Java 8 new features || Java 8 Interview Questions and Answers ( Live Demo with Examples )

In this video, you'll learn about Java 8 new features and Java 8 Interview questions and answers and explanations with live demo and working examples
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Java 8 Interview Questions Complete Playlist :
• Java 8 Interview Quest...
There are lots of new features which were added in Java 8. Here is the list of important features which are mostly asked as java 8 interview questions:
Lambda Expression
Stream API
Default methods in the interface
Functional Interface
Optional
Method references
Date API
Nashorn, JavaScript Engine
Main advantages of using Java 8?
More compact code
Less boilerplate code
More readable and reusable code
More testable code
Parallel operations
Interview question on java 8 Lambda expressions is a very commonly asked question :
Lambda expression is an anonymous function ( without name, return type and access modifier and having one lambda symbol )
Functional interfaces are those interfaces which can have only one abstract method .
It can have static method, default methods.
There are many functional interfaces already present in java such as eg : Comparable, Runnable
How lambda expression and functional interfaces are related?
Lambda expressions can only be applied to abstract method of functional interface.
As we know Functional interface is an interface with Exactly One Single Abstract method and can have multiple Static or default methods.
To create our own Functional interface, You can do following steps:
Create An interface
Annotate that with @FunctionalInterface.
Define exactly one Abstract method.
There is no restriction on number of static and default methods defined in such and interface.
Java can implicitly identify functional interface but still you can also annotate it with @FunctionalInterface . It just give you the security that in case if u by mistake add 2 abstract methods then Compiler will throw compile time error.
Method Reference :
EG : MethodReferenceDemo and FunctionalInterfaceDemo
Method reference is replacement of lambda expressions. It is used to refer method of Functional interface to an existing method. Mainly it is used for code reusability.
Functional Interface’s Abstract method can be mapped to specific existing method using double colon operator (::) . This is Method reference.
Hence Method reference is an alternative to Lambda expressions.
Whenever we have existing Implementation of Abstract method of our Functional interface then we can go for method reference. If no such method like testImplementation() is available then go for lambda expressions.
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[@navy4315]

Top Notch Videos...Showing Implementation along with the presentation is the best thing I like about your videos.

[@CodeDecode]

Yeah it's important to understand how to implement too 😊

[@neelabhrai231]

you guys helped me a lot in my interviews . Never ever stop this . Its gold

[@ishantsharmaa]

Hi Mam
I have cracked interview with respected service company and your videos are really helped me lot.
Thanks you so much.

[@CodeDecode]

Many congratulations Karthik. 🎊🎊🎊🎊 keep learning keep growing 👏👏👏👏

[@sunnyjain630]

Thanks 😊
Probably the best video on Java 8 new features.
Perfectly explained each and everything with excellent communication skills 👏.
YOU ARE A GEM TRAINER 💎

[@anusathiya8887]

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[@CodeDecode]

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[@rohitsharma-xt8qe]

Form 18:14 to 18:39. the moment when I can't resist hitting the like button :) nicely explained Method reference.

[@CodeDecode]

Thanks Rohit 🙂👍

[@sreeharir1029]

This video is very helpful to brush-up the Java 8 features. Kudos to the instructor and team, very simple and good presenation.

[@CodeDecode]

Thanks Sreehari 🙂👍

[@venkatesha6378]

I want to see the picture of a great lady who explains these videos very clearly. give big applause

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Thanks Venkatesh. We are same people like you Man. Just with some little IT experience. Will be Glad to connect with you any time 👍.

[@venkatesha6378]

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[@CodeDecode]

😊😊

[@kiranmaiganadi4296]

Thank you so much for explaining the difference between Lambda & method reference clearly, i was waiting for this type of explanation for so long. thank you :)

[@CodeDecode]

We are glad that it helps 👍👍 thanks for writing back to us Kiranmai 🙏🙏

[@samsonrj5628]

Thanks for sharing the knowledge with millions around the globe. I am really impressed with your way of teaching and knowledge on the subject. Detailed explanations and straight to the point, and with practical examples/implementations. I have watched all the videos in this playlist and learned so many new concepts.

[@CodeDecode]

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[@palanesami]

Thank you so much for giving these concepts easily in hand. Finally today I understood method reference which was never clear before .

[@CodeDecode]

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Ma'm i would really like to thank you from the bottom of my heart .This is increasingly helping me in gaining my confidence for the interview. Please keep uploading .

[@CodeDecode]

Sure Shubham. 👍👍 Thanks for the motivation. These comments helps us in keep posting more videos 👍 thanks 🙏

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I would like to thank for the amazing work of yours and it would be so helpful if you have added a video only on the java 8 features involving the implementation for predicate biconsumer and all other with detailed explanation.
Thanks....!!!

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Sure kalyan we will add java 8 coding videos soon....

