hashcode() in java || The IMPACT of hashcode and equals || java object class || Part 1
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- เผยแพร่เมื่อ 2 มี.ค. 2019
- hashcode() in java, overriding hashcode java, how hashcode is calculated in Java,object class in java, what is hashcode in java, hashcode and equals method in java
hashcode java,hashcode and equals in java,object equals method java,important topics in java,hashcode and equals contract in java,java object class methods
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The 'hashcode and equals contract in java’ is one of the most favorite questions in the java interview room. This question is also very important to test candidates
collection fundamental as the hash-based collections like HashSet , hashtable, hashmap etc uses hashcode() and equals() to get its task done. So let’s understand
the hashcode() and equals() from object class(java.lang.object) step by step.
This is part 1 of the ‘hashcode and equals series’ and we will only be talking about hashcode in this video and in the next video we will move to the equals method in java.
This tutorial based on the focus on the following topics.
1 hashcode() description
2 Understanding native åmethod in java
3 Understanding the hashcode calculation
4 Overriding hashcode method of Object class
5 Creating custom hashcode method
6 Key points of hashcode()
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Of all my years of viewing TH-cam lectures/tutorials/explanations you are by far the most concise, and carefully articulate tutor! thank you
Thank you, Sam.😊
Well-done 🎉
Awesome explain 👍
Very good and deep explenation
Very good explanations
Very good explanation
Super:) More n more expectation from you:)
Very Nice Explanation!
Good explanation
Simply Great!!!!!!!
Very good explanation. Thanks Abhilash.
Pls create more videos like this ,you are the best on TH-cam for explaining any topic ,pls upload a interview series for experience in Java
god bless you brother for this amazing explanataion
Simply no words to say than saying Thank You, So Thank you so much Abhilash..Great job keep it up.
nicely explained pls quick upload part 2 of this video
Thank you, you would be a great teacher or programming on IT faculty, very calm, focused and straight to the point. The step by step approach is really effective here. Best wishes.
Excellent and superb always
wow so well explained! Thank you.
truly such a great explanation ...like i am in primary school and the teacher is explaining me
This channel it s in another level .We should pay one .You show how things work internally . Nobody do that. Millon thanks
I have been watching a couple of your videos. your knowledge is seriously so deep in coding and you explain truly so basic. I truly thankful for all great knowledge that you share with us and now I am following to watch all your video.
stay bless.
Great work ! Great teaching ! You put a really great work in this lesson ! If possible make more basic practical examples with trusted libraries. Thank you.
i think your body is filled with java awesome great keep doing such videos love your teaching sir superb
Hey, nice lesson..!thank you..
Thank you sooooo much... The explanation is very clear and thorough
this video helped me A LOT! thank you so much for this tutorial I really appreciate your energy
WOW MAN! Simply superb...crystal clear
Nice way to make concept clear.... Thnx
Hey, great lesson! Can you do Serialization sometime?
I just want to Say Thank You So much Bro
I love to watch your video and clear my basic fundamental in core java.
Don't know why this guy has so less subscribers. Definitely he needs more subscribers
Well said
super knowledge n best explanation.. thank you
Man o Man ur teaching method is way too good.. Ma Sha Allah nazar na lag jaye kisi ki. Hope ur channel grow fast nd it will.. Keep up the good work sir.
Great !!!!!!
great editing work
Eagerly waiting for your 3 rd video of the series. Pls complete that. I didn t find any tutorials which gave a satifactory explanation abt the contract bw hascode and equals they are just showing some examples and telling that it is necessary. Pls post a detailed video.
Thank you bro it was so good tutorial for developers who has not got solid knowledge about hashcode. Respect
Thanks for teaching java this way, the information you're providing is very helpful! thanks!
Good lecture. I was sloppy in one of my previous comments, but I realize we should write hashCode() consistently with the Capital C. Certainly in a tutorial, but really any place. We are used to the IDE fixing things for us, but it is better to remember it correctly.
Excellent bhayya , good one Thanks a Lot
Very helpful session Thanks 🙏
Worth every minute ......good amount of hardwork ...thanks
Thank you..Glad that it helped 🙂
great explanation. You explain the concept in depth and repeat the concepts again for better understanding just like I do while teaching. Great job. keep it up.
