Java Interview Questions and Answers | Java Tutorial | Java Online Training | Edureka

[@edurekaIN]

Got a question on the topic? Please share it in the comment section below and our experts will answer it for you. For Java Training Curriculum, Visit our Website: bit.ly/32Ymvde Use Code "𝐘𝐎𝐔𝐓𝐔𝐁𝐄𝟐𝟎" to get Flat 20% off on this training.

[@dominykaskisonas223]

4:15 What is the difference between JDK, JRE and JVM? 5:50 What is synchronization? 7:38 What are the differences between processes and threads? 13:36 What are Wrapper classes? 17:18 What purpose does the keywords final, finally and finalize fulfill? 21:20 What is the difference between StringBuffer and StringBuilder? 24:58 What are the differences between Heap and Stack memory? 39:03 What is the difference between Abstract classes and Interfaces? 53:14 What is the difference between method overloading and method overriding? 55:03 Can you ovveride a private or static method in Java? 55:43 What is multiple inheritance and does java support it? 59:03 What is a Servlet? 1:00:41 What is the difference between Get and Post methods? 1:04:45 What is the lifecycle of a servlet? 1:16:01 What is Spring?

[@Srijan_04]

So far, This is the best ever resource for understanding java which I have seen. This guy Ishant does magic and everything gets into the brain xD. Thanks a lot, Edureka and Ishant

[@VEMPARALATEJABEC]

So practical and cleanly explained this is what you need when you want to implant a concept in your mind.Haven’t found a better tutor so far in youtube

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[@meghagupta6994]

This session was too good and helpful... Thank you very much for this effort this really means a lot to us n i really enjoyed n learned things more clearly...

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Thank you for appreciating our efforts. We are glad the video was of great help to you. Do subscribe to our channel and stay connected with us. Cheers :)

[@rohanbattula5233]

This video is amazing, one of the best java videos ive seen on youtube.

[@danielplainview2360]

Excellent analysis. Very well articulated and easy to follow.

[@edurekaIN]

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[@vinithmahendran235]

Excellent video... Java simplified😄👌🏻

[@DonAngelo333]

God bless you for your video and explainations! I am studying 2 hours before the interview. It's going to be fun!

[@edurekaIN]

Thank you so much for the review ,we appreciate your efforts : ) We are glad that you have enjoyed your learning experience with us .Thank You for being a part of our Edureka team : ) Do subscribe the channel for more updates : ) Hit the bell icon to never miss an update from our channel : )

[@mokshadanayak9182]

Very informative video and nicely explained.Very well done.Thank you so much for sharing with us.

[@edurekaIN]

Hey Mokshada, thank you for watching our video. Do subscribe, like and share to stay connected with us. Cheers :)

[@iti_pooja22]

A very useful Video to prepare for Java interview. Thank You for the Video!!!!

[@LizardanNet]

Thanks for this. Java interview tomorrow.

[@edurekaIN]

+Lizardan, thanks for checking out our tutorial. Hope your interview went well. :) Do subscribe to stay posted on our upcoming tutorials. Cheers!

[@thatsdeep7058]

I am in love with this teacher/ Instructor !!!!!!!!!!!!!! 😍❤❤

[@edurekaIN]

Happy to hear that! Keep learning with us...

[@ravindrasarode6752]

Wonderful video to solve my basic concepts here, thank you so much eureka is a good platform for learning.

[@chat3min]

Best revision video for Java OOPS and other basic questions before your onsite interview. Thank you.

[@edurekaIN]

Hey Somal, thank you for appreciating our work. Do subscribe an stay connected with us. Cheers :)

[@ianiketjain]

Beautifully Explained sir !!!

[@edurekaIN]

Thanks and welcome

[@sergiucodes]

I gotta be honest I was distrusting at start for some reason (mostly because of the date created being 2017) but once this guy started talking, holly!!! Thanks so much for this tutorial, amazing!

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[@amirkhan3633]

Very helpful...session was too good : )...Covers whole Java(Core+Adv).

[@edurekaIN]

We are very glad to hear that your a learning well with our contents :) continue to learn with us and don't forget to subscribe our channel so that you don't miss any updates !

[@devandeva4374]

thanks man im from c++ backgroud but got placed in bajaj finserv which only needs java after watching this video a day before interview

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[@bibekroy1318]

This was simply awesome.. looking forward to see more videos from you...

[@edurekaIN]

Thank you so much : ) We are glad to be a part of your learning journey. Do subscribe the channel for more updates : ) Hit the bell icon to never miss an update from our channel : )

[@Sapvision01]

One of the best explanation over this channel thanks for sharing your knowledge with us god bless you.....

