.equals() vs. == in Java - The Real Difference

[@rykageee]

so far I've watched several videos with the same topic but this video only explained well. Thanks man!

[@CodingWithJohn]

Awesome! Very glad I was able to help!

[@phillipmiller4642]

Agreed

[@Dare24]

Oh my god I'm genuinely so thankful I discovered this Channel, John explains stuff like no one else does, you just earned yourself a subscriber mate, thank you for all the efforts.❤

[@magicalhats]

I'm a newbie dev and I finished a bootcamp but your videos topics are all the topics I found confusing during class and always wondered about. TY so much.

[@alexanderpanday]

go away bootcamp people

[@aureliasam2092]

Hi John you did very well in this lesson. I tried to learn .equals and == from a professor but I couldn't understand it and now I got the point from you in 5 minutes.

[@cjm101]

Feeling lucky to have found this channel, I've been self studying on and off for a couple years and I'm pretty sure I should have known these key concepts by now, sincere thanks for these clear and understandable teachings!

[@dotanon]

I got back into Java recently after not using it for like 8 years and have been haphazardly using == for strings and it has been working, presumably because I have been always using strings as state variables in games, and so have been manually typing the strings in my conditions as literals (if (facing == "up")) etc. I saw a comment on another video and I'm glad I found this early enough to refactor everything. haha.

[@praveens9233]

Warning ⚠️ : If you are going to override .equals method,you have to override your hascode method. Otherwise there will be a mess with those objects whenever you hashing

[@Visionist]

Simple and easy to understand. Thank you!

[@theFUNkaarasChannel]

I just found your channel and the world just makes so much more sense now.

[@brtkgromek]

I'm glad I've found this chanel. I've never been more educated by any other escaped convict in my entire life! Keep it up! :)

[@enigma6463]

😂😂

[@iruga7379]

OMFG please keep your content comming...im having a blast learning from you man. Im deeply grateful for all your lessons.

[@streamity24]

Really fascinated at how good you are able to explain. Thanks for the great video!

[@micahrufsvold]

Small piece of feedback: title shoulda been ".equals() and == are not equal" Thanks for the great video!

[@CodingWithJohn]

.equals() != ==

[@micahrufsvold]

@@CodingWithJohn even better!

[@terrypark3690]

wow this goes well with your string pool video. Thanks for making these really comprehensive videos on how java works for the basic things we just usually use without thinking about.

[@danieldanian8070]

This guy is the best as a learner and teacher guide

[@ovey2214]

That was incredibly well explained! Thanks a lot!

[@cananozdemir8913]

I just bought his full Java course. Amazing explanation .

[@Fawstah]

This actually helped me understand why some of the code I was writing was initially breaking. Ty!

[@dhavewala]

John, this was an amazing tutorial! I had a query though; on the objects, do we override the equals() or is it inferred?

[@wiktorstankiewicz3568]

we override it

[@fullfungo]

6:15

[@the_Spartan_117]

By the beard of Zeus! Your contributions to the world of programming are nothing short of epic. Your Java beginner's playlist is truly a stroke of genius, and I speak for many when I say, you are the real MVP!

[@manojpal4415]

Had been scratching my head on a case similar to the example at last, luckily this video explained it. Huge thanks :)

[@olivierbegassat851]

These are beautiful videos man 😁 Every sentence of yours resolves an issue I had and leads to the next question I had. So helpful ! Thanks 🙂

[@tonnytrumpet734]

Sir I have been watching your videos for around 30 hours last 3 days, thank you so much this is great content I am starting to actually understand Java and see how things from different videos relate to each other, sometimes I can guess what you are going into with your train of thoughts, very well put together videos.

[@enfieldli9296]

Wow, noob here, didnt know those details till you explain it, massive thanks John!

[@harlockgaming1476]

Love the Kramer picture in the back, my grandpa has one just like it! Thanks for the amazing videos!

[@WildNature170]

Ah Lord! can't just say how easy you explained it. I have been really confused for several days about this simple .equals in object class and now I know how java processes it. Thank you so much for this video. Subscribed liked and commented. Keep up with your good work!!!!

[@BelayeAssefa1]

this channel always dropping gems. Respect.

[@HR-pz7ts]

Once you learn a thing or two about oops you know exactly what's going on. Thank you for the video

[@jesusromero71]

tus videos tienen un gran valor, muchas gracias por compartir tu conocimiento

[@nilou-s8l]

You explained sth in 8minutes that my French prof couldn’t explain in 2 hours and made me hate Java for no reason . Thank you ❤

[@scottcarter4526]

Might also be worth mentioning that you can use == with enum's as well.

[@DatCrossGuy]

Thanks so much for the video. Genuinely looking forward to the "how to write a good equals method" vid!

