Core Java With OCJP/SCJP: Collections Part-14 || hashtable

[@KarthikC-ju4fx]

Thank you Durga sir.

[@dipalisoniofficial]

I never had known such a beautiful concept.... thank you so much for your efforts..May God bless you with good health

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[@haykmkrtchyan7093]

In my entire career I didn't see such an excellent explanation ever. Thank you sir.

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[@EngineerVaibhav]

149 video completed❤🎉

[@shivansugiri3110]

Sir your God of Java. Your name really suits, Durga maa is deity of Power you are deity of Java. Lots of love from Assam

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[@ankitchauhan7104]

Hashtable : 0:10 Properties : 49:00

[@skysefall7976]

0:00 - Hashtable. 49:00 - properties.

[@utsavmodh9698]

Wonderful content,always delighted to watch 🎉your video.

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[@sarbeshkumarsingh1328]

one of the best teachers.................

[@kamalapuramsivasankar7]

Thanks sir..

[@sanpanchapakesan7654]

Super knowledge Mr Durga. the Hashtable example I get a different output for the same program. My output is, {23=E, 5=A, 15=D, 16=F, 2=B, 6=C}

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[@yankiboy7519]

maybe this code can help u more to understand insertion Hashtable ht = new Hashtable(); ht.put(2,"a"); ht.put(3,"i"); ht.put(4,"f"); ht.put(5,"z"); System.out.println(ht.get(2).hashCode() % 11); System.out.println(ht.get(3).hashCode() % 11); System.out.println(ht.get(4).hashCode() % 11); System.out.println(ht.get(5).hashCode() % 11); System.out.println(ht); output is : 9 6 3 1 {5=z, 4=f, 3=i, 2=a}

[@ranveervaghela7030]

Completed watching on Oct 10, 2024 at 3.49 PM :) :)

[@srinivasaraovukkum7810]

Durga team...please you make precise videos of core java just like enum videos...so that we can complete more concepts....

[@ashutoshbhardwaj8001]

Sir it is request from whole world , please make videos on spring framework

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[@tejasmendhule1441]

god of java🙏🏻✌🏻

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[@sambhasin4]

Superb Explanation.....

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[@faizanali273]

sir, how can we praise you?? bcz your just amazing superb

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[@pranaychavan6951]

Deepest Learning Ever

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[@for461]

super explaination sir. It is internal working of hash map also

[@amitasn1]

At 40:11 When you override hashcode() second time , why you didn't divide hashcode method's result by initial capacity of bucket?

[@DurgaSoftwareSolutions]

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[@rkchauhan3493]

Bcoz Inside hascode() Method Sir Return i%9. So Sir Divide the Value By 9. Simple

[@sanjeevreddy3327]

Amazing explanation thank you so much sir

[@DurgaSoftwareSolutions]

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[@rizwanshahid1447]

Thanks so much, Durga Sir.

[@MadhaviGavhane]

I like.... Your all videos

[@2singam]

Thank you sir..!

[@Skripturz]

are search and retrieval the same?

[@shahzaibbaloch6140]

Just awesome

[@DurgaSoftwareSolutions]

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[@Lakshmankablog]

2022 👌🐎👍🤩🥳👏

[@shahzaiblashari7250]

superb

[@swapnilzurange223]

Hello Sir, very nice explanation. I want to know why Hashtable not allowing null key and value. can you explain please

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[@poornimamedar2758]

Hello sir, I have one doubt that is Hashmap is implemented on top of hashtable then also it accept null value but where as in hashtable does not accept null key and value. Why Hashmap accept null??

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[@NoName-is9qv]

4:09 12:25 55:50 2:05

[@jigneshparmar6481]

Very well explanation of hashtable but at the end you changed track over globalization which is not required for hashtable

[@jvsnyc]

I would say if people are going to watch this video at all, this is still important. For the most-part Hashtable is just a legacy class which can be mostly ignored, but Properties is still based on it, so I wouldn't complain about that part. It might be the last place you are using Enumeration, as well.