[@edurekaIN]

You're welcome 😊 Stay connected with our channel and team :) . Do subscribe the channel for more updates : ) Hit the bell icon to never miss an update from our channel : )

[@sujanabandari35]

Thank you very much for sharing such an amazing interview questions to us.Very helpful those who are seriously trying for interviews.

[@edurekaIN]

Hi : ) We really are glad to hear this ! Truly feels good that our team is delivering and making your learning easier :) Keep learning with us .Stay connected with our channel and team :) . Do subscribe the channel for more updates : ) Hit the bell icon to never miss an update from our channel : )

[@noothivinun8204]

Perfect video to recall and learn all the JAVA concepts

[@abhidynmc]

Thank you for the valuable questions. I feel more confident!

[@edurekaIN]

Hey Abhishek, we are glad to have helped you. Do subscribe and stay connected with us. Cheers :)

[@ltmikepick]

Awesome! I subscribed because you helped me to understand and remember java concepts

[@rehanarazviya5036]

Informative video thank you edureka

[@edurekaIN]

We are very glad to hear that your a learning well with our contents :) continue to learn with us and don't forget to subscribe our channel so that you don't miss any updates !

[@bakchodhutiyapa8298]

i like this channel a lot !! regula viewr ! congrats keep it up!

[@preethij5931]

Can't describe in words how good this tutorial is.thank you so much for the effort

[@krishnaverma7744]

Thanks for sharing the the video, its really helpful. Many thanks....

[@NoThisIsntMyChannel]

Great explanation sir, cheers from Brazil

[@edurekaIN]

Thank You 😊 Glad it was helpful!!

[@taz6626]

Hello! It is more than perfectly explained everything! Thank you!

[@edurekaIN]

Thank you for watching our video. Do subscribe, like and share to stay connected with us. Cheers :)

[@kamalgarg6313]

Thank you so much for amazing videos. Could you also please make videos on system design interview questions in Java like 1) Design a traffic control system 2) Design a elevator system 3) Design a parking lot system etc.

[@MrSampathmca]

very superb video.. i have enjoyed so much...

[@anniek7259]

Very interesting edureka blog.. I understood alot which i don't know.. Thank you team..

[@edurekaIN]

Thanks for the compliment, Annie. We are glad that our video was of great help to you. Do subscribe to our channel and stay connected with us. Cheers!

[@फूलेदस्तक]

I would like to give a lots of thanks

[@rakesh7105]

object of an abstract class can not be created even in run time. The constructor in abstract class is to initialize the fields.

[@subashchokkalingam6312]

Really Great....!!!

[@mohammedsufi4649]

Very Very useful video. Hats off to edureka. Please keep up your great work

[@edurekaIN]

Hey Mohammed, thank you for watching our video and appreciating our efforts. Your words is our motivation. Cheers :)

[@leomonz]

very nice video and easy organized and clear...

[@tubepankajyou]

Awesome collection of questions. Thanks you very much.

[@edurekaIN]

Thank you so much : ) We are glad to be a part of your learning journey. Do subscribe the channel for more updates : ) Hit the bell icon to never miss an update from our channel : )

[@mahaboobvali7018]

Vedio is good. I think there is need for small change at 30:40 .You have mentioned about Heap in Stack and vice versa

[@anuraggwl]

Very Informative .. Please have a separate video for Spring and Hibernate

[@edurekaIN]

Hey Anurag, thanks for checking out our tutorial. Here's the link to our Spring interview questions tutorial: kzbin.info/www/bejne/r3-8aXuCoJabhK8 We do not have an interview questions tutorial for Hibernate, but perhaps these videos will help you prepare: kzbin.info/aero/PL9ooVrP1hQOGddZSIsq4d0nhZDMZlPY1X. Hope this helps. Cheers!

[@vijayalakshmi6028]

I have a question about question 18. Why par.foo() is "I am foo in super"?. par is a reference object of "parent" class which is pointing to "child" class, right? then par.foo() should give : - I am foo in child ....

[@edurekaIN]

Hey Vijaya, "It is still refering the parent class method because it is a static method and static methods can't be overridden." Hope this helps!

[@maranvetry3877]

Easy to understand the logic

[@b.vishnuvardhan3704]

Awesome explanation hoping more videos

[@edurekaIN]

Good To know our videos are helping you learn better :) Stay connected with us and keep learning ! Do subscribe the channel for more updates : )

[@shiv12592]

great work..edurekha.., plz upload vidios for android and mysql interview purpose.

[@edurekaIN]

Hey Shiv, glad you loved the video. Do subscribe to never miss an update from us in the future. We will surely process your request as soon as possible. Cheers!

