Java String interview Questions and Answers with example| Immutable | Most Asked | Code Decode

In this video of code decode i.e. Java String Interview Questions and Answers for freshers and experienced.
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We have taken some most commonly asked Interview questions along with their answers
This string Interview questions are asked in almost every interview of Java whether it would be freshers java interview or experienced java interview
Please watch this video of Most Asked String Interview Question as it cover very important string interview questions and answers.
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What are the different ways to create string objects?
String objects can be created in two ways:
Using the ‘new’ operator.
Using double-quotes.
String S1 = new String("code");
String S2 = "decode";
When the String is created with the double quotes, JVM searches it for in the string pool; if the same value is found, it returns the reference to that String else creates a new object with the new value provided.
In the other case, if the String is created with the ‘new’ operator, then JVM creates a new object but not in the string pool. If we want to create the object in the string pool, we can use the intern() method.
What is a string constant pool?
The memory space allocated in the heap memory to store the string literals is called the string constant pool.
No two string objects can have the same value in a string constant pool.
Why is Java provided with String constant pool as we can store the objects in heap memory?
String constant pool provides the facility of reusability of the existing string objects.
When a new string object is created using the string literals, then JVM first checks in the pool if this String already exists or not.
If it exists, then it will reference the existing String rather than creating a new object.
This will help in the speeding up of the application and also helps in saving the memory as no two objects will have the same content.
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[@anooppressboltme2477]

I am mother of 2 year old toddler and 4 years gap in software field. Because of ur videos I have cracked interviews. Thanks a lot 🙏

[@CodeDecode]

So glad to have you back in IT industry 🎊🎊🎊🎊many congratulations on clearing interviews. M sure u will rock 🤘🤘thanks a lot 🙂🙂

[@Rajshimishra123]

Same case with me hope your videos help me to clear interview plz pray for me

[@deepat2272]

So happy to know that a mother with gap has cracked it. Thanks for sharing and inspiring others as well.

[@nirvikajewellers2390]

hi dear am trying to join as how u prepared pls let me know

[@rupadevigujjari2202]

Yes...True..your videos are very helpful and easily understandable .Great Job. Many Thanks :)

[@kalekar100]

I have cracked multiple interviews purely based on your videos only. Be it core java, streams, spring , boot, hibernate. Since then I have been watching your videos as soon as they are uploaded and have recommended my friends to do so. I think what offer I have earned today is entirely based on your efforts and credit goes to you.Very grateful to you mam 🙏🙏and excited to watch your new initiatives. Please keep going.

[@CodeDecode]

Many congratulations Sourabh. Well deserved Man 👏👏👏👏👍🙂🙂. Keep shining keep rocking. Thanks for supporting us 🙂🙂

[@kalekar100]

@@CodeDecode all thanks to you maam 🙏🙏

[@CodeDecode]

Anytime Sourabh. U are a champ 👏👏

[@rajatsahu8767]

++1 even i am in similar in a similar position thanks @CodeDecode ... my JAVA knowledge has been improved a lot.

[@Sunilkumar-jn7ci]

Very Well explained !. Just want to add for last example , when you do concatenation of s1 + "decode" , it actually creates a new object for "decode" and than "CodeDecode" , after the 2nd line there will be 3 objects in string pool. Thanks for reading , correct me if you think differently.

[@vasundharachintha5037]

This is really really helpful. Got all my doubts cleared related to Strings in java with this one.

[@manishagarwal1505]

Thank you for your Great work!! These videos are short and to the point and good to brush up concepts before interviews, keep up the good work!!

[@CodeDecode]

Thanks a lot Manish 🙂🙂👍👍

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I never comment on yt videos but I want to say I became a fan of your teaching... I'm on a spree watching your videos and it is helping me a lot in my professional upskilling. Thanks a lot Mam! ❤❤

[@CodeDecode]

Thanks for such a beautiful comment 😊 all hard work is paid off seeing such nice words 😊 keep learning keep shining 🌟🌟

[@shwetabhat9981]

Thank You so much ma'am . Can't really appreciate you guys enough for all the efforts that you put in . Helps so so much for interviews , pretty much looks like interviewers too just pick up questions from your channel 😅 . Thank you again and as usual looking forward to many more videos .. 🙂

[@CodeDecode]

Thanks a lot Shweta 🙂🙂👍👍

[@gautamagarwal9761]

Excellent video! Just to the point and lots of important learnings to take away from this video! 👍👍

[@CodeDecode]

Thanks a lot

[@firdousbelim581]

Very very Nice Explanation mam. Please make series of java interview questions Array. Loops. Oop and collection framwork.

