Map Vs Flat Map | Top Java 8 Coding Interview Question and Answers | Code Decode | Java 8 features

In this video of map vs flatmap we have covered top java 8 coding interview questions for experienced along with answers i.e Map vs flatmap
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In this video of java 8 interview question and answer of code decode we have explained the difference between map and flatmap
map vs flatmap is a very important questions in terms of java 8 interview questions and answers for experienced and freshers
map vs flatmap comes under top java 8 interview questions and answers
we have also explained the internal working of flatmap
How Map works in Java 8
The Stream.map() function performs map functional operation i.e. it takes a Stream and transforms it to another new Stream.
It applies a function on each element of Stream and stores return value into new Stream.
The map operation takes a Function, which is called for each value in the input stream and produces one result value, which is sent to the output stream.
How Flat Map works in java 8
Is the combination of a map and a flat operation
This means you first apply the map function and then flattens the result.
The key difference is the function used by map operation returns a Stream of values or a list of values rather than a single value, that's why we need flattening. When you flat a Stream of Stream, it gets converted into Stream of values.
To understand what flattening a stream consists in, consider a structure like [ [1,2,3],[4,5,6],[7,8,9] ] which has "two levels". It's basically a big List containing three more List. Flattening this means transforming it in a "one level" structure e.g. [ 1,2,3,4,5,6,7,8,9 ] i.e. just one list.
In short,
Before flattening - Stream of List of Integer
After flattening - Stream of Integer
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[@lakshmipg6458]

Hi, Thank you so much for the Java8 videos. This helped a lot to crack my interviews. Also can you please do video on how to resolve memory leak issues in java as it was the most commonly asked question in managerial round.

[@saumilvachheta]

Hi, don't add video suggestion boxes appear at the end of the video. Sometimes, it affects the material / code, which is being shown on the screen. It ruins the thing (course material). If you want, you add them with (i) symbol at the top right corner. Thanks.

[@GauravSharma-up9gs]

I thought learning Java 8 will be difficult but I played your playlist & that's it. Thanks for sharing your knowledge with everyone in simplified manner. God Bless :-)

[@CodeDecode]

Thanks a ton Gaurav 🙂👍

[@shivamagarwal2327]

Great and simple explanation of a complex concept. Hats off.

[@CodeDecode]

Thanks Shivam 🙂🙂

[@PankajKumar-ej5dt]

Best programming related Channel ever.

[@CodeDecode]

Thanks 😊👍

[@VikasKumar-uk9sk]

Thanks for making Java8 easy for all of us . Awesome explanaition 👍

[@CodeDecode]

Thanks Vikas 😊😊

[@g.prakashreddy5647]

Superb explanation of java8 concepts, Keep continuing

[@CodeDecode]

Thanks 🙂👍

[@RishiRaj-ex9wb]

I have been sharing your videos bcoz these are so great! Thanks.

[@CodeDecode]

Thanks a ton Rishi 🙂👍👍🙂

[@TheShantanu30]

Best explaination ever given. Thanks

[@CodeDecode]

thanks shantanu

[@MrAsgar123]

Thank you so much for your explanation.

[@CodeDecode]

Thanks Asgar 🙂👍

[@sanalsz]

So you are collecting it as a set and thats the reason for getting unique values as result right? Not because you use flatmap. When flatmap is used, we'd get a single list, but with all the values including duplicates?

[@7thwik]

You are a precious gem !! I feel more confident now to give interviews.

[@CodeDecode]

Thanks a lot Satwik 🙂🙂. All the very best for your interviews Man 👍👍keep learning keep growing 🙂🙂

[@pankajdogra6796]

Thanks a lot for detailed explaination.

[@CodeDecode]

😊😊👍

[@dpkpk1573]

Nice example taken for explanation...

[@CodeDecode]

Thanks

[@minusmagic5660]

Hello mam. I have 8 months of experience. Superb explanation of all the concepts I have been following your videos and I am more confident in the interviews but recently I faced very difficulty in project questions ( end to end spring Boot application ). I struggled to answer the interviews so can u start a new video series for interview questions on the project.

