Interview Question | Comparable vs Comparator Detailed Explanation with Example In Java | JavaTechie

This tutorial You will learn What is Comparable & Comparator in Java
When to use Comparable
When to use Comparator
How to add multi compare logic using Comparator
#javatechie #InterviewQA #Java #Collection
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[@RaviShankar-xy6zh]

Buddy you always bring the insights of strong concepts through your eloquent videos. Need of the hour

[@Javatechie]

Thanks buddy

[@vasanthraj3883]

Very helpful for me, thanks sir.

[@josephthecreator]

Extremely helpful, thank you for this tutorial!

[@imBalji]

Excellent explanation. Thankyou sir

[@vengateshm2122]

Indeed very useful. Thank you.

[@sivajames07]

This is the most interview question I have been asked for many times

[@sathiskumarp]

Good one

[@shyaammuthusamy7370]

Awesome explanation.

[@sujithasugumar543]

Awesome explanation thanks a lot

[@crazycom7819]

Good topic

[@arhianalbis918]

The T chart at 0:55 is gold!!

[@foodgallery5819]

Thank you :)

[@fuadgafarov]

Thanks

[@tanujkumaragrawal4756]

❤

[@natureParadise777]

Good one, please keep uploading video like this

[@anugantigowtham]

Explanation is straight to the point but , it would have been better if you had explained the contract between hashcode and equals also.

[@adityavyas6603]

Java Basant..
Very good video
Please create video on Junit testing
Mockito wiremock etc

[@Javatechie]

Hi Aditya , mockito video is already there please check in my channel

[@jyotisstyle]

Sir, Can you please make one video on STATIC keyword? In interview they always ask about static keyword in JAVA.
Thank you in advance.

[@ashimroy3891]

If ever encountered that two objects have the same ID, what if I straight away deny that it is not possible. Will it be wrong ?

[@Javatechie]

Of course it's wrong that's the point of equals and hashcode contract you need to customize it as per your usecase

[@arhianalbis918]

Question: could you make a generic comparator if instead of passing you pass it and then you could sort any type of object by name or id or whichever parameter you specify, not only Student-type objects?

[@Javatechie]

I will definitely try that

[@arhianalbis918]

@@Javatechie Great. I would love to know if it works.

[@RAJU9622]

Thanks Basant is it any different way we can achieve using Java8 streams?

[@Javatechie]

Yes buddy . Already i explained how to use functional interface with lambda please checkout my java 8 playlist

[@ShinAkuma]

Not a good idea to create a separate class for every different comparator. Better to use lambda expression in Collections.sort();
I also faced this question today in an interview.
Suppose I have an Employee class like this,
Employee has a EmployeeID, EmployeeName and Department.
Now I have a Map like this. HashMap = new HashMap();
Sample data:
hm.put( new Employee(1, "Basant", "DepA") , 0);
hm.put( new Employee(2, "Rahul", "DepB") , 0);
hm.put( new Employee(3, "Sunny", "DepA") , 0);
Now using Stream, I need to get the result like this.
[ DepA => [Basant, Sunny] , DepB => [ Rahul ] ]
Basically we create a Department pojo with String name variable. And return the result in this format.
ArrayList< ArrayList >.
I wasn't able to do it at the moment in the interview, but later on I did it,
If you could cover this questions in a video as well, it would be very helpful to a lot of people.

[@Javatechie]

Thanks buddy this we can do using grouping method of stream

[@pramitranjan4338]

Bhai please make logical coding video using Java 8

[@Javatechie]

Yes I will do than

[@ktmurali3274]

Please upload ReactJs

[@Javatechie]

Will start soon

[@ktmurali3274]

Please upload ReactJs it is more helpful us

[@kumaresanperumal2581]

Thanks