[@nagapradeepvankayala7301]

Excellently covered end to end complete string concept...

[@CodeDecode]

Thanks 🙂🙂👍

[@suyashgupta6480]

please cover the most asked string coding interview questions. Your content is awesome!! Thanks for the hardwork

[@CodeDecode]

Thanks for showing us thr path Suyash. We will cover it in next video now 🙂🙂👍👍

[@jainamdesai4230]

Thank you..very informative, helpfull tutorial with easy explanation and best examples 👍👌

[@CodeDecode]

Thanks Jainam 🙂🙂👍👍

[@shyamalirani8478]

Appreciate your way of explaining everything is really unique and easily understandable

[@CodeDecode]

M glad it is Rani. Thanks a lot 🙂🙂👍👍

[@evgeniyazaynulina1930]

Hello! Thank you very much for your videos! I have one question, because I didn't quite catch while watching it. Why is an unreferenced object in String poll, which is created by the "new" keyword along with its value in heap memory, not collected by the Garbage Collector?

[@akashsaha9366]

Awesome. Please make us more strong to clear any java interview question without going to any other channels.

[@CodeDecode]

We hope n target the same Akash 🙂🙂👍👍

[@maksimmakarov9541]

thx a lot for explanation, watched a bunch of videos, your's was the best

[@CodeDecode]

Thanks 😇👍

[@priyankau1982]

hi mam..what a clarity! Am one of ur great fan...love to study your videos... Please add string programming interview qwestions also..

[@CodeDecode]

It's live Priyanka. Thanks for suggestions. It really helps 🙂🙂

[@harshsanmukhani5690]

Your concepts are very clear.. You are making really great videos for everyone. Pls do make the video on string coding questions as well. I want to suggest one example as well which i have been asked in my interview. I had to replace the vowel with the number of occurrences let me explain with example... Suppose there is a string as opportunity so i have to replace o with 2, u with 1 and i with 1 as well because, as you can see that the vowel has been replaced with the number of occurrence, i was also asked to iterate an string using map for this logic. These type of questions can also clear many concepts and help to think big and build the logical thinking. I belive you will be making a video on that as well with great examples. Thanks for making such a great content for everyone. Really appreciated. 😄😄🙌

[@CodeDecode]

Nice question harsh. Sure we will put video on that. Thanks 🙂🙂👍👍

[@nomadicnorthern]

Very informative. Thank you!

[@CodeDecode]

thanks

[@PraneshJoshi23]

Thanks for such awesome content 🙏🏻👍🏻

[@CodeDecode]

You're welcome pranesh

[@afzaluddinmd7755]

Awsome Explanation..Great job🎉

[@CodeDecode]

Thanks

[@indirarani2368]

Thank you for the detailed explanation, please help with my interview question, for String input “hello world” and increment counter=2 , output will be - “jgnnq yqtnf”

[@SaiTeja-ym2er]

thanks for sharing knowledge.

[@CodeDecode]

Thanks Sai 🙂🙂👍👍

[@hoshiyartewatia4959]

Hi There I have one question here, if we create any object using new keyword then it will allocate memory in heap area and in SCP also. So that for further use it will pick that value from SCP means for reasubality. Then my question is why we are storing that value in heap. Why we are allocating two memories for same value. Will it not consume the memory? Please suggest.

[@vgasagar]

When was string constant pool introduced? Or is it der from beginning of java?

[@hakunamatata4880]

@8:25 If it creates one more object in string constant pool, will it be a extra memmory consumption if i don't use it in the future?

[@sabir7788]

Excellent question

[@CodeDecode]

Thanks

[@mayurishinde4968]

Appreciate your way of explaining everything is really unique and easily understandable....Thank YOU😇

[@CodeDecode]

Thanks Mayuri ❤️❤️

[@hasimhsm9731]

Thanks for this valuable information

[@CodeDecode]

You're welcome

[@nidhichhabra2470]

very informative and useful video.

[@CodeDecode]

Thanks Nidhi

[@pradeeppathak4533]

Thank you so much ma'am...it's ultimate explanation 🫡

[@CodeDecode]

Thanks pradeep

[@rajashekar-bu8xd]

Good video, keep up the good work

[@CodeDecode]

Thanks Raja 🙂👍

[@mdumarreza3072]

We need to some other videos Please make on the toString topic immediately Topic should be string, stringbullder, stringbuffer , immutable and mutable Etc

[@kavitakumawat4929]

Ditto same questions were asked to me in one of the interview, 👌👌

[@CodeDecode]

Sure that Kavita. Thanks for letting us know and helping the community

[@akashchoudhary5895]

Thanks a lot

[@CodeDecode]

You're welcome

[@ravikumarkuruba9587]

Thanks Medam

[@CodeDecode]

🙂🙂👍👍

[@ajith_shetty17]

Thank you

[@CodeDecode]

🙂🙂👍👍

[@supriyapandey9339]

Very informative video

[@CodeDecode]

Thanks Supriya 🙂🙂👍👍

[@venkateshlam8818]

Nice information..