[@alittlecoding]

Thank you very much. Best video

[@keshavkuruva2581]

Flow of explanation is very clear tqqq for video ....

[@aishgk0912]

Thank you so much, edureka! for uploading this video. This is so helpful for interview preparations. All the other videos breaking down the basic concepts of Java were also excellent.

[@bhartirajpal5402]

Very useful video. Every Concept is explained very clearly.

[@bhaveshmurug1548]

Nice Video Edureka keep it up n thanks for easy way to help us .

[@edurekaIN]

Thank you for watching our video. Do subscribe, like and share to stay connected with us. Cheers :)

[@kanaparthysaiteja5589]

WONDERFUL SIR TRULY ENJOYED AND LEARNED ALOT IN SIMPLE, CLARITY AND EFFECTIVE MANNER. THANKS

[@ehsansasanian9653]

so far ... the best video of recapping important concepts in java, well done Thank You!

[@hippiestafarii]

Hi !!! Very helpful video, tks a lot :-)

[@edurekaIN]

Thank you for watching our videos and appreciating our work. Do subscribe to our channel and stay connected with us. Cheers :)

[@iamkaziADroidMan]

This guy is legendary due to his dedication for it❤️ kudos!!!

[@edurekaIN]

We are very glad to hear that your a learning well with our contents :) continue to learn with us and don't forget to subscribe our channel so that you don't miss any updates !

[@anandsinghnaruka5175]

Hey ishant ..u have very well explained ...thank you

[@alsan8935]

Great great work by ishant..🙌🙌🙌. Good job guys. It’s big help for fresher and java community...Thanks

[@shubhamsoni8093]

Thanks. This was the best way to learn before a viwa

[@aashaykadu3390]

Thank you edureka . I'm placed.

[@edurekaIN]

You're welcome 😊 Stay connected with our channel and team :) . Do subscribe the channel for more updates : ) Hit the bell icon to never miss an update from our channel : )

[@vidyabukitgar]

While explaining that Strings are not mutable, why the compiler didn't throw any error when you tried to concatenate it with str.concatenate("hi... ") ???

[@edurekaIN]

What we mean by immutable is that you cannot change specific terms in the string. For example, 'Hello' is the string. You cannot change the string to 'Wello' by any case as that is not allowed. Whereas concatenation is allowed because the original string plus some other string is taken. Hope that solves your query.

[@vidyabukitgar]

@@edurekaIN yes it did

[@johnjames6717]

Hello. Thank you for this video. I learned a lot.

[@bharatranpariya5581]

very nice, better then many of the articles. good job.

[@edurekaIN]

Hey Bharat, thank you for watching our video. Do subscribe, like and share to stay connected with us. Cheers :)

[@ShubhamSharma-ni1nj]

Thank you so much ☺ I had a wonderful time 🙋

[@mohitvalechay]

Thanks for putting together these questions together..thank you

[@vivekkumar-nw1qv]

Congratulations for 1M 💐💐💐

[@divyap3295]

Ishan ur awesome ..... really explained very well...TQ

[@ridhisharma6062]

thank you for this. I am working in mainframe but wish to switch in Java. what will I require to do that

[@edurekaIN]

Hey Ridhi, thanks for checking out our tutorial! As a mainframe developer you would some idea about programming. You can learn Java if that's the career track you are interested in. You can check out our Java course that is designed to give you hands-on experience: www.edureka.co/java-j2ee-soa-training. You will also get to work on a project towards the end of the course. The pre-requisites to learn Java are prior programming experience and familiarity with basic concepts such as variables/scopes, flow-control, and functions. Prior exposure to object-oriented programming concepts is not required, but definitely beneficial. Hope this helps. Cheers

[@chandushetty6065]

very use full. Thank you so much...........

[@kajalkoravi4092]

very useful and informative video ,i got to learn much more while preparing for questions ,thank you for this video

[@edurekaIN]

Hey Kajal! We are delighted to know that you liked our content. Subscribe, like and share to stay connected with us. Cheers :)

[@DonCachuela22]

Thanks for this!

[@nanajijonnadula6290]

Very good effort. Very good material. the best trainer i have ever. He is the best.

[@edurekaIN]

Thanks for the compliment! We are glad you loved the video. Do subscribe to the channel and hit the bell icon to never miss an update from us in the future. Cheers!

[@danillolf]

Thank you so much for your content! Regards from Brazil!

