Top Java 8 Streams API Interview Questions and Answers | Parallel Stream | Code Decode

Stream api in Java 8 is very important in Java 8 and code decode covered all important Java 8 Interview Questions in this video
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Java 8 Interview Questions Complete Playlist :
• Java 8 Interview Quest...
Stream :
If we want to process bulk objects of collection then go for streams concept.
Way to operate on collection in java 8 is Stream.
Its a special iterator class that allows processing collections of objects in a functional manner.
Eg : fetch all objects from collection of list whose value is greater than 15
Why streams were introduced in java 8 if we already had java.io.stream?
Java io streams is a sequence of characters or binary data which is used to be written to a file or to read data from a file.
While streams java 1.8 is no where related to files, its related to collection object.
Java io streams related to file whereas java 8 streams are related to collection object.
Hence if we need to perform some operations on collection there we should go for streams.
To represent group of collection as single entity then we should use collection concept.
If we want to perform operation on bulk objects in collection then we should go for Streams.
We can get stream object by :
Stream s = collectionObject.stream();
Once we get stream object we can process the object of collection.
Processing of stream consists of 2 steps/ stages
Configuration of stream
Processing that configuration
Configuration can be done by
Map
Filter
Stream s = collectionObject.stream().filter(i 🡪 i % 2 ==0);
What if we don’t want to filter out.
We rather want to create new object against each existing stream object based on some function.
EG in given stream create new object by squaring its value
If we want to fetch / filter objects from collection like eg : filter only even numbers from array list collection the use Filter for configuration of stream.
If we want to perform some operation on each objects of the collection then create another mapped object with different value(after operation is performed ) for each object of that collection, then use map.
In filter, because of filtering, number of objects in filtered list is less than original list While in Map same number of objects are there in both new and original list created.
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[@SkepticTuism]

This lady has found out how Java is meant to be taught. You're literally teaching new things while taking interview questions which is very effective way of teaching. We students usually face issue on where to learn concept and where do find questions but you've covered that gap brilliantly. Brilliant !

[@CodeDecode]

Thanks for such a nice comment man. Means a lot to us 🙏🙏

[@ramsp35]

I have never seen any tutor sparing this much of energy to explain the concepts to the viewers. You deserve 5 star, if there were any star rating for this video. Keep up the good work.

[@CodeDecode]

This means a lot Ramanathan 🙏🙏🙏🙏🙏thanks. This doesn't let our hardwork go in vain 🙏🙏

[@josemarioespinoza6652]

@@CodeDecode Yeah, I confirm, its really enjoyable to see how you care about the concepts youre explaining

[@tallurivamsi6413]

Dont know whats the name of the tutor,take a bow.....you completly nailed it with perfection,how effortlessly you are teaching that makes complete sense to the audience.....Please keep inspiring us and educate us......

[@veera119]

Liked this video so much! Learnt streams for the first time and understood it very clearly in a single video! Keep up the good work 👍🏻🤗

[@CodeDecode]

Thanks 🙂🙂

[@mohammedsufi4649]

Thanks a ton mam! I have never understood these concepts these well! We have no words to really thank you for your great efforts and the way you teach us to understand complex things very easily and we will not forget them. I wish you to grow more in teaching in tech career. Please never stop and keep creating or covering more concepts. Thanks you so much again

[@magantiraju93]

one of the best explanation on streams.whenever i revise for any java interviews will refer your videos..Thank you so much for your hardwork !!

[@CodeDecode]

Thanks for the nice words

[@chandiniasha7359]

Very happy to find such videos... really helpful also clear explanation .. expecting more and more from u ❤️

[@CodeDecode]

Thanks 👍☺️

[@sagarikadevnath2716]

You are a saviour.......so much detailed explanation and so much efforts...I am really really thankful🥺

[@CodeDecode]

❤❤

[@AbhishekKumar-on8zm]

You don't know how much your helping people like me mam. Thank u so much for the video. From now on words I don't get any fear learning new concepts in Java because I have your teachings. Thanks a lot keep up the good work.

[@CodeDecode]

So glad to hear that Abhishek 🙏😊😊👍👍❤️

[@AbhishekKumar-on8zm]

@@CodeDecode 😊😊

[@GauravSharma-sq7zc]

You are such a superb tutor! Stay blessed and Thank you very much!!