[@CodeDecode]

Thanks 🙂

[@antaraghosh19]

Thank you ...

[@CodeDecode]

Thanks Antara

[@testingvinod9545]

Greatly explained ❤

[@CodeDecode]

Thanks

[@testingvinod9545]

One que: if unattended 'code' created while creating obj then what is the use of unattended 'code' where we can use ?

[@dineshthedarkprince]

Thanks.

[@CodeDecode]

You're welcome

[@manognajoshik8465]

Awesome content as always.. waiting for Executor tutorial. There is really no good and understandable tutorial on this topic. It will be very useful for us. Request you to make a video on that topic.

[@CodeDecode]

Thanks a lot Manogna. Sure we will put video on threads soon 👍🙂

[@rishiraj2548]

Thanks

[@CodeDecode]

🙂🙂

[@shashankmishara2946]

Yes mam make this type of video

[@CodeDecode]

Sure Shashank 🙂🙂👍👍

[@shyamalirani8478]

please make one video on string coding interview questions

[@Shankar-lz7zs]

Nice explanation Mam

[@CodeDecode]

Thanks

[@shubhamkhune3132]

Nice work mam, Plz you will make a video in string interview questions and program

[@CodeDecode]

Thanks Shubham 🙂🙂👍👍 we will do that in next video 👍👍

[@akhileshkb9418]

Thnk u mam

[@CodeDecode]

🙂🙂👍👍

[@start1learn-n171]

Tq

[@pradeeppathak4533]

Ma'am plz tell me one thing , if SCp method is superior..then why do we use of new keyword object ?? Plz reply ..it is interview question

[@venkataraghava3173]

nice exp

[@CodeDecode]

thanks

[@rishabhgupta5460]

If scp not eligible for garbage collection then is there a limit how many literals we can create bcz it also takes memory can you vlear it ?

[@vishnushinde281]

Where does it says String s = new String("hello"); creates 2 objects one in Heap memory and another copy in string constant pool. Is there any proof to it (like in java doc)? I just want to clarify it. I am learning this concept from many coders saying it created two objects but how can i be sure it creates 2 objects?

[@shubhamgore4320]

thank you ... please make a video for the array as well.

[@CodeDecode]

Thanks a lot for helping us in deciding priority Shubham 🙂🙂👏👏

[@mayuryadav1561]

Yes please create video on array interview questions

[@ahila5771]

If new keyword creates string in both heap and scp then qhat is the purpose of intern?

[@ArjunSingh-is1bg]

Daily upload karo core java interview questions

[@CodeDecode]

Sure Arjun. We will try to do that. It's just that we all are working IT professionals. We have hectic sprints in agile format. It's difficult to spare time at late hours in night. But sure we wil try to put more videos. Sorry for the inconvenience. 🙂🙂

[@ArjunSingh-is1bg]

@@CodeDecode Hey Thank you for response i know about IT Working schedule , try to upload videos when you have free becoz i will regularly follows you

[@CodeDecode]

Yes will try to increase video frequencies 👍👍thanks for the nice suggestion Arjun 🙂🙂

[@komalkasyap7104]

Mam, I have one question. As u said in string constant pool, garbage collector doesn't work then how memory are managed in scp?

[@CodeDecode]

It will be cleaned as soon as your jvm stops

[@chinmaybhat9132]

But if I have an enterprise application where the app is never stopped, in that case will it not lead to memory issue?

[@kasaramyogesh5166]

Can u make core and advance java video from scratch. It will be very helpful. I am suggesting ur videos to friends too

[@CodeDecode]

kzbin.info/aero/PLyHJZXNdCXsfqAkteaQ6JfZ_IHvxX-Hj3 Here you go Kasaram 👍

[@lavishdaksh6327]

Ma'am please make videos on string and array coding questions. I have given many interviews. Just because of array and string coding I couldn't clear any of them.

