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.
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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.

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Thanks Rohit 🙂👍

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

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Thanks 😊
Probably the best video on Java 8 new features.
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[@kiranmaiganadi4296]

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I know Avinash.M just sharing my experience 🙂🙂

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Legendary talk and good examples

[@abrahammoyo3457]

Eager for part 2 and 3

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Thanks

[@CodeDecode]

Sure will upload soon

[@mayurshetye7301]

Thanks, This was very helpful !

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very useful, thx!

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😇😇👍👍

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Amazing explanation and great effort!

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You're welcome fatima

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Very nice explaination

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Thanks for the videos. please upload 2nd part

[@CodeDecode]

Sure will upload soon 👍

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Please make tutorial on java 8..you are explaining concepts in questions very well. Wanted to know in detail through tutorial

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❤️

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Superb

[@CodeDecode]

thanks

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

[@CodeDecode]

Sure 👍

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Best explaination of java 8 features I ever seen. Thank you so much. More clear now

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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. 👍

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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
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Thank you so much for such a nice video, will be waiting for the upcoming video✌️✌️

[@CodeDecode]

sure I will upload soon

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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.

[@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 👍👍

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Thanks a lot , it was very informative.

[@CodeDecode]

Thanks 👍

[@pavandattadatta3156]

Thank alot madam.....jee

[@CodeDecode]

Thanks Pavan 🙂👍