Java - Compare the Objects using equals() & hashCode()

Рет қаралды 43,980

Күн бұрын

Source Code:thecodingsimplified.com/compa...
- By default equals method only compare the reference object
- To compare based on Object value, override the equals & hashcode method
- First compare by hashcode(), if hashCode of both Objects are different, then objects are not equal
- but if hashcode of both Objects are same, then we check the equals method
- hashcode is used to quickly checl the equality
- Now whenever you're adding Object in Set or Map, then also you need to overide the equals & hashcode
- Because, Set & Map check the equality & if Object are equal it won't add again so you need to add equality
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Пікірлер: 77

@samirpanchal9266 2 жыл бұрын

Great explanation, I was scratching my head from last 2 hours and your 16 min video made it clear easier than books and Udemy courses. Keep it up, man.

@CodingSimplified 2 жыл бұрын

Thanks Samir for your nice feedback. Keep Watching our other videos as well.

@SHAnkarKumar-go4xk Жыл бұрын

To override the hashcode is that the only way or do we have any other way to check the hashcode values of two objects?

@larbiaitdjebara1683 2 жыл бұрын

Thank you so much for the tutorial it was really well explained, although i wish you explained a little bit more the casting part " Employee emp = (Employee) obj ", but other than that great video !

@nurbekhalikulov8867 Жыл бұрын

Thank you very much dude. Your explanation is so neat and objective. Kudos on you

@CodingSimplified Жыл бұрын

Glad it was helpful! Keep Watching.

@sujithkumar3925 3 жыл бұрын

thankyou you cleared all my doubts in this concept, thanks a lot :))

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@iamsh4r106 2 жыл бұрын

Great video, really helped me grasp the concepts. I have question, is it a good idea to put the hashCode equality check inside of the equals method?

@CodingSimplified 2 жыл бұрын

Either is fine. We can have another function as well for it to make it more modular.

@naveenprasanth1233 Жыл бұрын

== compares reference and .equals compares the values is what I learnt

@techieadi4377 Жыл бұрын

sir, you stop making videos ?? your video is very good for fresher as well as experienced people especially those who want to learn Dynamic programming what great content you have sir. And the very important thing which I want to thank you that you have created these videos 2 years before only when no one was giving this imp concept for free and you gave. Thank you sir

@CodingSimplified Жыл бұрын

Thanks Adi for your such feedback. It really gives nice feeling to hear such feedback. Due to my workload, I was not getting much time to create videos. But now, I'm thinking to start creating videos again. All your words have provided much motivation to me to start again. Stay tuned. You'll see more videos now.

@techieadi4377 Жыл бұрын

@@CodingSimplified yes sir please I am eagerly waiting for the videos please make the videos on programming sir on "collection" because it is the heart of java and no one gives much clarity on that so please make some videos on the "collection" side and their programs.

@shubhamgagre8789 Жыл бұрын

Nice explanation To the point Exactly what I was looking for

@abirkec 3 жыл бұрын

Very nice explanation actually. 16 mins worth it. Thank you lot

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@markthomas9641 2 жыл бұрын

Great video. Alternatively if you are comparing JSON then DeltaJSON is a really useful set of tools for compare, merge and graft.

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback.

@academico4891 2 жыл бұрын

thanks a lot dude it's just what I was looking for :)

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@e.ch.vidyasagarkorada8937 4 жыл бұрын

Thank you for knowledge Very useful I have one dout What happens if we override only equals method not overriding hash code In case map is it will consider Both objects are equal or not Should we override both methods or is it mandatory to check for equality Please reply Thanks advance

@CodingSimplified 4 жыл бұрын

Hash code is used to improve searching. As we explained in video, even if you've only equals, it'll work, but if you override Hashcode, it'll do 1st check & if Hashcode is equal then only check for equals. Let me know if you further doubts.

@FTLC Жыл бұрын

thanks for such a great explanation

@brandyplays6134 4 жыл бұрын

beautifully explained..thank you so much:)

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@namrathas5804 Жыл бұрын

Very well explained. spot on explanation. Thank you so much for this video

@CodingSimplified Жыл бұрын

Thanks for your nice feedback. Keep Watching :)

@annapureddyravi4054 2 жыл бұрын

Very nice explanation..thanks sir

@shynimol4454 2 жыл бұрын

great explanation..Simple and not at all confusing

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@pawankapure7593 3 жыл бұрын

Thank you.. Nicely Explained

@CodingSimplified 3 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@harikagoud7652 2 жыл бұрын

do you mean equals() and hashcode() exists only for set and map but not for list?

@abhinavminocha1894 4 жыл бұрын

Sir please upload more videos on Strings, Graphs and Dynamic Programming. Thanks so much in advance.

@CodingSimplified 4 жыл бұрын

Sure, will upload on these topics.

@somyarathee 3 жыл бұрын

SUPEERR!! Thank u soo much sir!!!

@CodingSimplified 3 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@atharvakale5842 2 жыл бұрын

Great Explanation man

@saimamalim9861 Жыл бұрын

Great explanation

@13success66 2 жыл бұрын

Very nice explanation

@adityalodhi4023 Жыл бұрын

God level explanation.....but after watching it I have one doubt if e1 and e2 have same content and we are overriding only equals method then it will never calls equals method bcoz their hashcode is different according to the object class hashcode method.then it will add e1 and e2 in hashset even though their content is same......plz reply

@adityalodhi4023 Жыл бұрын

2nd doubt- I m overriding hashcode method e1 and e2 has same hashcode and i m not overriding equals then it should simply discard the e2 object bcoz their hashcode is same but it is adding in hashset........now if hashcode is same for e1 and e2 then it is calling object class equals method or not????? For content checking plz reply

@ajaysingh9570 2 жыл бұрын

such a wonderful explanation ..

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback.

@pnworks9186 Жыл бұрын

Very helpful Sir

@CodeMode9313 Жыл бұрын

bhai well explained ...keep it up

@ANJALISingh-cq6nt Жыл бұрын

great explanation sir Thank u so much sir

@CodingSimplified Жыл бұрын

Thanks Anjali for your nice feedback.

@SACHIN-gd6zy 3 жыл бұрын

Very good explanantion.

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@arlingamnandini1327 3 жыл бұрын

Thank u so much....

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@karthickn956 Жыл бұрын

Thanks dude

@meenaxichaudhary1721 3 жыл бұрын

awesome explaination

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@shubhamdeshmukh1866 2 жыл бұрын

Broooo u saved me 🙌🙌🙌🙌🙌🙌

@sreenivaskp4181 3 жыл бұрын

Excellent Video 👌👌👏👏

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@ajitbombe5168 3 жыл бұрын

Thanks :)

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@sagardarade 3 жыл бұрын

Crystal clear

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@muzammilkhan382 Жыл бұрын

thankyou sir

@kiranking5717 3 жыл бұрын

Excellent

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@adityapatil3884 3 жыл бұрын

Best explanation

@CodingSimplified 3 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@xahmiyuto7844 2 жыл бұрын

@kvnagendra5354 Жыл бұрын

❤❤❤

@user-kh6rp6yx1j Ай бұрын

Hey man.

@ramesh_hegde Жыл бұрын

return this.name.length() % 10 will return 7 for both words with length 7 and 17 right?

@PomogB Жыл бұрын

Indian English is wonderful

@umeshjoshi8047 2 жыл бұрын

Great explanation

@CodingSimplified 2 жыл бұрын

Thanks for your nice feedback. Keep Watching.

@shraddhadethe7644 3 жыл бұрын

Best explanation

@CodingSimplified 3 жыл бұрын

Thanks for your nice feedback. Keep Watching.