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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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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[@CodeDecode]

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

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

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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 🙂👍

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[@CodeDecode]

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[@CodeDecode]

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[@CodeDecode]

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[@raghunathgurram]

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[@CodeDecode]

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[@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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[@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]

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[@akashhivre6566]

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[@damanraaj3496]

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

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❤️

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really thank full to this channel very helpful

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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 👍👍

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Thanks Parth 🙂🙂👍👍

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Nice video mam Easy to understand

[@CodeDecode]

You're welcome

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very nice detailed expl, thanks

[@CodeDecode]

you're welcome

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Wonderful Explanation. Keep rocking. Crystal clear.

[@CodeDecode]

Thanks 🙂🙂

[@shivamshah431]

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

[@CodeDecode]

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Here you go Yash kzbin.info/aero/PLyHJZXNdCXsdeusn4OM33415DCMQ6sUKy

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Thank you so much

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This is super helpful..Thank You

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Thanks Asim 🙂🙂

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You are extremely good. These videos are helping us to understand basic concepts. A big thank you to you and your team. Request you to make videos on multithreading, microservices, sql querries interview questions.

[@CodeDecode]

Sure next video will be on few of your topics 👍

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[@CodeDecode]

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Awesome video. Thanks for making these videos.

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its really usefull need more videos like this madam

[@CodeDecode]

Sure will upload soon 👍👍

[@shailajaranga6790]

Super explanation 👌👌👌

[@CodeDecode]

Thanks

[@abhijeetbagde1597]

Thank you so much Mam!

[@CodeDecode]

🙂 no problem Abhijeet 👍👍

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Thank you mam for simplifying concept with wonderful explanation....

[@CodeDecode]

Thanks for the nice words 👍

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Thank you so much... This is really helpfull for interview. Egarly waiting for the second part...

[@CodeDecode]

Will upload soon 👍

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

[@CodeDecode]

Thanks 🙏🙂👍👍

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Big fan of this channel.. Excellent videos in simple language!! Thanks

[@CodeDecode]

Thanks for the nice words ......

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Awesome explanation really simple and precise explanation .

[@CodeDecode]

Thanks👍

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

[@CodeDecode]

Thanks Pavan 👍🙂

[@venkatbongi1945]

Thanks alot explanation is super

[@CodeDecode]

Thanks Venkat 👍🙂

[@deepard24]

Thanks for such a details explanation. Video is very helpful

[@CodeDecode]

Thanks👍

[@electrify9447]

Should method reference only use static methods?, or normal methods are also allowed

[@CodeDecode]

Both are allowed

[@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

[@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 👍👍

[@priyagade971]

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

[@CodeDecode]

Sure 👍

[@sanchitshrivastava3402]

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.

[@RishiRaj-ex9wb]

Great work. Thanks.

[@CodeDecode]

Thanks Rishi 🙂👍

[@belaidbouaoualten3899]

what a nice tutorial I like it really like the way of combining the concept and the coding thank you so much for your time and effort.

[@CodeDecode]

Thanks belaid for the nice words

[@jagdishkate5880]

Thank you ma'am for such beautiful videos

[@CodeDecode]

Welcome :-)

[@kiranbele7219]

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

[@CodeDecode]

Thanks. Sure will upload soon

[@sheuleeraha6714]

NEED 2ND PART! GIVE ME 2ND PART!! I WANT TO LEARN ABOUT OPTIONAL. METHOD REFERENCE IS EASY IF WE REFER TO CLASS AND METHOD FOR EXISTING IMPLEMENTATION, U TEACH WELL. I WANT MORE

[@CodeDecode]

Sure will upload soon 👍

[@kunal4350]

@@CodeDecode is 2nd part came?

[@Indianuser77]

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

[@CodeDecode]

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

[@mouryas4671]

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

[@CodeDecode]

Sure 👍

[@aaaaaaaa3811]

really very nice explanation....thanks for u r efforts....👌👌

[@CodeDecode]

You're Welcome...

[@ritikagandhe1688]

Very nice explanation..please make other video as well ..need explanation on stream..hope you can help

[@CodeDecode]

Sure will cover streams in next video. 👍

[@uj-channel]

1.Java 8 helps us escape imperative style of coding. 2. Not many are aware of the diamond problem we had with interface in java 1.7 and how we overcome that in java 1.8. 3. Theres an improvisation done to hashmap when the collision happens and when it reaches the threshold theres no linkedlist doing the management for the same keys its the balanced tree.

[@Prakash-gz6py]

Thanks for video. Please set slides to full screen after minimising them, can’t watch them properly on small screen.

[@CodeDecode]

Nice suggestion. Will take care of this from next time.

[@manojpandey6661]

Good job ..keep going ...

[@CodeDecode]

Thanks 👍

[@bhagyalaxmipatsariya3408]

Hi, Please make a video of Java 8 tutorials for basics.. Thank you in advance You are doing great work ,, these videos helped me a lot to understand the basics.

[@josephnairpudupermanil8679]

Really nice and cool explanation. Nice information keep it up.

[@CodeDecode]

Thanks Joseph 🙂👍

[@ram-ky9ur]

Appreciate the quality content and the effort you put in, I suggested to my colleagues as well. Organizing into playlist would help users and also the channel gain more users for sure.

[@CodeDecode]

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

[@yoshitamahajan353]

Hi what is meaning functional programming in java?

[@gudavallisivakumar493]

Hi Madam, Please create a complete video on java 8 features along with pre-defined functional interfaces.

[@CodeDecode]

kzbin.info/aero/PLyHJZXNdCXsdeusn4OM33415DCMQ6sUKy

[@nagalakshmikesavan9198]

Hi, Your all videos Are clearly explained!! Thank you soo much for your effort!! Please make a video on serialization and deserialization !!

[@CodeDecode]

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

[@VETRI.90]

amazing tutorial 👏

[@CodeDecode]

Thanks Vetri 🙂👍

[@nivedaravi2241]

Thanks for the videos. please upload 2nd part

[@CodeDecode]

Sure will upload soon 👍

[@SriHariChukka1210]

nice explanation dear. 👏

[@CodeDecode]

Thanks Srihari 🙂👍

[@retheeshrr3368]

Simply awesome tutorial. Nice demo 👍

[@CodeDecode]

Thanks Retheesh 🙂👍

[@afifkhaja]

This is so helpful!

[@CodeDecode]

Thanks