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[@pradeepkumar-zp1mv]

No words...Covered much with clear explanation in less time

[@CodeDecode]

Thanks Pradeep 🙂👍

[@paulacobzaru]

A very good tutorial about Lamda expressions!!! I couldn't understand them till this video! Please provide a special video for the functional interfaces!! Thanks! Good luck! :)

[@CodeDecode]

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👍👍

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[@CodeDecode]

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[@dhirajchand3659]

Without Bioconsumer functional interface this will not print the values of a and b? Means we have to use everytime when we are dealing with lambda functions

[@RuhulAmin-hu9qy]

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This is really helpfull for interview.
Egarly waiting for the second part...

[@CodeDecode]

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[@akshkaur8001]

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[@CodeDecode]

Thanks Aksh 👍👍

[@rohitsharma-xt8qe]

Hello, what is the use of the introduction of default and static methods in functional interface in java 8? Can you explain it with an example?

[@deepikaganesh8434]

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[@CodeDecode]

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wow....very good explanation with practical examples for Most Frequently asked Java 8 interview topics...Thanks for creating such a innovative video...its really helpful!!!

[@CodeDecode]

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[@CodeDecode]

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[@RAJESHKUMAR-lz4re]

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very nicely explained with demo...clearly understood without referring any other links

[@CodeDecode]

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[@CodeDecode]

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[@CodeDecode]

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Recently had an interview...
And you know most of your videos covers the question he asked me..

[@CodeDecode]

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[@shauryabavishi3874]

The video is super helpful! Can you please provide slides, for reference? Thanks.

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[@CodeDecode]

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Hi, Please make a video of Java 8 tutorials for basics.. Thank you in advance
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[@CodeDecode]

Sure 👍👍it's a very nice topic. We will soon make the video on that

[@bhinubhinusha9720]

Do we have static method inside interface pre Java 8 ?

[@umadevi11112]

Thanks alot, you really helped us to revise things quickly

[@CodeDecode]

You're welcome Uma....

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[@CodeDecode]

All the best to you too 👍. Glad to hear from you. Thanks for the nice words.
Happy weekend and Happy Holidays 👍

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@@CodeDecode Thanks, you too!

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Nice content and wonderful presentation.. Thank you so much.
Happy New Year In Adavance

[@CodeDecode]

Thank you. And Happy New Year to you too 🎊

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Please create second part for remaining points..as this video contents are super useful thank you :)

[@CodeDecode]

Thanks. Sure will upload soon

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Thanks Abulaish 🙂👍

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Hello Mam, The video is great.. i just have one doubt.. you have used compareTo() method with Comparator. Is that correct? because as per my knowledge, compareTo() is comparable's method.

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Thank you mam.You explained it very well and many doubts are cleared.

[@CodeDecode]

M glad it did. 🙂. Thanks for writing back to us.

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hello, your videos are amazing. I also advise your videos to my friends.do you prepare someone specifically for an interview? or do you know anyone who provides this service? looking for a tutor about it just for interview?

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Well explained and you have put great efforts. Thanks

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You are an amazing tutor... Thanks for the clear explanation

[@CodeDecode]

Thanks a tonnn 🙂👍

[@Ravikumar-gj6qw]

if creating Lambdademo obj then we can call this methods from outside class for passing values multiple what about Bifunction lambda we cann't reuse rite

[@parthdalvi5855]

Very clear and simple explanation ... thanks a ton for such amazing tutorials..

[@CodeDecode]

Thanks Parth 🙂🙂👍👍

[@TheFuerzaDON]

wich vide do you have the optional explanation?

[@sowmyabhethalam4337]

Hi Firstly Thanks for the video. I have a doubt.
Class Test is not implementing FunctionalInterfaceDemo then how come class Test providing implementation using method reference to FunctionalInterfaceDemo single abstract method?

[@codewalla]

Hi,
Thank you very much for providing these types of videos.

[@CodeDecode]

Thanks Vivek 🙂👍

[@vaibhavnagrale8550]

Ma'am I have a doubt you told that functional interface was introduced in java 8 so when marker interface was introduced? And what is need of both in java?

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Thanks a lot madam for this video ..pls make videos on end to end ..i want to learn more from you 🙏

[@CodeDecode]

Sure I will complete this series soon. 👍

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Thanks for such a details explanation. Video is very helpful

[@CodeDecode]

Thanks👍

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[@CodeDecode]

Agreed Ram. It needs sorting. Thanks for pointing it out

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[@CodeDecode]

Thanks 🙂🙂

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I should have watch this video a day before... I have lost tcs interview today because of this Java 8😔.......thank you for creating this wonderful video explaining all the features of Java 8.

[@CodeDecode]

It's never late Manshad. Keep learning n m sure u will crack your dream company. Don't be disheartened. Some thing good, something big must be preserved for u. All the very best 👍👍🙂🙂

[@ayushraj935]

Thanks a lot, Ma'am for sharing your knowledge. It would be great if you create the cover entire JAVA8 concept.

[@CodeDecode]

Hi, Most of the videos are already created
Please refer to below link :
ua-cam.com/play/PLyHJZXNdCXsdeusn4OM33415DCMQ6sUKy.html

[@manimuttu1]

Good examples with Nice explaination!!
Please share the above ppt also. so that we can refer all the questions at a time.
please keep this videos in a playlist - else we will loose some topics.