@Abhilash, How do I condition the hasCode to generate only 6 numbers per object created?
Bro pls make a set of video of spring aop module.. I saw your whole series of core module and that really attract me the goods of spring framework.. Pls do it for me and rest of the student
Excellent video thanks
Thank you for your crystal clear explanation.
This is high level explanation ,,,, just no word's to say... This type of professionals required for achieving anything..... You are doing great work... Thank you so much abhilash.... We are expecting more concepts like this from you and help the people like us.... 🙏🙏🙏
Together Moving Forward Team
Very clearer explanation. Keep it up. God bless you
Bro, your explanation is very nice. Is it possible to share which books u are following to get this kind of knowledge?
Clear explanation.thnx
Superb incredible explanation bro.You clear my all doubt
Very well explained Thanks a lot.
Thanks a ton Abhilash!!
I think : At 32:11 the hash code method returns same number because u created a string literal, a string object is created by using a new keyword.
this is awesome bro....keep it up....your videos are quite good but you are underrated by youtube....keep up the good work...you are helping million minds like us...god bless you
Excellent bro!!!..cheerss
Very good explanation.
nicely explained bro, plz upload spring-boot videos
HOW DO YOU KNOW THE HASHCODE FUNC DOES NOT RETURN THE MEMORY ADDRESS OF THE OBJECT IN HEAP!
IS THERE A WAY OF KNOWING THE MEMORY ADDRESS OF OBJECTS IN JAVA
nice explanation
Great explaination..Can you please make a video on executor framework.
nice way of explaining...
nice video!
Very detailed and simple explanation, really loved your video :)
For selenium automation Engineer up to what level Java is required .
✌✌
Great explanation, really helpful. Please make some java real time projects videos
Thank you👍
Awesome explanations.... waiting for part 2.... happy coding
Good video. Thought he was talking about eunuchs for a second though.
Very very good explanation.
Thanks, Soumya !
To make this less confusing, the Strings "FB" and "Ea" were meticulously and purposely chosen, as virtually any other combination of two letters in either String would be different than "2236".
That confused me until I messed around with it myself.
God bless you
Object identity ensures by equals then why hasch code is required and what is the significance of it?
You teach really well
wow, the first part was supposed to be boring? it was very interesting! great video
Dear Selenium Express, why is the need to override Hashcode as anyway we are getting hashcode from the default object class ??
Do u have plan for selenium WebDriver ?
Hi, what's the reason for hashcode same for FB, Ea objs, pls share it, yesterday I faced
thank you so much
I think all string literal point to same heap memory ,while string object points to do different object in heap memory, please let me know if it is otherwise.
Thanks a ton :)
super
When will i expect next video of this tutorial Abhilash
gigachad!
So in this case, str.equals(str2) will be true, right.. for the values str=FB and str= Ea
If the native Object class implementation of hashcode method utilizes address of the object (which is unique) in the calculation of hashcode, then how is it possible that two different objects (even though they have same contents inside them) can have same hash code? A custom implementation of hash code for Employee class which has integer id as an instance filed might utilize this id to calculate hashcode in which case, different employee objects(E1 and E2) with same id will return same hash code. But if you're relying on object's class hashcode method implementation, how will you get same hash code, when we know E1 and E2 point to two different objects.
Hey Abilash please upload video on comparator and comparable interface please
yes plz do it
bro please upload spring mvc and spring boot example
Tq
But, as you said, the hashcode is uniquely calculated for an object. Then given the same hashcode, the corresponding objects must be equal, isn't it? Else the implementation of hashcode is incorrect. Can you explain? Do you suggest we must always implement our hashcode for an object where hashing is needed?
Hi..abilash bro...we are eagerly waiting for full spring boot tutorial by selenium express...when it's possible ?
this means equals method is used for content comparison??
What if 2 objects have the same contents, but their hash codes are different? Are the 2 objects equal or different?
can't we override the hashcode() & equals() method so every time we will get a unique number each time?
I feel like this tutorial could be explained in 10 minutes max. Great Video, but not that concise.
The traffic though.