[@akshada3334]

can any1 tell me why constructor is used here in internal hastable in temp class

[@DurgaSoftwareSolutions]

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[@DeepakSharma-gl2ng]

my ques is who will invoke hashcode method since its internally called by tostring method but u have overridden tostring also which is not invokeing hashcode method .... sir plzz do reply thank u

[@vishalpanwar9550]

It is called by put method internally to find the bucket location.

[@AmitSingh-dd4dt]

If Hashtable does'nt implement Random Access, how it is good for search property?

[@DurgaSoftwareSolutions]

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[@pranavhanwante5301]

Bro any update about this?

[@rishipatel1989]

@@pranavhanwante5301 Although hashtable not having feature of random access, it finds value based on hash code so that's why it is good for search

[@pranavhanwante5301]

@@rishipatel1989 ok, thanks for replying bro

[@sudheertalluri6744]

Sir, I'm getting different output for the same Program.. And one more thing is does bucket contains key and value pair or only value if only value then how the program output has the same hashcode value that we entered instead of modular hashcode i.e. if we enter 33 as hashcode for capacity 11, then it is stored at bucket-2 and while it is printed then we are getting back 33 in output.. I will be greatful if get answers for these questions, Thank you sir..

[@sudheertalluri6744]

My code: import java.util.*; class HashtableEx{ int i; HashtableEx(int i){ this.i =i; } public int hashcode(){ return i; } public String toString(){ return String.valueOf(i); } public static void main(String ar[]){ HashtableEx h1=new HashtableEx(5); HashtableEx h2=new HashtableEx(2); HashtableEx h3=new HashtableEx(6); HashtableEx h4=new HashtableEx(15); HashtableEx h5=new HashtableEx(23); HashtableEx h6=new HashtableEx(16); Hashtable H= new Hashtable(); H.put(h1,"A"); H.put(h2,"B"); H.put(h3,"C"); H.put(h4,"D"); H.put(h5,"E"); H.put(h6,"F"); System.out.println(H); } } My output: {6=C, 23=E, 2=B, 16=F, 15=D, 5=A}

[@DurgaSoftwareSolutions]

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[@shikharsaxena2566]

When I tried to execute the same program for HashMap I get the opposite order from what we get in HashTable..so can we conclude that Hashtable goes from Top to Bottom and Right to Left but HashMap goes from Bottom to Top and Left to Right..?? In all cases I got the same pattern for Hashtable and HashMap.

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[@rahulchowdhury4227]

But I'm getting the same order Top to Bottom and Right to Left in case of HashMap too

[@shikharsaxena2566]

@@rahulchowdhury4227 I don't know how you get the same output for HashMap..if it's possible then..share your gmail id I can share you the screenshot of my output which I am getting

[@rahulchowdhury4227]

Are you on Facebook?

[@ahmidahmid9303]

thanks

[@elitexmedia2899]

Hashtable size is doubled after 11 capacity is reached?

[@DurgaSoftwareSolutions]

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[@mohanrammanikandan7939]

Can anyone please explain my doubt with respect to the "hashCode()" method? In the below program, I have overridden "hashCode()" and "toString()" methods. why the "hasCide()" method is not called automatically? But in Durga sir's example program (starts from 16:00 to 25:00), the overridden hashcode() method was called automatically? Why so? What is the reason? Can someone please explain? Program: Class Test { int i = 10; psvm(String[] args) { Test T1 = new Test(); System.out.println(T1); } public String toString() { return i+" "; } public int hashCode() { return 200; } } Output: 10

[@DurgaSoftwareSolutions]

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[@sainath292]

@Mohanram......dear I am also having same doubt if we print S.O.Pln(t) internally object classto String() will be called then inside that Object class toString() by default hashcode() will be called ......but in this Temp from 16:00 code Temp class We overriden toString() ok when we call S.O.Pln(t); our class toString () will be called it's fine then how our overriden hashCode() will be called.?? ... sir could you please answer?? or MohanRam if u contacted could you please tell me??...let's catch up here how it is ??

