Most Asked Tricky Core Java Interview Questions and Answers for Fresher and Experienced |Code Decode

In Tricky Core Java Interview Questions and Answers for Freshers and Experienced video you will get top tricky core interview question asked in an Interview.
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You may be asked in java interview questions and answers pattern about :
What are the different ways we can break a singleton pattern pattern in Java?
Reflection
Serialization
Cloning
By Executor service, will create separate video on that.
One of the tricky part of java interview questions and answers are :
Difference between
NoClassDefFoundError
and
ClassNotFoundException?
java interview questions and answers for experienced people may be bit trickier.
Apart from String, what else predefined class we can use as Keys in A Map?
java interview questions and answers for experienced people will always cover some java 8 stuff
Given an Employee list , sort employees based on their salaries in desc order?
Java interview questions and answers will always cover top java interview questions and answers and java 8 always dominates it now a days
Fetch Top 3 salaried Employees?
Java interview questions and answers may be twisted to fetch result in different manner too as shown as below
Fetch all employees having salary less than 3rd highest salary?
Java interview questions and answers playlist is referenced below for easy access.
In top java interview questions and answers or for core java interview questions and answers , you will never be asked straight forward questions like below:
Why is char[] preferred over String for passwords?
In Java, Strings are immutable and are stored in the String pool. What this means is that, once a String is created, it stays in the pool in memory until being garbage collected. Therefore, even after you’re done processing the string value (e.g., the password), it remains available in memory for an indeterminate period of time thereafter (again, until being garbage collected) which you have no real control over.
Therefore, anyone having access to a memory dump can potentially extract the sensitive data and exploit it.
In contrast, if you use a mutable object like a character array, for example, to store the value, you can set it to blank once you are done with it with confidence that it will no longer be retained in memory.
Theses were some java interview questions and answers
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[@muralikommuru5992]

Great, always there is something new to learn in your videos....! And please prepare video on executor service breaking Singleton. @Code Decode. Also would like to highlight as @shankar did that class not found is compile time because compiler forces us to handle that exception. It’s not like any other nullpointer exception which our compiler doesn’t, force to handle. That’s the key I think, but as you said we have to decide by seeing that whether compiler is checking DRIVER class or not, then I think no exception can be called as compile time exception. PLEASE CORRECT ME IF MY UNDERSTANDING IS WRONG.

[@sanketh768]

Would love to see a detailed video on different ways of breaking singleton pattern. Please make a video on it.
It would be helpful for many people

[@CodeDecode]

Sure Sanketh, we will create that soon 👍👍

[@imvickie1497]

ua-cam.com/video/P4losX0HxwE/v-deo.html

[@shilparani6266]

@@CodeDecode is this video created, if yes please share video link

[@karthikeyanrm3446]

Excellent video. Yes, few more java 8 scenario based questions, also scenario based for core java concepts - like abstract class, interface etc.. also we are asked how to create hashing on our own and something similar to strings as well?

[@CodeDecode]

Nice topics Karthikeyan 👍 we will surely create video on these

[@vijayakalgudi9895]

Thank you code decode for these videos.. Would like to see more on Multithreading and synchronization, also sql related interview questions. Thanks again :)

[@CodeDecode]

Sure Vijaya we will plan it and upload it soon...

[@vijayakalgudi9895]

@@CodeDecode thanks a lot

[@CodeDecode]

👍👍

[@Avinashkumar-re8zh]

Nicely explained.
We need more videos like this to crack the interview.

[@CodeDecode]

sure Avinash we will upload it soon....

[@TheITEngineer]

Mam, you are doing a great job.. it's helping a lot to quickly prepare for interviews..

[@CodeDecode]

Thanks for the nice words Aniket

[@shamilraj322]

Very clear explanation. Nowadays I became an addict of your videos, it really helping to brush up old things and learn so many new things. Can you please do more videos on Java 8 stream programs.

[@CodeDecode]

Thanks Shamil. Sure we will upload more videos on practical implementation of java 8 features🙂👍

[@arkaroy1257]

Nicely explained. Ofcourse, we need more detailed interview trending questions.

[@CodeDecode]

Sure we will upload it soon...

[@devopsexpedition4867]

Hi dear. Your videos are very helpful. I shared you videos to my friends. I am experienced in java. But refreshing java theory concepts by your videos. Now am looking for job change and I cleared several technical rounds.

[@CodeDecode]

That is such a great news that you have cleared many interviews Congratulations man ! Keep learning keep growing :-)

[@jskr456]

as always , excellent work by code decode.
good explanation.

[@CodeDecode]

Thanks Shashi 🙏. This means a lot 🙏

[@tulasiramsunkara]

Excellent explanation. Appreciated your efforts

[@CodeDecode]

Thanks Tulasi....

[@himanshuchugh2865]

All your videos are amazing !

[@CodeDecode]

Thanks

[@gautamsnegi27]

Great video. The password question was mind boggling. How about a real time example of accessing the memory dump and fetching the sensitive data.

[@CodeDecode]

Thanks Gautam. We will try to make video on it....

