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!

[@Reshmashon]

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

[@rajatagrawal7016]

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

[@blinkwit1427]

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

[@ManishKumar-qx1kh]

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

[@rahulrsavant]

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

[@ericaugusto5640]

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

[@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 :)

[@sourabhgurjar1324]

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

[@karandedhiya9575]

Very simple and to the point explanation with beautiful PPT

[@hassanmahammad1135]

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

[@priyeshmalviya6483]

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

[@sapnahegde5491]

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

[@ankit.wasankar]

thank you, sure uploading more soon.

[@naveenprakash3640]

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

[@aniruddhachunne3011]

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

[@pavankalyanmodugu994]

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

[@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

[@linhpksw]

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

[@aniketjadhav3503]

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

[@tanishktripathi217]

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

[@nikhilbhangale5894]

simply great with animation ......

[@prashantranjan4859]

Excellent.. wonderful explanation.. thanks a ton.

[@karthikr8798]

You are a LEGEND sir. Thanks for the video.

[@iwn77620]

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

[@bharatiyaashish]

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

[@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.

[@anandlshinde]

Good Content / presentation and explaination. Keep it up

[@jatinsharma3792]

Ahhhh shukariya bhai !!!

[@savaliyaparth468]

Great explanation 👍

[@NeverQuitOk]

KINDLY UPLOAD SOME MORE VIDEOS RELATED TO JAVA INTERVIEW QUESTIONS

[@mahmoudramadan9193]

Great explanation . thank you ♥

[@parleneha25]

Awsome explanation.. Thank you🙏

[@knowledgeispower115]

Great explanation

[@marvellouschandan]

Awesome explanation bro 😃

[@rakibullahsarkar1870]

Thank you for clearing my confusion

[@MHK958]

Awsome

[@ankit.wasankar]

thank you

[@sandeep_khangar]

Awesome video's and pictorial representation ❤️❤️

[@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){...}

[@NKG_Creations]

Excellent Sir, Thanks alot

[@naveenvigneshwar5190]

Thanks a lot 🙏 💓

[@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.

[@priyamore8582]

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

[@thevagabond85yt]

9:12 this chart is OP

[@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.

[@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.

[@SinghRahul-]

why dont u upload more videos..

[@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.

[@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 ==

[@GauravVermasadh_raj]

how get operation will work here ?

[@sushiljoshi2326]

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

[@AbhishekKumar-pk3zp]

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

[@smsms8522]

Excellent Video

[@sanjayranga2683]

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

[@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

[@sreedharreddy472]

well explained sir. It is very clear.

[@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

[@dnyaneshtathode5511]

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

[@jeebanpradhan8050]

Bro logical program java please

[@davidbilla2361]

Why you stopped posting videos?

[@koenasadhu8068]

Wonderful explanation!!

[@sirojiddinsaidov3657]

Very good video. Super

[@prasadkondhalkar6499]

Most simplified explanation watched till now. Great work.