[@CodeDecode]

Thanks Gaurav 🙂

[@mit1696]

Very effective video. I got clear idea of Stream and removed phobia for Stream from my mind

[@CodeDecode]

Thanks

[@sproutboot]

Very good. Cant wait to see next one that you mention in the video. About of() and stream processing part.

[@CodeDecode]

Thanks Lee ❤

[@manindersingh6371]

Watching till this video. Content is Awesome. Thanks for making the videos on the that. I would like to say that the way you are explaining the things is awesome. Would like to watch videos if you will cover the topics of Kakfa and security with okta. I searched everywhere but did not find any good information about that topics.

[@manojyadavofficial8535]

Wow... Again very good content and useful for interview :)
Thank you so much..

[@CodeDecode]

Thanks 👍😊

[@gireeshkumar7959]

Actually waiting for streams.. thanks a ton madam💐

[@CodeDecode]

M glad 👍👍

[@naman_saxena]

Your way of explaining is very clear and easy to understand, thanks a lot!
Next part of this video is awaited. I sincerely request you to cover the following points also for future videos:
1. Multithreading Concepts (wait/sleep/join/yield methods, executor service)
2. Internal Implementation of Collection classes - (HashSet, ArrayList, PriorityQueue, and also Hashmap).
I recently discovered your youtube channel and immediately hit Subscribe, keep posting more videos!

[@CodeDecode]

Thanks for the suggestions. Will upload them ☺👍👍

[@kichaloo3669]

Waiting for multi threading questions please ... upload ASAP.. thank you in advance 🙏🙏🙏

[@CodeDecode]

Sure will upload soon 👍

[@ravikumarmathanya5369]

@@CodeDecode please upload ASAP

[@akshayengineer2018]

Thank you so much mam 😊🙏...
You explains every topic in very simplified way...

[@CodeDecode]

Thanks Akshay 🙂👍

[@jakkalapavithra2734]

Hi, I gone through all ur java8 series in one day morning session, next day am able lo to answer java8 questions in the interview, within 4 days am able to crack wipro, Accenture, TCS, Congnizant etc. Interviews. Thanks a lot for your efforts. Please do videos on collection classes internal implementation like array list, vector, stack, etc.

[@CodeDecode]

Thanks for the motivation and all the very best for your future interviews 😃

[@nagar4u]

You are doing such a good job...Hope you and we(your virtual family) get a handsome amount of subscribers

[@CodeDecode]

Thank you so much and we hope the same ......

[@kamraniqbal3729]

Great video very well explained.
You are doing a awesome job keep it up. Thanks!!

[@CodeDecode]

Thanks Kamran 👍👍🙏🙏

[@satyaprakashparida5507]

Thanks a lot, mam.... actually I'm eagerly waiting for this.

[@CodeDecode]

👍👍

[@kaminisaini7922]

While watching your each video I just got to know one thing teaching profession has its own charm and no one can easily dive and deliver.

[@CodeDecode]

❤️❤️❤️❤️

[@harshasharma8087]

Thank you for making these videos. They are really helpful.

[@CodeDecode]

M glad it is helpful Harsha 👍👍

[@Priya1_123]

Perfect explanation. You are a very good teacher 🙏. If possible please adjust the font size so that the video can be viewed from mobile as well

[@CodeDecode]

Thanks a ton Priya 🙂👍 sure we will do that

[@mansijain8092]

Thanks for this Java 8 Stream video. I'm waiting for Parallel Stream video please upload ASAP. It will be very helpful.

[@CodeDecode]

Sure, we will upload that soon 👍👍

[@sravanthikotte6464]

The way of explaining is very clear and easy to understand.

[@CodeDecode]

Thanks Sravanthi 🙂🙂

[@rachnagupta7804]

way of teaching with live demo is very good by this anyone can easily understand....good job

[@CodeDecode]

Thanks Rachna

[@shashankgarg8128]

Thankyou so much , mam for this amazing content with great knowledge and way of teaching is so good.

[@CodeDecode]

Thanks Shashank 👍👍

[@renuphilip8555]

Appreciate the efforts ,awesome demonstration !

