Core Java With OCJP/SCJP: Collections Part-9 || comparator

[@ishu8981]

I dont know your profit in this, but trust me through these videos u are helping millions of needy and poor freshers....

[@sushma6314]

ishu singhal really ! I wish he prospers a lot !!

[@shraddhajayaraman]

his videos give direction to lost freshers too.

[@ranjeetbiet5061]

Amazing sir ..way of teaching is excellent

[@jaganmohanmylapuru5974]

many of your students and followers are now earning lakhs of rupees as packages and leading better life with their families . All the credit goes to you sir Thank you is a small word.

[@DurgaSoftwareSolutions]

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[@niftymiller6057]

Not sure how many patience to see this, i have around more than 10+ years experience. I found this to be extremely useful for me. Durga Sir, i cannot imagine how much effort you spent in educating students inclassroom and now i see on youtube. God Bless you and your good work should continue. I am sure many utilized your knowledge and gained in professional life. Kudos

[@DurgaSoftwareSolutions]

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[@raviprabhat5794]

Respect to Durga Sir He makes us dreamer. Thank you so much sir

[@SameerKumar-sy5zb]

God level explanation.Crystal clear explanation.Just waiting for days when Durga sir will teach DSA in Java.

[@DurgaSoftwareSolutions]

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[@azureaqua2218]

Then every student of Durga sir will be placed in google , apple sort of product based companies ...Durga sir is a god of JAVA

[@MultiDora30]

Durga Sir , U are the best in java . Simple explanation even the complex text books failed to explain me. Thanks a lot for Helping us in this way. In the background, So many students are getting benefitted from these videos. I live in US , I have 6+ years of experience . Till date in my Career . I dint see anyone explained this clear and detail . Hands-off to you Durga Sir.

[@lpavan09]

Simply Superb explanation Sir. The way you provide the examples and the way you turn the most confusing topics to very simple topics is extraordinary.

[@md.ruhulamin7963]

What an explanation sir!!! I never saw this type of teaching in my life. Durga sir is the best.

[@DurgaSoftwareSolutions]

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[@ankitasaini2321]

no body can explain collections better than you.....thank you sir....

[@DurgaSoftwareSolutions]

Helloankita, Thanks for your valuable feedback.It will boost us to do new things. Please subscribe to get updates about new videos. You can view all other Core Java with SCJP/OCJP Videos by Durga sir in the following link: goo.gl/U1KKyi You an see more Java videos following link: Java tutorial by durga sir goo.gl/XWb4RL Java 9 by durga sir goo.gl/hXGyBW Java 1.8 Version New Features by Durga sir goo.gl/iHXXYU Adv Java JDBC Tutorial by Durga sir goo.gl/8q16Eo OCJA 1.8 Java SE 8 Programmer - I (1Z0 - 808 ) By Durga sir goo.gl/gC6R7f Core Java by NagoorBabu sir goo.gl/s6Nvj1 Advenced Java by Nagoorbabu sir goo.gl/ZZonzJ CoreJava by Ratan goo.gl/3VM19v Advanced Java jdbc by Ratan goo.gl/Rn2UXr Advjava tutorials - JSP by Ratan goo.gl/Z6ytxm Adv java servlets tutorial by ratan goo.gl/zTwi9y Servlet and JSP Tutorial by anji reddy goo.gl/jZMRUv Advanced Java Jdbc by Anjireddy goo.gl/16CGzX Hibernate byAnjireddy goo.gl/qQojvZ Struts by Anjireddy goo.gl/nE1Eof Spring by Mr.AnjiReddy goo.gl/NfN14R ADV JAVA by Naveen goo.gl/bhSsXF Spring by Mr.Naveen goo.gl/huVwFN Hibernate by Mr. Naveen goo.gl/TY3Wpd Struts by Mr.Naveen goo.gl/Vkmiw7

[@pallavijadhav370]

Durga sir is the heart ❤ of java . All video is very helpful for me to understand java concepts deeply. Thanks from hurtly sir..may God bless 🙌 you !!