[@CodeDecode]

True Lavish. We will now start with coding interview questions on string n arrays

[@lavishdaksh6327]

@@CodeDecode Thank you 😊

[@rishabhthakur7245]

thanx

[@CodeDecode]

🙂🙂👍👍

[@rishabhthakur7245]

This channel is really a true gem.... The way you explain things makes it to easier to understand, i guess i almost spend 5 hours a day learning over your channel . Thanks allot for all of this efforts that you put❤❤

[@rishabhthakur7245]

@@CodeDecode i really don't know your name mam😊 but m sure this channel will grow as hell if you keep doing this🤗

[@saansimple]

Can you make core java course on udmey platform.

[@CodeDecode]

Sure we can do that saan 👍👍

[@saansimple]

Can you make video on Executor Service . Please

[@CodeDecode]

Ok sure we will do that 🙂🙂👍👍

[@saansimple]

Please make video on Executors

[@CodeDecode]

Ok we will put video on Executor framework Saan 🙂🙂👍👍

[@saansimple]

I will be great work for developers

[@CodeDecode]

Ok sure 👍👍🙂🙂

[@rishabanand5318]

Please cover string coding interview questions

[@CodeDecode]

Sure 👍👍

[@avengerblack2042]

Make Video On Android Developer 1 Year' Ex Questions And Answers ..

[@CodeDecode]

Sure

[@harshalsamgir697]

String S1 = "Code "; String S2 = "Decode"; I just wanted to know that in this case how many objects are created? For string s1 in String Constant Pool. For, string s2 it will create an object in heap memory and the literal is stored in String Constant Pool as well is it right?

[@shubhamsurve3296]

Only in SCP..Not in heap .As it's not created with new keyword

[@shrikantsavita6614]

Please upload coding interview questions.... It's a request... Pls

[@CodeDecode]

Sure Shrikant. Thanks for helping us in deciding what's important next 🙂🙂👏👏

[@kameshlekkala1571]

I was recently asked this question in interview. Can you pease help me with answer. Question: what check is happening internally to decide to create new object in string constant pool or to return the reference of object. Also what design pattern is used by string.

[@kameshlekkala1571]

I have answered it as equals() method. But the interviewer asked me, if I have many literals in string constant pool then doesn't it take time to check equals() method against each literal to identify the matched value. I didn't have answer for it

[@hepsiba1237]

Hi Ma'am ..I have one project with errors wil u help to sort it out

[@CodeDecode]

What's the error ?

[@nrk7772]

That's why usernames & passwords can't be as Strings as they can be hacked from String constant pool 🙂

[@CodeDecode]

Yes i was about to cover that in next part 🙂👍

[@user-tw9oy3em9e]

Really it is 38 degrees celsius in your area?

[@CodeDecode]

Yeah. It was hot here at that time. 🙂😀

[@saaiidubbings1126]

Can you make videos in Hindi or telugu aslo mam

[@CodeDecode]

🙂👍

[@user-bk8kz5fg8r]

String a="abcdef"; String b="dghijk"; String c= "lmnopa"; can any one help me from these 3 strings to be compared and find duplicates in java8

[@vivekvivek-nn1xo]

One crappy interviewer asked me exactly same questions. She at the end said that these are most important fundas of java and didn’t selected me 🤨

[@CodeDecode]

Happens Vivek. It's part of our journey. Keep giving interviews and m sure u will clear it. 🙂🙂👍👍keep learning prepare well and things are just at one hand distance for u Man 👍👍

[@codingshashtra9091]

गुरू ब्रह्मा गुरू विष्णु, गुरु देवो महेश्वरा गुरु साक्षात परब्रह्म, तस्मै श्री गुरुवे नमः

[@CodeDecode]

❤

[@techNik94]

What happened in below case In memory String s="abc"; s="xyz";

[@manognajoshik8465]

I would like to suggest some topics on which I haven't found simple and easily understandable videos inspite of rigorous searching. 1) Executor framework 2) Microservices design patterns like CQRS using Axon framework, event sourcing. 3) Resilience4j for Microservices (specifically bulkhead. I couldn't find a single video which could make the concepts clear). 4) Reactive programming in java. I am really waiting for these. And I very much trust it's possible for you alone to make us understand it from grass root level. I haven't found appreciable content on KZbin. I am a regular follower of your content.

[@CodeDecode]

Sure we will put video on them👍🙂

[@nainagupta4949]

i didnt undersatnd why String str = new String("Decode") creates 2 object?

[@shubhamkhune3132]

Plz mam soft copy provide this video

[@CodeDecode]

Sure. We will put how much are allowed in description below

[@fkb_ali]

very well explained. thank you! but can you please not scream

[@AVINASHSHARMA-hu3vm]

Hi everyone please read this Last March 2024 I layoffs from company and I have only 1 year experience in java developer. I try to many companies but not scheduled my interview please help me. it's been 2.5 months