@mub03]

Awesome Video!

[@KoryGraphic]

This channel is pure trasure

[@Cablur]

Ohh, I really like your sense of humor and how you explain things, even though it was a bit fast. But maybe I'm just tired^^ Anyways, thank you for this great video!

[@Sollace]

1:40 -It's also convention to have one per line, and- (edit: ah you did this later) you don't need the semi-colon if you are not planning on adding any other code to your enum. Edit: 3:09 My understanding is that every time you call Enum#values() it returns a new instance of the array (this is done for security reasons so people can't modify the underlying values array), so as an optimisation you would normally cache this array somewhere if you're going to be using it a lot.

[@pranavnyavanandi9710]

Impressive bro, really liked your second tip.

[@kajimemashiro9686]

3:40: "plus now there´s more room for my beautiful face, here in the corner" I love you man

[@ghettoslick2000]

Awesome Thanks!!!!

[@trantrungnghia9642]

04:48 Sir, your explanation at this point is too good

[@aksharjoshi3384]

What can I say, you are the best!

[@eravil8882]

Hi sir, I've finished the core of java and I am now practicing it daily, and I started to explore more on advanced level and I'm going to start it in java enums. Thank u sir for sharing this. I'm really looking forward for your future videos about java. New Subscriber here!

[@jetspray3]

Where do you go to practice java?

[@pranavnyavanandi9710]

What do you mean practicing it daily? How are you doing that?

[@menaaziz27]

I watch all your videos even though I know about the video .. keep it up john!

[@CodingWithJohn]

Ha, well thank you!

[@jvsnyc]

Me too. I love seeing how he describes it in such a short time without saying anything flat-out wrong which would be so easy to do when trying to make really short videos.

[@AtulRai]

Hey John, thank you for sharing your experience. I have watched couple of videos and became the fan of your explanation. If you don't mind, may I know which theme you are using in your Eclipse IDE? it's looking cool.

[@CodingWithJohn]

It's a plugin called Darkest Dark

[@pranavnyavanandi9710]

@@CodingWithJohn Hello John. Could you make a video covering these things in eclipse like Maven, gradle, ant build, mylyn etc. ? Would be quite informative for beginners. Eclipse tends to overwhelm you with all these terms sometimes.

[@philipepompeu]

Great content

[@Pacvalham]

1:17 IntelliJ tells me that the semicolon is unnecessary, and the enum compiles with or without it; was it required in an earlier version of Java?

[@ayoubmessaoudi5206]

lovely video dude

[@hamidreza8354]

it was great. thanks

[@lolcrafter9524]

W video, probably saves me from a negative grade :)

[@KH-hn3nu]

Amazing break down John, thank you!... Now if only we can get you to reassess these gradings for deliciousness. Captain Crunch is 110/100 LOL!

[@mouadaittalebali3066]

Can not thank you enough!🙏

[@Russianspyonyou]

I learned something!

[@lindascoon4652]

Thank you for your videos. Could you make some videos on a common java frameworks like springboot, gradle, maven etc. I can code in java now but it's like a completely new language when you have to use frameworks.

[@user-ui2hf4vs5f]

Thank you

[@malou5290]

excellent!

[@pranavnyavanandi9710]

final is what makes something constant, and also immutable. If all the fields of a class are made final, then the state of that class is unmodifiable. Which makes the type immutable. At least this is my understanding of it. A handy tip, the data members held by a class/object are what constitute it's "state" and methods make up it's "behavior".

[@jakubsz4602]

fantastic!!!!

[@DereC519]

thank you

[@wasimpatel2618]

love you john.

[@hulagabal]

Thanks

[@HuwJones]

Something missing here is the importance or ordinality. As in most other languages implementing enums or ordinals the items in the enumeration have an ordinal value...the order in which the enumeration's items are defined IS SIGNIFICANT. This can create problems in a project if developers try to re-order the items later on...something which should not be done. This idea of ordinality also has repercussions when mapping to a database. Most databases map enums to a column using the ordinal value by default. Just don't forget the ordinality.

[@chr215]

@Coding with John what is the difference between constants and ENUM, in terms of useage and best code practice? Pls share

[@gregdawe2786]

Holy broken sewer pipe batman, thank you. I've been trying to figure out how to use enums for the past few hours. THANK YOU!!!

[@Metorrite]

4:32 - You thought we would not notice, but we did :) Real question, what design pattern do you use when you have enums that are constant values that need to contain a field that is an object whose internal values need to be changed across instances? For example, if you have different kinds of web input fields in an enum, and you know for certain the type of data type each field returns (String, int, boolean, array, etc) so you want to assign a corresponding validation strategy to each, however, in the strategy maybe you want to validate different values against the result across different input fields of the same type. This is my particular problem however i hope this represents the underlying design question i have!

[@Rockyzach88]

So an enum is like a conglomeration of maps or dictionaries for a specific list of things?