[@DurgaSoftwareSolutions]

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[@venkatnaresh548]

Durga sir...u always rock, I know u from last 15 years, u r my gate trainer in vani institute

[@DurgaSoftwareSolutions]

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[@sonalgupta791]

God bleas you❤

[@nagamaheshdulipalla4660]

Ur giving food to thousands of people

[@DurgaSoftwareSolutions]

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[@javatraining3903]

Great Explanation!! God bless you!! I will not forget these concepts in my lifetime

[@vursha7033]

Sir u r extraordinary hats off.. Thanks a lotttt sir.....

[@nilesh7345kaka]

Sir To good Your videos are really helping poor ones and poor techies

[@DurgaSoftwareSolutions]

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[@prashumatoori8011]

Hi Durga sir.. Thank you so much for your teaching Java. I am very interested to watch your vedios to learn Java. I am a big fan of you. Your way of explanation is awesome. Thank you sir

[@DurgaSoftwareSolutions]

Hello Prashu Matoori. Thanks for your valuable feedback. It will boost us to do new things. Please subscribe to get updates about new videos. You can view all other Core Java with SCJP/OCJP Videos by Durga sir in the following link: goo.gl/kqvaf2

[@omkarpingale3019]

The best explanation ever..ty durga sir

[@DurgaSoftwareSolutions]

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[@omkarpingale3019]

@@DurgaSoftwareSolutions pls upload video for Optional class (JAVA 8)

[@EngineerVaibhav]

The important thing that is compare () and compareTo() methods is very important for TreeSet class.

[@shaikkhajapasha2405]

your teaching is awesome sir you are too good and explain ing method is also very very good

[@DurgaSoftwareSolutions]

Hi Shaik. Thank you very much for your feedback

[@nitinsuman3362]

God of Java..Hatsoff to you sir..

[@EngineerVaibhav]

144 video completed🎉❤

[@shashanknaag4910]

Perfectly explained

[@DurgaSoftwareSolutions]

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[@shreyaagarwal6746]

I wish I had taken your tutorials earlier. So to the point and clear.

[@rounakbajaj1273]

Exactly..same here..some things in this video is new for me..from what i have learnt before..if i know this earlier then it would be great ..directly to the point...

[@sonnix31]

Excellent, best teacher ever. Thank you!

[@DurgaSoftwareSolutions]

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[@rohithk6878]

this is good helpful videos to forgive so much doubt & concepts explaining to weak students is such aey fantastic

[@DurgaSoftwareSolutions]

Hi Rohith. Thank you very much for your feedback

[@rajeshjha9359]

amazing explanation to become COLLECTION KING

[@DurgaSoftwareSolutions]

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[@TipsForTechOfficial]

Sir U Are really Great, i love your Pedagogy..

[@DurgaSoftwareSolutions]

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[@prashantmore8489]

If u have doubt in comparable and comparator watch this awesome video 👏

[@DurgaSoftwareSolutions]

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[@rockbrand753]

Thank you so much Sir :) May God give you Happiness, Health, and Wealth. you are amazing personality :) Thank you thank you thank you sir :) :)

[@poojagarg6979]

thanks a lot sir.... every tough concept become so easy and clear after learning from your tutorials.... /\ You are just amazing... hats off to you..... :-)

[@DurgaSoftwareSolutions]

