Core Java With OCJP/SCJP: Collections Part-11 || Map || Hashmap || linked Hashmap
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- เผยแพร่เมื่อ 10 มี.ค. 2016
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This man Should be honored with "Bharat Ratna" Award. Its because of your videos I have cracked 10 interviews and currently working in my Dream company Adobe.
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Bro can you tell us what all you prepared and which TH-cam videos you followed please
It will help many @shubhchourasia
Map : 1:32
Entry Interface : 32:04
HashMap : 39:21
How to use Map Interface methods : 51:04
What is the difference btw HashMap and HashTable? : 1:09:45
How to get syncronized version of HashMap? : 1:19:55
who is learning core java in 2022 by Durga sir.........Love u sir..👌
learning in 2024..........
@@meghas2481 it will be very helpful learn continuously this lecture
@@multibasicterm2681 yes
Sir ...you are the best Java teacher you explain so well you actually clear all my doubts related to collection ...but your way of teaching in previous collection series is much better than this collection series...in that series firstly you explain concept then provide note in the form of PPT ( slide) sir please make video like that ...that way of teaching is really very good ..and also making note is also easy in that case... Thankyou for providing such a great leacture to us with free of cost..
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♥️💗💝
Best Explanation of Collection framework in Java on whole TH-cam | Watching on March, 2024
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One of the best tutorials for Java available online. Durga sir, your teaching quality is unparalleled. All other online java tutorials are nothing infront of your tutorials. For a beginner like me, you have made Java so simple that now I do not have any issues with it.
Keep up the good work Sir. Wish you all the best.
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I have went to many institutes but I didn't get any idea on java.
At some point i lost hopes on java and my career then my friend referred me your channel sir. Now after listening your lectures,I have no words to compare your teaching skill.
But i strongly believe that god came into my life to teach me java and also to give hope on my life and career in the form of durga sir 🙏🏻
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one more difference between HashMap and HashTable is that whenever we iterate entry from hashMap it will iterate in ascending and in HashTable it will come in descending order naturally (*if key will be integer number)
This is the Best video tutorial on java collection - map interface
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A big thanks Sir. This is called a Lecture with awesome explanation.
Best teacher in java. I havent seen god but i have seen him teaching me java.
U havent seen but seen his teaching java? Contradicting
Your way of explanation making me to love Java. Thanks a lot sir. Very clean and clear.
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Durga sir you ar my favorite teacher till date.but i was surprised how you didn't explained the concept of hashcode and equals method also the linkedlist inside buckets..i was ruined by interview pannel several times ..i thought this video Was sufficient.. sir i would like to thank your classes have really been helpful...i got to know java because of you.thanx sir.
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Thanku so much for Awesome Lecture Sir, I am big fan of yours.
Thank you very much Durga sir for this in depth explanation.
Sir , i just came across your video and u explain concepts in depth and in a way that everyone can understand , Thank you very much Sir . You are simply amazing . :)
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thank u very very much sir for ur clean explanation and depth explanation... Really Sir U are the God of JAVA... Sir
cinema hahaha.....lots of love and regards from liverpool.
Thanks a lot for this detailed video explanation of collection
I am an Apex developer.you are seriously AMAZING 👌.you explain everything in detail.because of this video,I have a better understanding of maps.thank you so much👍💎
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thank u very very much sir for ur clean explanation and depth explanation... Really Sir U are the God of JAVA... Sir please upload all the videos related to String Handling.................
Great work.. Sir every one expecting Internal implementation of HashMap ?. Could you please explain it. Once again for your great work..
retrieve keys 28:30
** retrieve only keys: Set keySet()
** retrieve only values: Collection values()
Key + Values = Entry
Set entrySet()
Entry interface 31:50
without existing Map object, there is no chance of existing Entry object. So Entry is an inner interface of Map interface.
Thanks a lot sir ,I've passed the Oracle OCPJP 6 exam recently with 88%. thanks a lot for your perfect explanations. The topics which seemed tough in K&B book , you made them sound very easy.
Thanks again sir.
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I am already a subscriber of your channel. I saw a new series coming up for OCP 8 ! Keep up the great work! Thanks
Happy Teachers' Day Sir:)
I got your fan sir, the way you have explained string logics is awesome. Please make one generic video where we can cover all string and collection concepts.