[@CodeDecode]

Thanks Renu👍🙂

[@sreeram543]

Thank you very much .. will be waiting for continuation video.. and also please do it for multi threading

[@CodeDecode]

Sure 👍

[@sreeram543]

@@CodeDecode tie shows ENG means england?

[@kirushnashirre6791]

Good one again, please add flatMap vs map in the next video. Thank you!!

[@CodeDecode]

Sure 👍

[@manognajoshik8465]

Thank you very much ma'am..this tutorial is helping me like anything. Ur hard work is really commendable and such a lovely explanation

[@CodeDecode]

Thanks a ton Manogna 🙂👍. Thanks for all the love and support

[@manognajoshik8465]

Ma'am receiving response from you made my day..could you please provide a tutorial on RMI? Have gone through many videos but could not be successful in understanding it..awaiting your explanation

[@CodeDecode]

Sure Manogna we will do that but tell us you need the level of video to be of developer lever or college graduation level.

[@manognajoshik8465]

@@CodeDecode developer ma'am..

[@sproutboot]

Link to the next one (stream processing) : th-cam.com/video/cqQN8g4oR98/w-d-xo.html

[@CodeDecode]

👍👍🙂🙂

[@prasadjambhale9543]

Really loved this series, thanks for the videos.
Also, there's a joke.
What is Java?
Noone:
Code Decode: Java is NOTHING, but a programming language

[@CodeDecode]

😂thanks for supporting 👍👍

[@shankar8816]

thanks alot mam. i have cleared my interview today. lots of questions from this playlist

[@CodeDecode]

Many congratulations Shankar 🎉🎉🙂🙂. Keep learning keep shining Man⭐✨

[@shankar8816]

@@CodeDecode thank you. Its alot to me . Happy new year 🥳

[@CodeDecode]

Thanks!! Happy new year to you too Shankar. May this year bring you all the success , health and happiness to you and ur family.

[@ayshwaryachavan7738]

Very well explained. 👍 Thank you so much .

[@CodeDecode]

Thanks

[@pradyumnbaloji837]

I loved the way you explain and clear.

[@CodeDecode]

Thanks Pradyumn 🙂👍

[@ajaydangi582]

next level of explanation Wahh ,thank you so much .Moz krdi

[@CodeDecode]

You are welcome....

[@UzoAfrica]

Question: How can you use mapping and stream to multiply two numbers that are in different objectCollection list.
i really appreciate this video.

[@subhampatel993742239]

You can create an IntStream and use the stream values as index of the array and get the values and Multiply in a Map. Streams are not necessarily best everywhere but good for practice

[@aadisaagara582]

This s amazing👍. Keep the good work going.

[@CodeDecode]

Thanks 👍👍🙂🙂

[@nwarkar]

All the topics covered are just awesome, keep doing great work.

[@CodeDecode]

Thanks 👍👍

[@yumraj12]

Hi, You are awesome while describing any thing with code, I am following this channel since long, Do we have a repos for this or all the videos you have?

[@CodeDecode]

We will search and upload on git 🙂

[@bhuvanakuppusamy6933]

Very useful for the interviews . . Thankuuu so muchhhh

[@CodeDecode]

🙂🙂👍👍

[@hrancati]

thank you very much, it was a very clear and useful exposition

[@CodeDecode]

you're welcome

[@pradipkumarbehera9311]

Wonderful explanations... thanks a lot :)

[@CodeDecode]

Thanks Pradip🙂👍

[@sanjaydhikodi7516]

Thanks you so much for crystal clear explainations....Its helping me a lot to revise and understand depth in Java 8....Your hardwork is paying us thats the beauty of your teaching 😊👍

[@CodeDecode]

🙂😇Thanks Sanjay. May you flourish and touch heights in your career Sanjay. We wish u all the very best for your future. Keep Rocking Man 🎉🎉

[@sanjaydhikodi7516]

@@CodeDecode Thanks for your teaching, your java videos making us more confident on subject, Please make videos on executor service on multithreading.

[@user-si5it5ew6j]

Hi, madam, your teaching style is much more energetic if you have no problem can you explain to me which one is faster without a stream or with a stream in my case without stram it's taking 2ms (milli seconds) but in the case of stream it's taking 7ms. (Average)

[@mohammadhamzasiddiqui9832]

Amazing ❤️ thank you so much ! Lots of love all the way from Pakistan ! :)

[@CodeDecode]

Thanks 🙏🙏

[@mohammadhamzasiddiqui9832]

You're Welcome :)

[@moulimanthra7542]

Very Informative and clear explanation thank you

[@CodeDecode]

you are welcome ....