Hello Pooja. Thanks for your valuable feedback.It will boost us to do new things. Please subscribe to get updates about new videos. You can view all other Core Java with SCJP/OCJP Videos by Durga sir in the following link: goo.gl/U1KKyi You an see more Java videos following link: Java tutorial by durga sir goo.gl/XWb4RL Java 9 by durga sir goo.gl/hXGyBW Java 1.8 Version New Features by Durga sir goo.gl/iHXXYU Adv Java JDBC Tutorial by Durga sir goo.gl/8q16Eo OCJA 1.8 Java SE 8 Programmer - I (1Z0 - 808 ) By Durga sir goo.gl/gC6R7f Core Java by NagoorBabu sir goo.gl/s6Nvj1 Advenced Java by Nagoorbabu sir goo.gl/ZZonzJ CoreJava by Ratan goo.gl/3VM19v Advanced Java jdbc by Ratan goo.gl/Rn2UXr Advjava tutorials - JSP by Ratan goo.gl/Z6ytxm Adv java servlets tutorial by ratan goo.gl/zTwi9y Servlet and JSP Tutorial by anji reddy goo.gl/jZMRUv Advanced Java Jdbc by Anjireddy goo.gl/16CGzX Hibernate byAnjireddy goo.gl/qQojvZ Struts by Anjireddy goo.gl/nE1Eof Spring by Mr.AnjiReddy goo.gl/NfN14R ADV JAVA by Naveen goo.gl/bhSsXF Spring by Mr.Naveen goo.gl/huVwFN Hibernate by Mr. Naveen goo.gl/TY3Wpd Struts by Mr.Naveen goo.gl/Vkmiw7

[@balakrishna2571]

no one can teach like you sir

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[@pawankumaryadav1947]

your are great sir father of java in india

[@DurgaSoftwareSolutions]

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[@nareshshama1982]

sir, as you said we use comparable only for default natural sorting order, but we can do customized sorting too using comparable too. like public class Emp implements Comparable{ int empid; String empname; public Emp(int empid, String empname) { super(); this.empid = empid; this.empname = empname; } @Override public int compareTo(Emp e) { return empname.compareTo(e.empname); }

[@DurgaSoftwareSolutions]

Hello Naresh. Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@abhilashkokkonda1713]

Thank you very much sir. I owe millions of rupees to you.. U r a god of collections _/\_

[@DurgaSoftwareSolutions]

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[@ranveervaghela7030]

Completed watching on Oct 07, 2024 at 7.09 PM :) :)

[@rizwanshahid1447]

Thanks so much, Durga Sir.

[@muhammadahmadi7799]

Sir you are the best!!!!!

[@DurgaSoftwareSolutions]

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[@kvbr522]

Thanks for uploading the videos ,really I am very understood for the videos,u r a.unic style in teaching field,my guess really Java means Durga sir

[@DurgaSoftwareSolutions]

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[@EngineerVaibhav]

Comparable interface and Comparator interface play big role in TreeSet concept.

[@balasahebbande5495]

greate teacher for java

[@DurgaSoftwareSolutions]

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[@mithunrocker]

You are simply awesome!!!

[@DurgaSoftwareSolutions]

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[@saiyashwanth1991]

He is just telling how the language is working not insisting on what algorithms the methods use,for example comparator uses for Integer a combination of merge sort and Insertion sort called tim sort,why it is used and what's exactly this does.it should be focused because if one learn java it does'nt mean one can build google or microsoft one should learn basic algorithms behind the methods to understand language in a greater depth.

[@ankitadixit5875]

Hmmm..... So from where do learn implementation.. If u could help

[@jvsnyc]

Yeah, but a huge number of HackerRank or LeetCode problems that one is very likely to see in context of Interview process will be hugely helped by knowing this. It is formally part of the OCJP preparation anyway. It isn't really supposed to be a drop-in replacement for a full algorithms course.

[@poojak1742]

you are super sir. excellent teaching

[@rekyanayak3780]

TreeSet not allow duplicate but, in TreeSetDemo3 we are adding 20 two times for both Comparable, Comparator Why don't we get Exception?

[@DurgaSoftwareSolutions]

Hello Rekya. Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@mohanrammanikandan7939]

Hello, Rekya. Good Question. TreeSet will not allow duplicates based on comapreTo() or compare() methods return value. If those methods return 0, then duplicates will not be inserted. But in Durga sir's example TreeSetDemo3, the methods are overridden in a way to allow duplicates. Please re-check the video from 44:00 to get more insight. It will help you.