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Hi Sir,Your knowledge is wonderful.Thnaks a lot for sharing with us.I haven't found this kind of knowledge in any website.
After watching the video ,in some java documentation I found that Map.Entry is a static interface .Why should it be static.Static means something related to class then here why interface is static?
Thank you sir...nice explanation. please upload part 13th of this series
Sir You are the best java trainer. In this video you have not taught how hashmap works internally. Kindly upload the same.
good advertisement regarding full-stack developer.
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Sir you covered each and every thing
Your explanation depth is really fantastic.
Thank u Jajoo for your feedback
Thanks for such awesome explanation.
When we print entrySet , it is printed in following manner: [K=V, K=V,...]
Is there any toString() method in action here..?
Thanks for the video
adding null values at first in treeset was possible until 1.6, but not from 1.7.
it was considered as defect and java fixed it. now we cannot add null value even at first.
Thanks for info
he mentioned this in last videos
Yes he has mentioned in previous videos🎥.
thank u very very much sir for ur clean explanation and depth explanation.
Hi Akshay.. your wishes motivating me to do more for you. You Can watch complete Core Java videos by clicking these links...
1.Core Java With OCJP/SCJP-Language Fundamentals
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2. Core Java With OCJP/SCJP-Operators & Assignments
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3. Core Java With OCJP/SCJP-Flow-Control
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4. Core Java with OCJP/SCJP-Exception Handling
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5. Core Java with OCJP/SCJP - Multi Threading
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6. Core Java With OCJP/SCJP-Declarations and Access Modifiers
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7. ore Java With OCJP/SCJP- OOPs(Object Oriented Programming)
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8. Core Java With OCJP/SCJP- Generics by Durga
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9. Core Java With OCJP/SCJP: Collections by Durga
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10. Core Java With OCJP/SCJP: Garbage collection by Durga
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11. Core Java With OCJP/SCJP: java lang package by Durga
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12. Core Java With OCJP/SCJP: RegularExpresions by Durga
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13. Core Java With OCJP/SCJP: File I/O by Durga
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14. Core Java With OCJP/SCJP: Concurrent Collections by Durga
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15. Core Java With OCJP/SCJP: Serialization by Durga
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16. Core Java With OCJP/SCJP: Inner class by Durga
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17. Core Java With OCJP/SCJP: Assertions by Durga
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18. Core Java With OCJP/SCJP: ENUM by Durga
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19. Core Java With OCJP/SCJP: Interafe and Abstract class Loopholes by Durga
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20. Core Java With OCJP/SCJP:Devlopment by Durga
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21. Core Java With OCJP/SCJP:JVM Architecture by Durga
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thank u.
Durga Software Solutions
thanks lot for giving exclusive java content
Thanks so much, Durga Sir.
thanks sir for all valuable tutorials !! it is very informative with clean and clear explanation
Hi Amit. Thank you very much for your feedback
sir you said that when there is a condition like .interface A{
interface B{
}}
the inner interface is always public and static by default and we can access them directly.
In your inner class video.
Sir do we have advanced java concepts..?
If yes can u give me the link
146 video completed❤🎉
Hats off!! Fantabulous
Great work Sir !!! Thanks much for all the videos !! _/\_
Thank you from bottom of my heart 😊
Nice explain sir
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we love Durga SIr❤❤❤
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Best Explanation
dear sir,
Map concept vedios are not in youtube fully....please provide all sir..i need it
thnk you for giving valuable information
Never seen such teacher before ever
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Thank you so much 🎉
Question : suppose I have a alphabates A to Z with some random Integer values, then how I can put them in hashmap and get output if user put A then ans will be 2 like this
HashTable is Underlying data structure or implementation class,because for HashMap,LinkedHashMap,HashSet,LinkedHashSet underLying Data strucure is HashTable
Thanq sir...tasks completed
Best explanation
clean explanation...........
you are best sir.......no words for you
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thnk you sir giving valuable information about HasMap and LinkedHashMap,,,,,sir please provide String handling Also..i need it
There is no slide for this video. Can anyone tell me if I can get the slides for this video thanks
Thank you so much Sir..
your explanation is very comprehensive. Sir can you kindly classify the videos in some organized way.