[@vikki5013]

Very Nice and easy video to understand Java Streams!

[@CodeDecode]

Thanks 🙂👍

[@simha691]

Very useful info 🙏🙏🙏, Thank you madam.

[@CodeDecode]

You're Welcome Simhadri....

[@testcase2299]

nicely explained got it in first time.thankyou mam

[@CodeDecode]

You're welcome

[@user-rl8dl2sz9f]

Great video with full explanation. 👍🏻

[@CodeDecode]

Thanks

[@shreyagupta7675]

Very helpful!!!❤️

[@CodeDecode]

Thanks....

[@abhishekchaudhari2344]

Your videos helped me a lot!! in future will defenitely buy bigger super thank

[@CodeDecode]

Thanks Abhishek. You being around is the most important thing for us. 🙂🙂keep learning keep rocking Man 🎉🎉🎉🎉

[@kirushnashirre6791]

Please make videos on Multi-Threading, Structural Design Patterns, Behavioural Design Patterns and JEE Design Patterns.

[@CodeDecode]

Sure 👍

[@swamulupasupuleti324]

Hi Madam,
I am working on one of the multinational company but here using only java 1.7 only but i want to learn java 1.8 at that time , i am searching in TH-cam and saw many videos but from the heart it is very understandable for your videos.
Thank you good explanation madam but please share with me continue videos on this. Finally i became strong in java 8

[@CodeDecode]

Hello. Thanks for such an awesome comment. These comments motivates us to put more such content. Thanks for taking your time out to appreciate us 🙂👍

[@CodeDecode]

Java 8 Interview Questions(New Features): th-cam.com/play/PLyHJZXNdCXsdeusn4OM33415DCMQ6sUKy.html

[@CodeDecode]

Java 8 Coding Interview Questions (Most Asked): th-cam.com/play/PLyHJZXNdCXsfcMboYwGoL6wKAFPxljz5W.html

[@amarthyaseshu683]

Thanks for sharing!

[@CodeDecode]

You're Welcome....

[@rahul.ranjan1242]

Very nice explanation, thanks a lot.

[@CodeDecode]

You are welcome...

[@rahul.ranjan1242]

@@CodeDecode pls upload the pdf also, if possible

[@ramyal5371]

Well explained👏👏👏 ma'am please upload next part

[@CodeDecode]

Sure 👍👍

[@kichaloo3669]

Thank you so much 🙏🙏🙏

[@CodeDecode]

👍👍👍👍

[@rajeshs3581]

Nicely Explained

[@CodeDecode]

Thanks 👍

[@manosij00roy]

Thank You so much!!

[@CodeDecode]

Welcome 👍👍🙃🙃

[@harishtati5667]

I have one doubt mam. When i hold ctrl and clicking the inbuilt classes like arraylist or whatever it is then its going to that particular class but i couldn't see those in left side package explorer. Do we need to make any configuration for that mam?

[@harshach8314]

Thank you soooooo much for your valuable information it's alot for me 👏🤝💐

[@CodeDecode]

Thanks for the nice words

[@nancyagarwal8570]

Please make videos on
1. Map vs flatmap
2. Map and reduce
3. Optional in java8

[@CodeDecode]

surely we will create it soon.. thanks for the suggestions

[@nikhileshyoutube4924]

Very clear explanation ⭐⭐⭐⭐⭐ 🔥

[@CodeDecode]

Thanks Nikhilesh 🙂👍

[@princeofareas198]

Streams will take only one input and if have many parameters to pass and need to validate inside the lambda expression, (i.e list is already coming inside filter or map, i need another two parameters where I want to check the condition ?
Also I have a flag/boolean/string, based on the interation, I need to set the new value and return?

[@vigneshn4530]

Parallel stream technique video please do it ASAP
I LIKE YOUR TEACHING METHOD

[@CodeDecode]

Next video will be on parallel streams 🙂

[@jayakrishnathammana]

I have a suggestion, when you are explaining a problem. Please zoom out the content as the font size is less...
A part from that , content is as good as usual...