[@jvsnyc]

What we do here is but one example of what can happen if you ever return other than 0 from a Comparator being used for a TreeSet (or keys of a TreeMap) for values which would return true from .equals() -- this one is an obvious example we would never make a mistake like this in real life. But what if your Comparator ignored some data fields in your object that do get looked at in your .equals() method? Every Comparator used needs to respect the .equals() case of natural sorting order or these kind of things can happen. Nothing in Java magically protects us from running over our foot like this.

[@utsavmodh9698]

I think java is not owned by Oracle but its owned by Durga sir 😅

[@DurgaSoftwareSolutions]

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[@santhoshkoduri223]

i never listen this type of teaching in my life

[@VikahKumar-g6s]

Thank you will be a small word as u are explaining the topics. Sir can allow all videos access of JDBC Please sir

[@DurgaSoftwareSolutions]

Hello Friend. Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@GyanMastiKiPathsala]

Perfect Teaching

[@surajsuryawanshi7835]

Sir as u said every collection takes object as input including treeset then why 37.00 programme not giving error as we are inserting directely integers insted of Integer objects

[@DurgaSoftwareSolutions]

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[@राजनगोंगल]

👍👍👍👍👍👍

[@jayantagarwal6339]

Thank you Sir🙏🏻🙏🏻

[@yogeshsolunke4379]

two methods are present in comparator interface compare and euqals then how it is functional interface?

[@DurgaSoftwareSolutions]

Hello Yogesh. Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@jvsnyc]

Abstract methods present in any interface that are identical to ones inherited from Object don't count towards that total. This is mentioned in his Java 8 courses and playlists, among many other places.

[@prathibhasanku6871]

how do the compiler is going to know that 10 being the root node is there any backend process

[@DurgaSoftwareSolutions]

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[@VikahKumar-g6s]

Sir please upload all videos of JDBC

[@DurgaSoftwareSolutions]

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[@chethanprabhu4475]

just a suggestion instead of giving if(i1i2) { return -1; } else return 0; Instead of all this just give 1 line return i2-i1; that's it.

[@sonnix31]

You need to watch the whole lesson. That code you just wrote is not better than what he explains.

[@chethanprabhu4475]

@@sonnix31 i said when you are working in an company. Because company expects you to write code with minimum time complexity.

[@chethanprabhu4475]

@@sonnix31 that suggestion wasn't for sir :) it was for viewers. Hope you get that :)

[@awraxzer]

@@chethanprabhu4475 It's a great suggestion, I like it.

[@jvsnyc]

@@chethanprabhu4475 There are dangers in the code you wrote as a substitution. Picture i1 is a very large negative number, and i2 is a decent sized positive number. Well, when you do i1 - i2 it will overflow and give a positive number. Positive number means i1 is > i2 which is NOT TRUE. 2. Picture i1 is a reasonable, decent sized negative number, and i2 is a VERY LARGE sized positive number. i1 - i2 will overflow and give a positive number, saying that i1 is > i2, but it is NOT! 3. Say that i1 is a decent sized positive number, and i2 is a very large negative number. i1 - i2 will overflow yielding a negative result, suggesting that i1 is > i2. But it is NOT. Say that i1 is quite a large sized positive number, and i2 is a decent sized negative number. i1 - i2 can overflow and get us a negative number, telling us that i1 is < i2. But, it IS NOT. For values like 2, 5, 12, 30, 7, 49, yes, you can take that shortcut and many books and tutorials show it. But it is not safe for all legal values of integers. You can sometimes get away with it because you know or hope you know the range of values that are ever going to be put into a particular TreeSet, etc. -- but what happens when you open your code up to others for use -- some of them quickly say your code is broken. Does i1 - i2 save so much time vs. (i1 < i2) ? -1 : (i2 < i1 ) ? : +1 : 0 that it is worth it?

