#24 - How HashSet works Internally? Do you know HashSet uses HashMap Internally? (Java Collection)

In this video, I have explained How HashSet works Internally? Do you know HashSet uses HashMap Internally?
This is a quite famous interview question, and most of the people are not sure of this concept.
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[@sumitkumar-kg1xb]

Supper point-to-point explanation.. Great thanks for making such a good video.

[@chemudupatikarthik8]

Wonderful explanation. Thank you so much!

[@manojvg2646]

wha what an explanation , exactly what I want to learn

[@nadaquever5161]

killer interview question ;v

[@Hadabe-nai]

Great piece of information. Thank you 😀

[@azeemmirza9855]

Your explanation is on point bro...thanks

[@hiteshdarji9925]

Naveen bhai In debug mode no table showing.Baki aapka video kamal ka he . Maja aa gaya.

[@adaickalam]

well explained... thank you.

[@madansingh-rw9ve]

your content awesome, thank you for providing great content

[@vedantupadhyay5927]

Can you provide link which you open at end of video where souce code of hashSet there. Please

[@DurgaShiva7574]

what a video....what a quality content , what a learning...THANKS A TON SIR..

[@vivekpathak3643]

This video really helped, thankyou!

[@tannubajpai4782]

best explanation by u Sir

[@linexustjk6061]

Thanks a lot... This is helping a lot

[@bhushan7546]

very nice and clear explanation 😊

[@jainlove]

Amazing series ❤️

[@harshachakraborty3505]

This is very useful 👍

[@niteshpandey8207]

great explanation thank you.

[@jajatisahoo3831]

Awesome

[@priyanshusinha7056]

Thanks bro ❤️❤️❤️❤️

[@rakhikhatri8878]

As in your video we can see HashMap while debugging the code but same way I am doing but unable to see HashMap after adding string value. please tell me where I am doing mistake.

[@saxenahimanshu6584]

Nice Info but I unable to open that info while hover toggle point and display map then table , etc, the version I am using on windows won't provide that many details. Please provide some solution for this. Thanks

[@AjayKumar-ju6sl]

Sir , How constructor with Collections works ??

[@ravikumaryerrolla8974]

Very well explained Naveen, however what I observed here, if HashSet not follow insertion order then why is it implementing SortedSet interface, I believe HashSet extends AbstractSet and implements Set interface. Please Advise if am wrong.

[@martingalvan1446]

HashSet do not implement SortedSet interface

[@jananiramesh6978]

I have a doubt, does present stores the address of null value? So it points to null ?

[@sriramkukkadapu]

Nice explanation but why it is implemented this way ? Is there any advantage of doing it this way ? And what is the use of the PRESENT object ? @Naveen

[@B-Billy]

1. Reusability of code. 2. PRESENT is used because Map required a value if you want to store something into it. So PRESENT fulfilled that requirement.

[@pratapjavasingh3239]

As u know set will not Store the duplicate value but did u ever though how exactly set will not Store the value that reason is set algorithm is written in such way that check if u are add the elements throughout the add method then internally ur source code interpret according to ur jdk inside classloader and it will call the specific for set library and then set algo library check in same way if u are not comfortable "Present" then u can take any variable and it is same work as a Boolean to check data is already present or not and u want see ur source code if u decompile there Present is available and if u want create ur own custom set then followed the same approach whatever for writen is set algorithm

[@muzamils.l.236]

thanks naveen didn't knew until i watch this👍

[@shubhampandey8765]

HashSet doesn't allow duplicates, isn't "over here" is repeated "over here" ? :) Jokes apart, nice explanation though.

[@VaniDatta]

When I mouse over I can see Hash Code but can not see Java.Lang.object@address. Why? Thanks much in advance 🙏

[@kalpanan7164]

For me also same thing happened

[@kumarjadhav6106]

public class Emp{ int id; String name; //Constructor overrided with args public static void main(String[] args){ Emp e1=new Emp(1,"A"); Emp e2=new Emp(1,"A"); Emp e3=new Emp(1,"A"); Emp e4=new Emp(1,"A"); Set set= new HashSet(); set.add(e1); set.add(e1); set.add(e2); set.add(e3); set.add(e4); System.out.println(set); } } Please explain this scenarios When hashcode and equals both overrided or any one of them is overrided or none of them are overrided

[@glennmaxi7542]

is hash collision happens in hashset?

[@KunalSharma-ki8rd]

Yes, As It uses the same implementation of HashMap So If we continue on this then we can goto the Bucket Size, Collision Handling Balanced Binary Tree. Everything is same!

[@kumarjadhav6106]

What happens when we add duplicate objects.?

[@B-Billy]

If the object already exists, it does not store the object and return false.

[@surajgoenka]

You didn't tell what if we try to add duplicate element

[@crimsonx_]

When u add duplicate hashset simply ignore.. ignore in a sense that it is overwriting the previous value with new one. if i add "abc" again i add "abc" both are same value previous abc will be overwritten.

[@crimsonx_]

see his hashmap implementation video.

[@himanshumamodiya1827]

why they have implemented in this way ?

[@dharanyuvi6951]

I think the developers might have thought to implement a list like datastructure with hashing in it. This is just my assumption.