[@CodeDecode]

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[@4everlove87]

Great explanation

[@CodeDecode]

Thanks

[@DarnProud]

it's really helpful....Thanks

[@CodeDecode]

You're welcome tushar

[@Vithal_Nivargi]

Thank you 😊it was nice explained

[@CodeDecode]

Thanks Vithal 😊👍

[@KarthikSekar-rk8ly]

Flight sound in background 🤩

[@CodeDecode]

Yeah we have an airport near by😊

[@AndhrakidZ]

Thank You ..

[@CodeDecode]

🙂👍

[@VETRI.90]

Lovely explanation 👌

[@CodeDecode]

Thanks Vetri 🙂👍

[@praveenkumarvarkala]

Best explanation.

[@CodeDecode]

Thanks Praveen 🙂👍

[@PANKAJKUMARSINGH673]

💪 Great explained

[@CodeDecode]

Thanks pankaj

[@rutujagurnule6833]

Can you also make vedio on oauth authentication in spring boot ,csrf,sql injection attacks ?

[@unemployedcse3514]

awesome ❤

[@CodeDecode]

Thanks

[@karthiksundaram544]

Superb demos

[@CodeDecode]

Thanks Karthik 🙂👍

[@manognajoshik8465]

Ma'am can u please create a video on Remote method invocation? I have gone through many channels but haven't been successful in understanding it..seeing the way you explain, I am pretty much hopeful you can teach it quite well. Please 🥺

[@CodeDecode]

🙂 sure we will put this in pipeline then 🙂👍

[@villagevibess6602]

Nice explanation madam.. can you please do one video about spring boot get the MySQL table data without model clas.

[@CodeDecode]

Sure 👍

[@maheshgm1251]

Super

[@CodeDecode]

Thanks

[@siddharthshinde9630]

Awesome 😎

[@CodeDecode]

Thanks Siddhart 🙂👍

[@Chenga-bt6tx]

If u explain little bit slowly Then concept will understand. Anyways u did great

[@PankajKumar-ej5dt]

Believe me slowly will confuse you more. Better to explain it as it is like she's doing.

[@thesologuy14]

Why can't we use .distinct() for duplicate value?

[@hasitgotanymeaning2562]

Hi ma'am, can you pls share all your ppt's or docs ?

[@modern_mirror]

Can you please make a video on @bean in details in spring or spring boot..

[@CodeDecode]

sure we will create it soon

[@RishiRaj-ex9wb]

Good day.!

[@CodeDecode]

You too 🙂👍

[@manindersingh6371]

I think in this video, speed is little bit fast. Not easy to concentrate on the topic. Before upto this video everything was awesome. It's just an enhancement not a bug

[@CodeDecode]

Sure we will reduce our pace Maninder. Sorry for inconvenience . We will work on our pace 👍🙂

[@manojpatil2457]

Can you please cover JPA?

[@CodeDecode]

sure we will create video on it soon

[@welcome2sumit]

Can we apply map and flatmap to Map. Suppose I have Map of Map what will be output by flatmap?

[@CodeDecode]

You can apply flat map on values of map. If u want , we can share code on github for the same.

[@hariprasad2697]

U r faster than JVM can you please explain slowly 😑

[@CodeDecode]

Sure Hari, we will work on that👍🙂

[@andytube07]

😂😂

[@SIVAPD]

wonder how it worked with out constructor ??

[@CodeDecode]

Try once Siva. If doesn't work please share your doubt, issue after u tried it yourself. I would be happy to help you Man 👍👍🙂

[@Ravikumar-gj6qw]

dont open yaah! WFH is the best to stay safe

[@CodeDecode]

😂

[@rajashreejayasingh1652]

Why channels with nice content have terrible voices.

[@CodeDecode]

Can you please tell us what's wrong with voice ?

[@anupBroLogs]

Hi i am technical recruiter. I Wana collaborate if u interested to have live mock java fullstack / backend developer role interview session.

[@CodeDecode]

Sure Anup. Pleased connect at [e-mail]