[@sonamprajapati2843]

In case no 7 ...why only first element will be inserted and all remainings are consider as duplicate...??

[@DurgaSoftwareSolutions]

Hello Sonam. Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@shivalayayadav7685]

Because at first there is no elements to compare so it accept it....To compare ,at least 2 elements are necessary so after getting 2nd element it is eligible to compare and as he wrote [return 0] so for every comparison we get 0 ...(duplicate)

[@ibrahimshaikh3642]

nice explanation sir

[@ritikpatel7918]

sir why we go for comparator, why don't we override the comparable's compareTo method?

[@DurgaSoftwareSolutions]

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[@-AjayChauhan]

Completed this video Day 64 of #75daysofcode in Java 19 May, 2024

[@hasohasao851]

@Durga sir, I understand the basics including d concepts also while u r teaching bt sir, how to remember all these syntaxes? I mean sir these r so difficult to remeber all steps... Can u tell whts d procedure plz??? And thank you sir for ur free teaching classes. Staying in India u r lyk real hero sir. 🙏

[@DurgaSoftwareSolutions]

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[@mohanrammanikandan7939]

Excellent, sir. This is called a real post-mortem. You indeed did a post-mortem on the compare() method.

[@DurgaSoftwareSolutions]

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[@Pri_-]

Thank you So much Sir..:)..:)

[@shahzaiblashari7250]

just awesome

[@DurgaSoftwareSolutions]

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[@Sadhana1729]

TreeSet we are having descendingSet() method for descending order right? TreeSet T1= new TreeSet(); T1.add(15); T1.add(20); T1.add(25); T1.add(30); T1.add(35); T1.add(40); System.out.println(T1); System.out.println(T1.descendingSet()); Output: [40, 35, 30, 25, 20, 15]

[@DurgaSoftwareSolutions]

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[@shrutigawade3265]

Before execution of the descendingSet(), the compareTo() has executed and in ur example only the output of compareTo() has reversed not the total content..

[@prathibhasanku6871]

Also,why this tree set implents only inorder traversal but not preorder traversal and post order traversal

[@DurgaSoftwareSolutions]

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[@sahilk335]

Thanks for the video. Watch at 1.25X Speed

[@chethanprabhu4475]

Exactly wat i do😂

[@philomath_u]

44:00 to 50:42

[@vjsuslade2467]

Thank you sir you are great..

[@DurgaSoftwareSolutions]

Hello Suslade. Thanks for your valuable feedback.It will boost us to do new things. Please subscribe to get updates about new videos. You can view all other Core Java with SCJP/OCJP Videos by Durga sir in the following link: goo.gl/kqvaf2

[@paragladekar3174]

Sir u used int return type for int type of object then why don't you use string return type for string type of objects?

[@DurgaSoftwareSolutions]

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[@liferide2002]

Fantastic teacher. How can I support your channel ? do you accept donations

[@Abhinav2091]

if I use2nd case that is return with -ve how duplicate will get recognized I mean it will return 0 but I am returning -ve with it so it will be -0?

[@DurgaSoftwareSolutions]

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[@swathiranimamidala]

Can u provide hard copy notes fr reference purposes

[@DurgaSoftwareSolutions]

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[@akshatakabeer7794]

nice..

[@abhishekANAND-md1lq]

Why don't we declare Comparator as an Abstract class instead of Interface as it has concrete equals() method?

[@DurgaSoftwareSolutions]

Hello Anand. Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@VivekKumar-ol4wz]

sir,i have one doubt..... Why it is comparing always to the root element first(10)????? why not the recently added element????

[@sushma6314]

Vivek Kumar how would you know whether to go left or right of the root ? And once you know it say left and it has an element, again u have to check if you have to go left or right , so on..