[@technicalboy1816]

I wish you were my lecturer at Uni. You have talent man!

[@michael_scarn_]

Thanks John, your tutorials are very helpful. You are a great teacher, hats off!

[@LTZMSYAL]

Thansk's John. Please don't stop your videos they are awesome

[@ujjwals.dadwal8911]

Thanks John, Mucha Gracias from Canada!

[@pawehericht2673]

at 1:46 it is worth saying, that String one = "1"; String oneBis = "1"; when comparing one == oneBis will output true? what has changed and why String one = new String("1) gives us false when ==? The answer is: The String pool I believe

[@akna1987]

These videos are great! But you should have included a video on how to implement the .equals-method and compare-to method to your own class

[@danielcommins1285]

John, where did you get the source and how did you attach the source to the binaries? UPDATE: solution is to point your JRE path to the path with the JDK instead!

[@9891254408]

This is the best i have understoon so far...

[@YusufDemir-gx7he]

It seems I've found my coding channel. Thanks for the video :)

[@MasonJF]

See this is interesting, because I thought with Javas memory management scheme that it uses and forces strings to be immutable would reference the same object in memory, even though the variables are two seperate ones. Eg. I was under the impression that String string1 = "James"; String string2 = "James"; these would both point to the same object in memory because these are the same value, which you would think would cause the == operator to go "Oh hey, this is true!".

[@ruzi173]

This is just the best explanation..wow👏Thank you for all your videos🙏

[@Eduardado]

Very clear. Awesome examples and also my eyes love the dark theme ^^

[@brunomartel4639]

is it too bad if we declare Strings as literal all the time? like String string1= "hello" instead a declaring an object with it? I mean is there a reason to declare an object String?.

[@alyankhan806]

The API contract also states that if you override equals() then you must override the hashcode(), it's an important detail!

[@GenjaOrigins]

You are great. Congrats for channel and being Team Leader. Maybe you could/should make a video talking about what should a junior know. I think i know equals now, exceptions/throw/finally/catch etc, im learning generics and i undertand but i saw a generic method in an interview(company was about HR, and i was asked 4 Design Patterns which i knew but wasnt good enough for company anyway) i had no idea what it was even if i knew generics it was kind of pro code/ultra weird and hard i think it was with lists btw..i also hate leetcode i prefer videos like yours to actually learn java. I would also learn more from you cause you good and you enjoyable i hope you do the same in your job irl. i think i also know most of collections hashmap/set etc

[@rahul64410]

Thanks for the video john seems like refreshing my basics

[@shubhamkatwale6716]

Very well explained Jonh, Thanks again ♥

[@amaralensheriff]

Thanks John, your tutorials are awesome.

[@eshwarnag]

the last part was really good!

[@hba6018]

String Pool, the place where are inline strings are saved, that's why you use new String("hello")

[@علیحمیدی-س2ر]

Thx for your clear presentation Sir

[@lamaspacos]

This channel is very very good.

[@DanielOliveira-ru7mt]

Thanks Johnny Sins

[@lyrixvibz]

Please be polite with your words👍

[@1blkvinci]

@@lyrixvibzhe said thank you

[@lyrixvibz]

@@1blkvincido you know Johnny sins?💀

[@SifatUllah-12]

​@@1blkvinciThat's not the right way to say thank you.

[@JPS13Laptop]

As a python programmer, I definitely see myself getting confused if I were to ever get into Java. Thanks for the explanation :)

[@tazogochitashvili6514]

You shouldn't look too deep into the difference between "is" and "=" in python then lol

[@JPS13Laptop]

@@tazogochitashvili6514 I actually do realise the difference between the two. But I don't use 'is' in my own code tbh. Also it annoys me that Java uses == for object comparison whereas Python uses it for value comparison.

[@palmolive4541]

@@JPS13Laptop Java doesn’t use == for object comparison, that was the whole point of this video

[@JPS13Laptop]

@@palmolive4541 It appears that I still don't fully grasp what an object is. Also it seems that `is` in Python is what `==` does in Java, which is still annoying tbh.

[@tazogochitashvili6514]

@@JPS13Laptop that means that you don't understand either "is" in python or "==" in Java

[@Loghinesko]

The "new" keyword means that when we use it to create an instance of a class, we tell the computer that we want to allocate memory space to put the new object in.... After that, we want to create a new object again in the class, so we need to use the "new" keyword again which again tells the computer that we want to allocate memory for the new object, so it allocates a new memory address to the new object. Right now, we have the 2 objects, but they have different memory addresses because they were instantiated in different memory areas. When we compare objects, we are actually comparing the memory addresses of variables (objects). In fact, these variables are pointers to objects.

[@SecretFols]

The underline is even if the primitive or non primitive or user defined type java will check for the memory location and not the values.. (if the values are same then uses same memory location).