[@CodeDecode]

Sure. We have done that in recent videos. Thanks for the suggestion jayakrishna 🙂👍🙏🙏

[@Sachin-je7ue]

When she read only one line and said to much of theory let try in IDE .😂😂

[@CodeDecode]

🤣😝 nice observation 😃 i don't like theory much that can't be proven🙊

[@saikiranGoud444]

Well explained 👍🏻

[@CodeDecode]

Thanks 👍👍

[@maheshakkemwar509]

Thank you 3000 🙂

[@CodeDecode]

🙃👍

[@tabishquadri]

very well explained in very less time.

[@CodeDecode]

Thanks tabish

[@blessyRelatable]

Very nice explaination thank you

[@CodeDecode]

You are welcome....

[@preetamkumar591]

Nice and clear explanation 👌👌
could you please provide us the source code for this concept?

[@kazaasekhar]

really good thank you for your channel

[@CodeDecode]

Thanks Sekhar 👍

[@narenm2031]

Excellent

[@CodeDecode]

thanks...

[@navneetranjan4215]

Very good content.....helpful for all...on lighter note...dogs are barking in background :-)

[@save2strokes593]

please share the source code of java 8 features programs, thanks a lot,mam for giving such a wonderful information ....

[@CodeDecode]

Hi Siddesha , below is the git link for all the source code we used :
http link : github.com/codedecode25/Java-8-demos.git
ssh link : [e-mail]:codedecode25/Java-8-demos.git
Please clone and let me know if u are able to access the code base

[@ninadkhire]

Very very very very very good videos....!

[@CodeDecode]

Thanks Ninad....

[@iloradas6387]

Hi your videos are very easy to understand, thank you for putting in such amazing work. Could you please create a Spring interview question series.

[@CodeDecode]

Hi. Thanks. It's already uploaded in playlist. Please let me know if you don't find one

[@iloradas6387]

@@CodeDecode Hi thanks for your response. I do see couple of tutorials for Spring Boots but can't find on Springs specifically. Is it part of other video?

[@CodeDecode]

@@iloradas6387 Yes we haven't made video on particularly Spring yet. But we will upload it soon . Thanks for the suggestion

[@mayankyadav9425]

Thanks a lot

[@CodeDecode]

👍👍

[@anjalijaiswal1750]

Awsome Ma'am!

[@CodeDecode]

Thanks Anjali 🙂👍

[@pratsin7464]

for the first example we could have used for(int x:l) {
if(x>=15
Sysout(x)} where l is of integers.

[@pratsin7464]

if new array needs to be created in that case
List newl = new ArrayList();
for(int x:l) {
if(x>=16) {
newl.add(x);
}
System.out.println(newl.toString());
}

[@dibyaray5454]

Your way of explaining makes things simple and easy to understand. It's really great 👍 Thanks for all your efforts.

[@CodeDecode]

Thanks Dibya 🙂👍

[@vinayuddagiri]

Very good explanation.

[@CodeDecode]

Thanks Vinay

[@unemployedcse3514]

awesome ❤

[@CodeDecode]

Thanks

[@vickybhoir3017]

nice explaination

[@CodeDecode]

👍😊

[@sandeepgattu5690]

Waiting for Parallel steam concepts madam please do it ASAP

[@CodeDecode]

Sure

[@ponsivakumarmanoharan4994]

thank you

[@CodeDecode]

You are welcome ....

[@Cityview525]

Very good..

[@CodeDecode]

Thanks

[@paridadeepika]

nice one..

[@CodeDecode]

Thank you 😃

[@koraboinarajkumar8228]

HI can you please take one vedio use if else condtions and null checks using java8.

[@CodeDecode]

Nice topic. Thanks for suggestion we will do that soon 👍🙂

[@onlinetrainingacademy7684]

Good one

[@CodeDecode]

Thanks

[@priyankau1982]

Awesome. Mam your explanation is crystal clear and way of teaching is also superb!! Waiting for more videos from you :) :)

[@CodeDecode]

Thanks Priyanka 🙂👍

[@dreamyme543]

understood:)

[@CodeDecode]

🙂🙂

[@velankayalasrinu2190]

please do videos on complete spring and docker

[@CodeDecode]

sure we will cover it soon