02. Equals and HashCode Contract & Different Variations

[@KiraTeiubesc]

I have watched like 5 videos on this subject, but it still wasn´t that clear. But you explained everything so clearly and easily that now I get it! Thank you very much 🙏 !

[@ankit.wasankar]

Thanks a lot

[@rakibullahsarkar1870]

Exactly!

[@mangesh26]

You made my day, I watched dozens of videos and gone through many websites, blogs but not able to get clear understanding. But the way you explained it, it blow my mind. Good Job, keep posting videos

[@AbhishekKumar-pk3zp]

For me, this video has the best explanation of hashcode and equals method contract.👍 Worthy to subscribe.

[@blinkwit1427]

You have a gift for explain clearly concepts. You should continue :)

[@sushiljoshi2326]

He explained very well with his nicely made presentation ! Thanks for this video. Others make this concept complex, he made it simple .

[@prasadkondhalkar6499]

Most simplified explanation watched till now. Great work.

[@rajatagrawal7016]

You explained it to me in a very easy manner I have watched many videos but your videos cleared my concepts

[@ericaugusto5640]

Amazing teaching skills, thank you for this, now i finally understand this concepts.

[@Max25598]

Very good explained!

[@sourabhgurjar1324]

presentation is really good and simple to understand the concept very well.

[@karandedhiya9575]

Very simple and to the point explanation with beautiful PPT

[@dnyaneshtathode5511]

That's a really good explanation. Clear and concise. Keep it up.

[@smsms8522]

Excellent Video

[@rahulrsavant]

Got 10 out of 10 for Explanation, make lots of different videos, using same style, Thanks 🙏

[@linhpksw]

Very clear and through. Thank you so much. Keep doing more!

[@shivaraju8405]

Seriously a wonderful explanation. watched so many videos but after watching this video there is no requirement of watching other videos. Great Work Man, keep it up . tqsm

[@aniruddhachunne3011]

Thank you so much sir... you are saver .....i spend whole day to understand this concept..

[@Reshmashon]

Really appreciate your effort to make topics so simple and make sure that we understand it.

[@ankit.wasankar]

thanks a lot. your feedback means a lot.

[@sanjayranga2683]

The best explanation ever .. i think my interviewer saw your video :P

[@prashantranjan4859]

Excellent.. wonderful explanation.. thanks a ton.

[@ManishKumar-qx1kh]

we need to make this channel popular by any means. The videos are exceptionally good. Thanks for the hard work brother.

[@karthikr8798]

You are a LEGEND sir. Thanks for the video.

[@koenasadhu8068]

Wonderful explanation!!

[@iwn77620]

Thank you for the effort of visualising it so good. Very clear presentation!

[@sapnahegde5491]

Thanks. Please upload more videos. You make concepts so clear by your explanation.

[@ankit.wasankar]

thank you, sure uploading more soon.

[@tunghoang9373]

Thanks from a user from Viet Nam Your explanation was so easy to understand although it's hard to understand your english as much :)

[@tanishktripathi217]

You earned a subscriber, bro! great explanation, keep doing this!

[@shraddhawagh9480]

Awesome explanation Sir..... when I watched your videos and went for interviews and explained same which you explained , interviewer really impressed with this ... you deserve million of subscribers Sir... one request can you please make video playlist on one real time project so that it would be beneficial for us ... By using latest technologies like SpringBoot , Microservices, latest angular for frontend Database as oracle DB

[@pavankalyanmodugu994]

The way how u explained awesome great sir make more videos in the same style of explanation &presentation also

[@naveenprakash3640]

I usually don't comment....but this is really amazing

[@savaliyaparth468]

Great explanation 👍

[@hassanmahammad1135]

Wanted to complete java series, hope u get million subscribers and likes

[@aniketjadhav3503]

this same interview question is asked to me in datamaticas but could not able to answer but now I can!!

[@sirojiddinsaidov3657]

Very good video. Super

[@knowledgeispower115]

Great explanation

[@rakibullahsarkar1870]

Thank you for clearing my confusion

[@anandlshinde]

Good Content / presentation and explaination. Keep it up

[@nikhilbhangale5894]

simply great with animation ......