[@sagarsune2739]

Can we do customized sorting by Implementing comparable interface

[@jvsnyc]

Whatever you do in your class by implementing Comparable interface is by definition defining the natural sorting order for that class.

[@poojagoyal8868]

sir..I have on doubt.. duplicates are not allowed in Set then how we are getting duplicates on return +1 Nd return -1.

[@poojagoyal8868]

one*

[@jvsnyc]

This is simply why you should never use a Comparator that returns -1 or 1 for elements that would compare with true for .equals(), but to only return 0 for those. If you don't follow that, you break the Set contract.

[@Lakshmankablog]

🥳🐎🤩👏👌

[@VikahKumar-g6s]

Sir please allow JDBC all videos

[@DurgaSoftwareSolutions]

Hello Friend. Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@RamaKrishna-ik4eo]

Hi ArrayList ar=new ArrayList(); ar.add(011); sop(ar); O/P: [9] can u please explain y o/p is 9 in above code ?

[@ExceptionalPOV]

By defining any integer value with a '0' as prefix you actually specify a value in Octal system. Which is nothing but (0*16)+(1*8)+1=9.

[@akhileshkumarbhagat9319]

Because 011 is the octal number, not a decimal number. The decimal number never starts with 0(zero). JVM internally converts 011(octal number) to decimal number. so result is 9.

[@DeepakKumar-mj3xw]

Thanks sir you have provided all theses video. Please can you upload spring

[@DurgaSoftwareSolutions]

Ya it is there Deepak... plz follow this link..

[@DurgaSoftwareSolutions]

kzbin.info_all_playlists?sq=spring

[@deepakp4526]

I am getting no page found if I am trying to ope this link

[@kharkharee]

The only drawback I see here is, it is very slow, but may be its good also for somebody

[@anuragsmusic]

You can change the playback speed

[@sqb8980]

I watch in 2x speed

[@ammulupriyanka7289]

i want durga sir chapter list of ocjp/scjp becasue i con't understand to start which cocept first

[@DurgaSoftwareSolutions]

Hi Priyanka. Plz contact our online team [e-mail] or call us on this number [phone]

[@revathikambham3629]

1. Language fundamentals 2.Declaration and access control 3. Operators and assignments 4. Flow control 5. Exception handling 6. Assertions 7. Garbage collections 8. OOPS 9. Multi-threading 10. java.lang.package 11. java.io.package 12. serialization 13. collection framework 14. generics 15. inner classes 16. internationalization 17. development 18. regular expressions 19. enum 20. jvm architecture

[@ammulupriyanka7289]

tnq mam

[@Dipthakkar777]

great videos, one suggestion - cut down time of videos by removing unwanted clips.

[@singhanand1236]

🙏🙏

[@Codingmuni11]

Durga sir is java father............

[@DurgaSoftwareSolutions]

Hello Deepak. Thanks for your valuable feedback. It will boost us to do new things. Please subscribe to get updates about new videos. You can view all other Core Java with SCJP/OCJP Videos by Durga sir in the following link: goo.gl/kqvaf2

[@rahultej8352]

The signature of compare is "compare(T o1, T o2);" not "compare(Object o1, Object o2);"

[@darkillusionish]

that is syntax

[@jvsnyc]

He casually mentions Generics near the beginning of the Collections part of the playlist, then he goes thru all of the Collections part of the playlist almost ignoring Generics, then comes back later and teaches Generics. I doubt it would still be presented that way today, and I commented on that in other places, but whatever.

[@ankitadixit5875]

My code is not running... Some 1 plz help

[@DurgaSoftwareSolutions]

Hello Ankita. Plz contact our online team [e-mail] or call us on this number [phone], 7207212427/28

[@divyaprakash5128]

perfect*1000000000

[@DurgaSoftwareSolutions]

Hi Prakash. Thank you very much for your feedback

[@sharadvijay7013]

i dont want this BLOODY ascending output hahaha

[@mayankkesari3687]