It appears in at least three playlists. This is one of them:
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Thanks sir..
sir please take "Ugh" and "VII" as keys and put them in Hashmap sir
There is doubt in methods access modifier, if methods of Hashmap have "default" access modifier then how would be possible to access those methods in other package
Hi Durga sir ,teaching style (super ,good ) i Need how Hashmap work Internally ,please share me any videos. hlp me
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Based on hash table
Thanks I wil do
Implementing classes for Entry are
1) AbstractMap.SimpleEntry
2)AbstractMap.SimpleImmutableEntry
Best Concept
I got the answer sir..Pls correct me if I am wrong. Map.Entry is static so that we can do any operations with objects in Entry(Key,Value) .Simply by using Interface name we can call methods ..
You just 'Broke the Ice" on Collection and hashmaps as simple as that.
thank you sir
awesome sir
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Add value for a duplicate key creates replacement with new value or it is an error?
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replacement of old value with new value & returns old value.
sir nicee
Hi Durga Sir ,
An interviewer once asked me 2 ways to synchronize hashmap . One is synchronizedmap which you have already explained in this video , which is the other method ?
typecast to hashtable?
concurrentHashmap() method
Thanks!
👍🥳🐎👌👏
sir please event handling ka video bniyaa
Lion enter in the field
Durga sir .......
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Sir, hashmap's underlying data structure is hashtable. So, the hashmap shd also be synchronized. But it is not. Why?
Both HashMap and Hashtable are implemented using Hash Table dataStructure.
Hi ratan sir....can u pls upload collections part-1,3,5,6,9....etc.some vedios have some problem sir pls check that vedios like collection part-1vedio .and once reupload pls sir.
Hi sir I have a doubt HashMap underlying data structure is HashTable right but why it is not synchoronized && Hashtable is synchronized then HashMap also synchronized right bcs of its data structure .
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Since there is no connection between collection nd mapp how we can use synchronised method of collection interface......
Pls someone give ans
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Hi Akash, it is not Collection Interface, this is Collections class which extends Object class, it has common methods of collection and Map interfaces related classes, and synchronizedMap() method is one of them.
god of java is durga sir
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Thank you!
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Java tutorial by durga sir
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Java 9 by durga sir
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Java 1.8 Version New Features by Durga sir
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Adv Java JDBC Tutorial by Durga sir
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OCJA 1.8 Java SE 8 Programmer - I (1Z0 - 808 ) By Durga sir
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Core Java by NagoorBabu sir
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Advenced Java by Nagoorbabu sir
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CoreJava by Ratan
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Advanced Java jdbc by Ratan
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Advjava tutorials - JSP by Ratan
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Adv java servlets tutorial by ratan
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Servlet and JSP Tutorial by anji reddy
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Advanced Java Jdbc by Anjireddy
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Hibernate byAnjireddy
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Struts by Anjireddy
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Spring by Mr.AnjiReddy
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ADV JAVA by Naveen
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Spring by Mr.Naveen
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Hibernate by Mr. Naveen
goo.gl/TY3Wpd
Struts by Mr.Naveen
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In interview I was asked this question
If equals is always true and hashcode is always same then how many objects will be created ?
Please can you answer Sir ?
only 1
As we know HashMap underlying data structure is HashTable so how there is difference between hashmap and hashTable
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All method of hashmap is non synchronized
thanks
Super..teaching
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Indian Hero in Java
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sir for KeySet(),values(),entrySet(), how can we invoke them using Map object?Map is an interface know sir!
We are invoking these methods on implementation of Map interface i.e HashMap class and not on Map interface.
Map.Entry is nothing but interface but then how the object m1 was created in the above example???Since interface objects can't be created?
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why entryset is needed when we are getting entries when we call the map object alone...Please explain?
EntrySet returns a set(array). map returns an object
Sir what is the difference in the code when we apply synchronization to the map???
synchronization provides Thread-safe
How to given dynamic value in hashmap in java
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Sir your teaching style is not compare with anyone I like your lectures too much please you teach spring also So many lectures I have seen but still did not understand so please refer good lectures for spring also
Thank you ..!!
Can you give a better example of key and value if both are objects? Not primitive data types like numbers 1,2,3 etc for key
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That is a good question, especially how much better and safer it is to ensure that such keys are immutable.
Genius
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Thank you sir.
Map.Entry m11 = (Map.Entry)itr.next();
this is throwing exception for me java.lang.ClassCastException : java.lang.String cannot be cast to java.util.Map$Entry
39:33
big fan sir...
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