[@colonelh.s.l.3834]

This is awesome! Can you do a video on priority queues and comparators, and how they come together?

[@Zalaniar]

I was gonna say something about the weird use of a string constructor at the beginning, but it's a good thing I decided to wait, lol. IIRC, the javadoc even yells at people about wanting to use == for strings which I find hilarious.

[@Zalaniar]

In case anyone is worried about java doubling up on references to strings like that causing weird bugs, don't worry... because strings are immutable, if you try to change one, java will just make a new String object and point the variable to that one instead, leaving the first untouched.

[@wayneinteressierts9973]

Great video as always. Thank you for your dedication!

[@Amy-zb4iq]

What’s the codes for .equals() in class Dog?

[@surkesden]

Good explanation! What about enum comparation? What should I use?

[@iyhan1987]

7:03 I guess almost everyone(who studies Java seriously) knows about the pool of strings cause it is a pretty common topic. I bet if you want really “to impress some nerds” you should show them some “pool of Integer” style tricks :)

[@ernestoc.d.1868]

I would like to see the "How to implement a good .equals() method".

[@inx1819]

Step 1. Use Lombok

[@wannabeserpento99]

Eclipse can generate one for you and I don't know why he doesn't mention it

[@Pacvalham]

1. check for identity (if(this == obj) return true;) 2. check for type (if(!(obj instanceof _ThisClass_ )) return false;) 3.a cast the object ( _ThisClass_ castObj = ( _ThisClass_ ) obj;) 3.b compare each field (return this.a == _[or .equals()]_ castObj.a && this.b == _[or .equals()]_ castObj.b && ...;)

[@shama-_-]

thanks a lot you help me to understand the concepts

[@bhagyakavijan9014]

Thank you so much.. Your explanation is very clear...!!!

[@saranr4878]

Just the greatest explanation !

[@simonjunior184]

Amazing explanation. My Uni java lecturer even didn't taught us this important concept. Keep up the great job!

[@thalathotitharunprabhakar3390]

Easy to understand. Thank you.

[@konstantinzakharov5643]

I love this guy! I am hitting the Like button!

[@robertod893]

Excellent video as always!

[@medkamy2393]

Best tuto ever

[@provokator-provocateur7603]

Best intro ever

[@radhemohannaamhai]

Man they rejected me yesterday based on this question

[@galirams9653]

John, please clarify this for me, in text, how would you declare and compare 2 string objects for equality?

[@GaryChike]

This is a gotcha for those coming from C#. Great explanation John!

[@potatofypotatofy7772]

Thank you John

[@InfoBuzz1130]

Hey pls make video on comparable comparator interface in java

[@Sui-Zan]

Orange is the new black, John. You look great! Thank you very much for the videos. You make java seem so simple to me.

[@MarioVillamizar]

Cristal clear!

[@InfiniteWisdom1.0]

Thank you so much, your videos are pretty helpful 😊

[@anubhavsingh2916]

To the point explanation

[@technoultimategaming2999]

And it's very intuitive why == cannot always work. If you have a Room class and you ask java to check if a room is equals to another room... Well... It doesn't know what to check, should it check dimensions of the room, should it check furniture inside? While with numbers it's very obvious what people mean when one number equals another, but for objects like rooms it's really up to the programer to define what "equals" actually means

[@Coccoutube]

Thanks John!

[@laurentlefevre9233]

Nice job John !

[@HackInTheBoxx]

Can you do a video sometime on instanceof, thank you.

[@kilian9758]

Your tutorials are awesome! Though I wonder if this affects switch cases too. Can I always use switch cases or do I need to be cautious just like with the == operator?

[@bhukyasharath2015]

Superb sir❤

[@barneylaurance1865]

I would call `==` the identity operator. It tells us if the two things are identical, not just if they are equal. In the real world two mass produced objects, like two coffee cups might be equal in every aspect you can measure, but they are not identical because they are two distinct objects.

[@Programming-for-all-u2l]

Excellent teacher

[@cestmoi5248]

wow, very well explained. Thank you

[@jeffreydwightryanriley8308]

Is variable type even necessary? That’s why I like php. The types can be manipulated in the database and queries are objects. It allows synthetic interaction essentially in that the programmer ultimately codes states versus implicit phases of data. Such as arrays of arrays.

[@bextrekks8354]

lmao, that head pop up at the beginning cracks me up!

[@altamashsabri8142]

Amazing explanation, thanks alot

[@findlestick]

This is a very useful video.

[@cryptoInNutshellR]

Thanks. Useful, however you still did not cover how to compare 2 objects on the Dog example staring from 05:08

[@HIMANSHURAGHAV-km8rr]

Thanks john 😄

[@ayanokoji8456]

Wow thanks man it is so well explain !