[@CodeDecode]

Playlist has already been created please refer below link :
ua-cam.com/video/oUdENE7ljjw/v-deo.html

[@PavanKumar-yj8fu]

Very good lecture learnt a lot. Thank you very much!!

[@CodeDecode]

Thanks Pavan 👍🙂

[@KanikaChaudhary-vc1cu]

very nice ..feeling so grateful watching ur vdos, thanq so much

[@CodeDecode]

❤️

[@user-jv7sg2rd9i]

your video is such a helpful and amazing 😍 and a very clear. can u create a end to end tutorial on java 8 topics. It will help us to gain more knowledge. Very great thanx to u.

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Hi, thanks for very clear explanation, it is useful even for beginners....

[@CodeDecode]

Thanks 🙏🙂👍👍

[@mouryas4671]

your content is really helpful. please make sure to arrange the videos in sequential order.

[@CodeDecode]

Sure 👍

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Very nice explanation, thank you very much.

[@CodeDecode]

Thanks 🙂👍

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Thanks for your detailed explanation. I am requesting you to make complete Java8 features with real time scenarios.

[@CodeDecode]

Here you go Yash
ua-cam.com/play/PLyHJZXNdCXsdeusn4OM33415DCMQ6sUKy.html

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You are great! you teach very well😌🙏🏻 thank you from all of us

[@CodeDecode]

Thanks a lot Sherlin 🙂👍

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you are morveles.thank you so much for valuable information.

[@CodeDecode]

Thanks 🙂👍👍

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Awesome explanation and demo.Really you made it looks simple.....keep teaching and inspiring us.....

[@CodeDecode]

Thank you so much

[@deepavellaichamy-positivev6724]

Very useful. Thank you very much🙏

[@CodeDecode]

Thanks 👍

[@kirankumarkondapally237]

getting error as Test is already defined. I have imported java.util.stream; Anything wrong?

[@mahendranr8934]

Very nice explaination

[@shivamshah431]

Very well explained. Please make a video for Java 8 features, it will be helpful for many of us. Thanks a lot.

[@CodeDecode]

ua-cam.com/play/PLyHJZXNdCXsdeusn4OM33415DCMQ6sUKy.html

[@politikusmihaly8716]

Very good and undertandable video. I like that you are very detailed.

[@CodeDecode]

Thanks 🙏

[@sumitpandey7973]

Please share your link for spring boot second video ..can u please create which contains more detail under spring boot questions and answers

[@shankarpatilsp]

Thank you so much ma'am..its really helpful!!

[@CodeDecode]

thanks 👍👍

[@retheeshrr3368]

Simply awesome tutorial. Nice demo 👍

[@CodeDecode]

Thanks Retheesh 🙂👍

[@bushrashekani]

Mashallah Great !! Please continue this
May god bless you

[@CodeDecode]

Thanks Bushra. 🙂
ua-cam.com/play/PLyHJZXNdCXsdeusn4OM33415DCMQ6sUKy.html

[@almask.m.2355]

Thank u so much mam .....u r really doing the great job ....👍👍

[@CodeDecode]

Thanks for the nice words 👍

[@jagdishkate5880]

Thank you ma'am for such beautiful videos

[@CodeDecode]

Welcome :-)

[@shotx333]

Very helpful, Thanks

[@damanraaj3496]

We can make the add method static. Then object is not needed. Or use dependency injection. Ofc lambda is still shorter

[@nivedaravi2241]

Thanks for the videos. please upload 2nd part

[@CodeDecode]

Sure will upload soon 👍

[@TheExplorer.Stories]

Wooh great , amazing , fabulous , well explained 🥳 Thank you 😌

[@CodeDecode]

Thanks Tushar 🙂👍

[@surajdeshmukh2351]

It's Eureka moment. It's eye opener tutorial. Great great🔥🔥🔥🔥👍👍👍👍👍👍👍👍👍👍🙏🙏🙏🙏🙏🙏

[@CodeDecode]

Thanks Suraj 👍👍🙂🙂

[@priyagade971]

thank you mam...create whole series on this topic

[@CodeDecode]

Sure 👍

[@mks5988]

Awesome explanation really simple and precise explanation .

[@CodeDecode]

Thanks👍

[@yoshitamahajan353]

Hi what is meaning functional programming in java?

[@priyankpatel6644]

Not able to do method refrencing its showing Syntax error, insert "IdentifierOrNew" to complete ReferenceExpression
Syntax error, insert ";" to complete BlockStatements

[@asimpathan2086]

This is super helpful..Thank You

[@CodeDecode]

Thanks Asim 🙂🙂

[@user-nu3ql6vu2g]

Hi,
You will explain very convenient way to understand the topics
can you please give us your time to understand the java 17 features, pls create a video for JAVA 17 Features Tutorial
Waiting...

[@CodeDecode]

Sure 👍👍

[@siddharthshinde9630]

Thanks a lot hats of for your time and effort.
Please make a video on use of Optional and parallel streaming in detail.Big thanks again really counting on your videos.

[@CodeDecode]

Sure Siddharth, we will create video on that soon 👍👍