[@DineshHase]

Ideally, when u try to print a statement then only toString method will be called.In object class toString() method, hashCode is included.but In your program u return only i+" " .So it will return that only i.e. 10. In durga sir's example hashCode method is used to get hashcode to arrange entry in hashtable......

[@mdwahid565]

Bahi Object class toString methods calls hashCode( which returns int value )and toString method turns hashCode value into hexadecimal form

[@mdkamranansari4493]

sir while running program of all legacy classes of java collection always error are coming saying cannot find symbol sir how can i solve this problem

[@DurgaSoftwareSolutions]

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[@xypq8310]

Is this used in real time java projects any more?

[@DurgaSoftwareSolutions]

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[@jvsnyc]

No. You really should be considering this legacy only in case you see it in old code on a job.

[@manishjaiswal7768]

Sir in hashtable if key is string type then how we can develop the program

[@DurgaSoftwareSolutions]

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[@samudralasrinivas1809]

sir, where i have to save the properties file

[@DurgaSoftwareSolutions]

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[@suppu3053]

Hi sir! why is serialization topic not in serial? I mean they are like this: part 3,part2,part4,part5,part6,part7 and where is part1 sir?

[@sanjaysinghsolanki2953]

nice sir

[@DurgaSoftwareSolutions]

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[@VivekPatel-qr2bb]

sir pls open one branch in delhi

[@poojagarg6979]

thank you ....

[@DurgaSoftwareSolutions]

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[@soujanyaayachitula9253]

Sir, i am not getting same results for Hashtable . I am using java 13 .Are there any changes for java 13, Kindly Reply as i have an examination

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[@azriaalain2854]

Hi Sir, I have a small problem with your code. My output is identically the same with this code h.put(5,"A") h.put(2, "B") etc... but with your code i have {6 =C, 2 =B, 5 =A, 23 =E, 15 =D, 16 =F} Sorry but i don't understand. Ty.

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[@MadhaviGavhane]

I want some basic programming as a fresher videos... Which are asked in interview. Can you please provide link to download this video? I am waiting for your reply

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[@AnkitKumar-td8rc]

Completed P-14 today (D: 8/12/24 , 9:45 pm)

[@nikhilarora3240]

Hi sir, Thanks for providing such wonderful lectures. Sir I am getting different output while trying to print the Hashtable and it is like this :{5=A,23=E,15=D,16=F,6=C,2=B}

[@DurgaSoftwareSolutions]

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[@gavravdhongadi9824]

Check your hashCode method

[@shristisrivastava4408]

Use method : hashCode() & not hashcode().

[@remorajesh122]

Initial capacity of treeset...pls tell.me sir...

[@sandesh3487]

treeset does not have any initial capacity because the underlying data structure is balanced binary tree.

[@sairajnagabushan835]

When i Execute the Below Code i got some mismatch in expected and actual result, using 1.8 and Win 10, can any one help me in this. public class HashTebleDemo { public static void main(String[] args) { // TODO Auto-generated method stub Hashtable h = new Hashtable(); h.put(new Temp(10), "A"); h.put(new Temp(15), "B"); h.put(new Temp(16), "C"); h.put(new Temp(17), "D"); h.put(new Temp(18), "E"); System.out.println(h); } } class Temp { int i; public Temp(int i) { this.i = i; } public int hashcode() { return i; } public String toString() { return i + " "; } } Note Im Using 1.8 and Win 10 Pro. Actual O/p : {17 =D, 10 =A, 18 =E, 16 =C, 15 =B} Expected O/p : { 10 =A, 18 =E, 17 =D, 16 =C, 15 =B}

[@DurgaSoftwareSolutions]

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[@GalaxyStriker619]

This is because u r using method name as hashcode.... However it should be hashCode .... Upper case C

[@jvsnyc]

@@GalaxyStriker619 This is why I am a fan of @Override annotation!

[@priyankashaw1238]

My output is {5=A, 23=E, 15=D, 16=F, 6=C, 2=B}. Can anybody help.

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[@top5things968]

Thank you so much Durga sir .

[@UdayKumar-gu2sg]

Is there any notes available from Durga sir

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