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HashSet (Collection Framework)
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- čas přidán 7. 03. 2014
- This Video explains Core Java - Collection Framework | HashSet. Training Tutorial delivered by our Trainer Durga Sir.
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![TreeSet Details part 1 [Collection Framework]](http://i.ytimg.com/vi/4uvdetsRq90/mqdefault.jpg)
This guy never disappoints.
Durga Sir, one thing i will definitely comment, i have seen most of your collection videos and the way you have explained the concepts with example on such tough topics collections made me very easy to understand. The way you explained conceptually every topics is amazing. Thank you so much sir. If possible please put one video on Hashcode() and equal method () importance and differences. I have seen others video on this topic but not at all clear.
Hi Sir, HashSet will be heterogeneous only when we don't provide Generic with it. In that case ArrayList, LinkedList all can be heterogeneous if we don't use Generic. And using collection without generic in a project will lead to this warning "Type safety: The method add(Object) belongs to the raw type HashSet. References to generic type HashSet should be parameterized".
Sir thank you so much I am new to java ur explanations are very easy to understand. Even I saw lot of concepts but not understandable
JAVA King DurgaSir
Just a suggestion. Subtitle will help a lot.
Mr. Java
🙏😢Awesome sir ...
You make it easy..
❤no word to say ...
Way of Explanation is Wonderfull !
Best teaching style............. Thanks Alote.....................
Concept explanation is awesome. Thanks.
:)
thanks sir for giving valuable classes @ free...
hello sir, your classes are excellent but if u upload the remaining map and queue videos also it will be very beneficial for us
You are doing good sir, Please correct for people, who are following you. Underlining data structure is HashMap not Hashtable.
Your comment is wrong. Underlying data structure for HashSet is Hashtable not Hashmap. As it implements the Set Interface, duplicate values are not allowed. Objects that you insert in HashSet are not guaranteed to be inserted in same order. Objects are inserted based on their hash code.
The accent was too strong, so had to pay very close attention on the english part, but the explanation was very good! Thanks.
I appreciate you for not using bad words. He is from south India and people there find it hard to pronounce the correct way. Some british and EU ppl use bad words to express there hatred for bad accent and ignore the effort in teaching stuff.
tHe_VaGaBonD ....yes man...even I m happy...he has explained very nicely...
People in South speak English quite nicely and only few who come from smaller towns talk like this. I dont mean to offend the teacher because he is teaching well but just saying based on what I've seen. I have seen people speak English worse than this in North. Outside big cities like Delhi, North Indians speak English quite poorly with an ugly accent whereas most people in South can speak basic English.
English is his third language. so ups and downs are natural. teaching on the other hand is the best
At best he is not adding fake accent. He is natural with a immense knowledge.
Hi Sir,
Thanks for providing high-quality learning resources. You teach really well.
I have one question like in an ArrayList after 100% capacity reached new ArrayList is created, similarly, if we create a HashSet with an initial capacity of 10 when the new HashSet will get created i.e when inserting 8th element or after inserting 7th element.
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I think after trying to insert 8th element
in the example of hashset , i have to use javac -xlint
How does the the hash set extend there field. In the case of arraylist all the data is transferred to a newly formed big fields ,what procedure is followed in the hashset.
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Than k you Durga sir
I want to know Sir you are saying that new HashSet is created when 75% of 1st HashSet is filled but what is the size of new HashSet?? Is there any rule/formula to calculate size of new HashSet?
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It gets doubled each time whenever it is completely loaded...I.e., 16,32,64.....
Awesome Explanation ... Thanks a lot .... please let us know if you have anything in C# side or C++
What is the meaning of underlying datastructure for HashSet is hashtable?
'null' insertion is not allowed in Hashtable but it is allowed in HashMap.
Better run example using Eclipse and show the hash details
Load factor is about when will be new HashSet will be created?
but
what will be the new capacity?
'The initial capacity of HashSet is 16. When the load factor (0.75) is reached, i.e. 16 * 0.75 = 12; on the insertion of the 12th element the capacity is doubled, i.e. it becomes 32.'
Very nicely explained
Very good explanation
Sir, We use Arraylist for frequent retrial because its implements RandomAcccess. then why we use hash set for frequent retrial which will not implement Random access...