[@parleneha25]

Awsome explanation.. Thank you🙏

[@sreedharreddy472]

well explained sir. It is very clear.

[@supriyashrivastava4535]

Explanation is very precise,clean & well documented. Thank you so much sir. Please make a video on java 8 features with implementation.

[@ankit.wasankar]

Thanks and sure.

[@NeverQuitOk]

KINDLY UPLOAD SOME MORE VIDEOS RELATED TO JAVA INTERVIEW QUESTIONS

[@marvellouschandan]

Awesome explanation bro 😃

[@jatinsharma3792]

Ahhhh shukariya bhai !!!

[@priyeshmalviya6483]

Thanks bro !! You explained very well about this concept in a video

[@ankit.wasankar]

Glad it was helpful!

[@mahmoudramadan9193]

Great explanation . thank you ♥

[@NKG_Creations]

Excellent Sir, Thanks alot

[@sandeep-rai07]

Awesome video's and pictorial representation ❤️❤️

[@bharatiyaashish]

The way you explain is wonderful✨ Please make more vdos...🙏👌👏🌻🇮🇳😊🙇

[@PriyankaC-wo8ns]

sir, "==" checks if both the objects are pointing to same memory location or not and .equals() method compares the values.

[@ankit.wasankar]

yes, that is correct, "==" checks if both the references are pointing to same object or not. If equals() method is not overriden, it will use inherited Object.equals() method, which is same as "==" check. If equals() method is override, then it will be behave as per the code in equals() method, and usually equals method is override in such a way that it compares the content/values of object.

[@naveenvigneshwar5190]

Thanks a lot 🙏 💓

[@shubhamshinde3448]

on length 10.19: The image incorrectly shows duplicate s1 nodes. The correct behavior of a HashMap is to update the existing value for s1 instead of adding a new node in the bucket if the equals() method considers the keys equal.

[@atulverma.515]

Thanks, Ankit. this is quite a comprehensive video on this topic. A couple of questions came after using the same example. 1. I have created three objects of the student class, st1, st2, st3. with the same values of roll num and name. put s1, s2, s3, and again s1 in the map. but the size of the map is showing as 3 and not 4. however equals always returning false. 2. how come get() method is working, as equals() method in student class is returning false?

[@ankit.wasankar]

for first question, from java 8 code, i see java people has added an extra check for object equality viz. if (ref1==ref2 || ref1.equals(ref2) ).. so due to this or condition when same object is added it overwrites.. ( thanks for noticing this. will need to update the same in video) for second question, it's really good question and has been answered on stackoverflow. Please check here. stackoverflow.com/questions/13521184/equals-returns-false-yet-object-is-found-in-map/13521238

[@atulverma.515]

@@ankit.wasankar Thank you Ankit for sparing time to clear my doubt. Cheers.

[@SinghRahul-]

why dont u upload more videos..

[@MHK958]

Awsome

[@ankit.wasankar]

thank you

[@RishiChopra141]

In Student Class you are not overrriding equals but you are overloading it. To Override equals you have to have same method signature first which is public boolean equals(Object object){...}

[@pif5023]

I would be careful with the first example, it is confusing. The JVM will say o1.equals(o2) not strictly because they point to the same object in memory but because being the same object their fields will be the same by value. The operator to check for identity (exact same object) is == in Java.

[@karamjitsinghsehdev3451]

But equals method compares the content and not the memory location. 😢

[@ankit.wasankar]

Yes, the equals() method should always compare the contents. But if you don't override the equals() method in your own class, then it takes the default implementation of the equals() method, and that implementation doesn't compare content instead it compares the memory internally.

[@davidbilla2361]

Why you stopped posting videos?

[@Kundapuratiger]

what happens if we return true as bool .is it print the last one as output

[@thevagabond85yt]

9:12 this chart is OP

[@vijayaakkireddy5952]

equals() evaluates to the comparison of values in the objects..If so o1.equlas(o3) should return true right.since == is used for memory reference comparision

[@ankit.wasankar]

the default implementation of equals is same as ==

[@priyamore8582]

It's just like string. N. When we create with new then instance is thre n alm

[@GauravVermasadh_raj]

how get operation will work here ?

[@jeebanpradhan8050]

Bro logical program java please