[@edurekaIN]

Thank you so much : ) We are glad to be a part of your learning journey. Do subscribe the channel for more updates : ) Hit the bell icon to never miss an update from our channel : )

[@otherworks2085]

WOW its very helpful ! plz upload more or part TWO plz

[@edurekaIN]

+Otherworks, thanks for checking out our tutorial. We're glad you liked it. Here's the link to our Java playlist: kzbin.info/aero/PL9ooVrP1hQOHb4bxoHauWVwNg4FweDItZ. Hope this helps. Cheers!

[@hippiestafarii]

Yes !!! Very nice video, thanks a lot :-)

[@baloney_sandwich]

dam good high quality video, must view for all java learners be it entry or advanced level

[@edurekaIN]

Hi : ) We really are glad to hear this ! Truly feels good that our team is delivering and making your learning easier :) Keep learning with us .Stay connected with our channel and team :) . Do subscribe the channel for more updates : ) Hit the bell icon to never miss an update from our channel : )

[@jhariasaurabh75]

Thanks for the video

[@FurqanHussain8888]

Sir your explaining way is Awesome.

[@edurekaIN]

Thank You 🥰

[@shaiksahil1039]

can you give me a reply about the real time examples(technically related) of encapsulation, inheritance, polymorphism, and abstraction?...its being asked in interviews....can you please reply to this question

[@everyonecancode1613]

Awesome !

[@charchilgupta]

Very helpful ....Thanks a lot

[@prajaktathorat2597]

its really superb👍

[@edurekaIN]

Thank you! Cheers!

[@abhrajitnandy]

In abstract class, how to call non abstract method from child class if abstract class doesn't allow us to create object?

[@edurekaIN]

Hi Abhra, It's possible to have non abstract methods in abstract class. When you want to prevent instantiation of the superclass. Child classes can use or override the public and protected non-abstract methods defined in the abstract class.

[@Dishasareen_]

Bless you! Such Clarity!!

[@edurekaIN]

Hey Disha! Thanks for the compliment. We are glad you loved the video. Do subscribe to the channel and hit the bell icon to never miss an update from us in the future. Cheers!

[@jayant2716]

You are Genius Sir...

[@edurekaIN]

Hey Jayant, thank you for appreciating our trainers. Do subscribe and stay connected with us. Cheers :)

[@sreerupakatamoni3087]

Thank you for this vedio.this is really help full.can u plz share the slides sir

[@deepakmeher9913]

Nice ans helpfull.Thank

[@chakidan]

Thank you. Excellent Job. Very helpful and was a quick ramp up i could not have found anywhere else.

[@edurekaIN]

Hey Charaka, thanks for checking out our tutorial! We're glad you found it useful. Do subscribe to our channel to stay posted on upcoming videos. Cheers!

[@sauravmastiviedo8888]

Nice video Sir 🙏🙏

[@edurekaIN]

Thanks and welcome

[@kpkp2541]

thankyou so much for such a superb class ..............

[@edurekaIN]

We are glad to help :) Do subscribe and stay connected with us!

[@satishram1808]

hai sir we r very lucky have this session very help full sir

[@JitendraKumar-lt8fl]

Thank you very much

[@edurekaIN]

You are welcome :)

[@georgevisan973]

Great job! Thanks!

[@sujithagurumurthy2116]

Thank you. Appreciate your work

[@edurekaIN]

Hey Sujitha, we appreciate you finding time and going through our video. Do subscribe and stay connected with us. Cheers :)

[@StudentTechnique]

thanks for this interview video.

[@edurekaIN]

Thank you so much : ) We are glad to be a part of your learning journey. Do subscribe the channel for more updates : ) Hit the bell icon to never miss an update from our channel : )

[@Calexander_Canada]

Thankyou I really enjoyed your video :)

[@edurekaIN]

We are super happy that Edureka is helping you learn better. Your support means a lot to us and it motivated us to create even better learning content and courses experience for you . Do subscribe the channel for more updates : ) Hit the bell icon to never miss an update from our channel : )

[@Live_Love_Ride]

Equals() method can be explained in better way. Both for Object class and string class :)

[@edurekaIN]

Hey Aashutosh, thank you for the feedback! We will definitely work on this. Hoping to see you on our channel learning with us. Cheers :)

[@aayushpatel3360]

Classy explanation

[@edurekaIN]

Hi : ) We really are glad to hear this ! Truly feels good that our team is delivering and making your learning easier :) Keep learning with us .Stay connected with our channel and team :) . Do subscribe the channel for more updates : ) Hit the bell icon to never miss an update from our channel : )

[@meherkhan933]

Top class man! Thanks

[@edurekaIN]

Thank you for watching our video. Do subscribe, like and share to stay connected with us. Cheers :)

[@TheMacgari]

Its really great!

[@ditu-kunalsarda6863]

Such beautiful concepts compiled together. Thankyou! The perfect revision