Ranjith reddy
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following
sir it is not giving false. If values are same so .Only it is ignoring that.
awesome tutorials....underlying data structure of hashset is hashTable as sir said in video but when i google it every where i find internal implementation of hashset is hashmap. so it becomes bit confusing. which one is underlying data structire please clarify as soon as possible.
hashmap indeed. 'This class implements the Set interface, backed by a hash table (actually a HashMap instance). It makes no guarantees as to the iteration order of the set; in particular, it does not guarantee that the order will remain constant over time. This class permits the null element.'
sir,
if load factor is 0.75 and initial capacity is 16.
After inserting 12 elements what will be the new Capacity?
i mean how it grows further?
it get doubles that means 16-32,32-64..........
Hello sir, is ppt available for whole collection Framework playlist ?
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what is the size ratio with which the object will be recreated after the max capacity is reached? like for arraylist , the new size of arraylist is 3/2*originalSize +1
The size will double . czcams.com/video/fSjxhOYPBRI/video.html
Which method is used to find the default capacity in hashset?
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Hi Sir,can you please tell me how hashset internally work in java that video please
very nice sir..
How to find first and last element in hashset sir. Is there any predefined method.
I think if we can iterate over iterator, so maybe no, because iterator has only next method
This is his native prononce .new capacity is 16 while debug time u can find out
What is meant by underline data structure and hash code????
superb video sir....
Dharmendra Kumar
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sir u r great
I am using default load factor 0.75, and it reaches now new Hashset will be created , What is size of new Hashset ?
Any formula is there to found ?
'The initial capacity of HashSet is 16. When the load factor (0.75) is reached, i.e. 16 * 0.75 = 12; on the insertion of the 12th element the capacity is doubled, i.e. it becomes 32.'
REPLY
plz add remaining videos of collections also...
Please have a tutorial for concurrent hashmap
Sir underlying data structure for HashSet is HashMap .
Please correct me if I am wrong
Because Hashtable doesn't allow null value.
yes underlying Data Structure for HashSet is HashMap but HashMap is internally implemented by using Hashtable only.
Thats why in general we consider underlying data structure for both HashSet and HashMap is Hashtable.
Thank u sir
Durga Software Solutions thanks a lot...even I was thinking d same...how come Durga sir can do mistake...
whats the new capacity of new hashset that you not specify
'The initial capacity of HashSet is 16. When the load factor (0.75) is reached, i.e. 16 * 0.75 = 12; on the insertion of the 12th element the capacity is doubled, i.e. it becomes 32.'
REPLY
FOR QUICK OVERVIEW:(these are timestamps)
2:57
7: 46
14:27
17:25
Hello Sir..could you tell us how to find capacity of HashSet(Not size of HashSet) ...Also after0.75% fill ratio of how much capacity new HasSet gets created?
go to paid tutorial!!!
'The initial capacity of HashSet is 16. When the load factor (0.75) is reached, i.e. 16 * 0.75 = 12; on the insertion of the 12th element the capacity is doubled, i.e. it becomes 32.'
REPLY
What about new Capacity formula
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Good video
sir please upload Hashtable video
sir please guide me on hashtable or upload video for hashtable..
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this video is good bcz less timing video
Thank you sir.. and can you possible to upload java.util.concurrent package? Some people asked in interview room.. I want more knowledge on concurrent package sir..
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how to treat with equal and hashcode methods
in hashset when the duplicate occur in hashset program
like this example ..
package collectionns;
import java.util.HashSet;
public class hashseterror {
String language;
int year;
public hashseterror(String adress, int age) {
this.language = adress;
this.year = age;
}
public String toString() {
return language + " " + year;
}
public static void main(String[] args) {
HashSet hash = new HashSet();
hash.add(new hashseterror("java", 2015));
hash.add(new hashseterror("java", 2015));
System.out.println(hash);
}
}
please explain video to treat with this error
please upload java applet videos
but you never talked about how or why it is best for search operation ?
I was expecting something about it....
Because hashing techniques have O(1) time complexity for their search operation.
nice tutorial :)
Kenneth John
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What is hashCode?
Its a numerical number to identify an instance/object, you can acquire it by calling Object.GetHashCode() method (C#).
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