[@saaiidubbings1126]

​@@CodeDecodestill I have confusion in noclassdef

[@prashantkashyap7623]

more questions on streams like groupby functions . Thanks ,

[@CodeDecode]

Sure Prashant 👍👍

[@shubhisharma3790]

Very clearly explained. Please add more such scenario based videos.

[@CodeDecode]

Sure Shubhi 🙂🙂👍👍

[@shankardayal6928]

ClassNotFoundException is a checked exception and occurs when the Java Virtual Machine (JVM) tries to load a particular class and the specified class cannot be found in the classpath.

[@CodeDecode]

Checked exceptions are checked at compile time by compiler Shankar. If u have watched the video, can u see any compile time error there!??. Please don't follow blogs blindly man. Please help us if we are wrong but as far as we know, it's runtime.

[@CodeDecode]

And Jvm comes into picture during runtime and javac is used during compile time 🙂. There is some misunderstanding I believe because u only said Jvm comes into picture in this type of error and jvm comes into picture during runtime n not compile time. Hence u only proved its runtime exception. But nice doubt, it will help people getting their doubts cleared. Thanks 👍👍

[@shankardayal6928]

@@CodeDecode
Java docs is saying ClassNotFoundException is checked because it is child class of Exception class.
Any child class of RuntimeException is unchecked.
Hope now it is clear.
docs.oracle.com/javase/7/docs/api/java/lang/ClassNotFoundException.html

[@shankardayal6928]

@@CodeDecode At runtime only JVM will check exception of any type.
Correct me if wrong

[@shankardayal6928]

I never want to teach you but I found some mistake thus informed you.
You are doing very great job by helping us with this set of questions.
Hope you will not take my suggestion in other way 👍👍👍

[@gokulaher2476]

Hi! thank you for this video and pl.make more such videos

[@CodeDecode]

sure gokul we will make it soon......

[@StudentTechnique]

Very well explained that classnotfoundexception and noclassdeferror

[@CodeDecode]

Thanks ......

[@SN-cl2ct]

Nice questions, should add interveiw questions more frequently, very helpful. 👍🏼

[@CodeDecode]

sure Saurabh we will do that ......

[@SN-cl2ct]

Should also add videos on Data structure, must do interview questions.
Looking forward to it.

[@rampatil1261]

Very useful
thank you so much

[@CodeDecode]

Thanks Ram

[@greeshmaA08]

Nice explanation. Please make a video on all the remaining operations like forEach, reverse etc.

[@CodeDecode]

Sure Greeshma .... we will create one soon

[@sureshgarine]

Thank you Madam! can you please create a video on each topic reflection, serialization and cloning breaking the sinlgeton design pattern as well

[@CodeDecode]

Sure Suresh 👍👍

[@ramshah6733]

sir, does selectorshub certification helps in interview and what are the selectorshub interview questions?

[@shobhitagarwal8151]

Please make a video on spring security and API gateway . Also, I am up for ways of making singleton design pattern more detailed in video.

[@CodeDecode]

Sure 👍👍

[@sreerekhamenon1164]

Excellent explanation.. Keep going..

[@CodeDecode]

Thanks Sreerekha

[@shanedetsch]

Nice tutorial, consider using the eclipse vim plugin.

[@CodeDecode]

Thanks Sure 👍

[@ghostneguz]

Please provide the java code for breaking Singleton patter. Will be really helpful

[@CodeDecode]

Sure 🙂👍 we will create that soon 👍👍

[@vishaljain9634]

Use reflection

[@sweetibharati3260]

I would like to know more about Java 8 interview questions ,it will be nice if u cover them

[@CodeDecode]

Sure sweeti we will cover it soon

[@venkatasaikrishnak6984]

Could you please create more and more videos...all possible questions of Java8

[@CodeDecode]

Sure Venkata 👍👍

[@MrMikomi]

You can use any class as a hashmap key. Primitives of course are not a class. Key just needs to implement equals and hashmap, even if it's in a bad or illogical way.

[@rushikeshgodase8498]

if we are making instance as private in singleton class how can we access that in main class to change it's reference?

[@start1learn-n171]

Tq

[@vndprasadgrandhi7024]

Hi very helpful video. Thanks for creating for us. Recently, I faced interview. Interviewer asked get the 2nd highest salary of employee using streams. Please let me know

[@CodeDecode]

Sure 👍👍

[@RajYadav-fy4lm]

🔥awesome one 😊

[@CodeDecode]

Thanks Raj.......

[@AashishSahu.9]

nice expiation I faced all these questions in my interviews

[@CodeDecode]

Yeah, we too once upon a time. Hence we decided to cover it 👍👍

[@archfitness2399]

Yes, today I stucked in my interview 😭😭

[@CodeDecode]

No worries, don't be disheartened. Its a part of professional journey. We all have faced rejections and then what we get is the best. All the best man. You deserve much more 👍👍

[@devopsexpedition4867]

@@archfitness2399 don't worry dear. Interview is also an experience. After few interviews we will be confident to answer the questions.

[@SaiTeja-ym2er]

Thanks for sharing knowledge. Could you please make more videos on collections program. one of interviewer asked me, fetch the employees who located at Mumbai city. please explain this one. if possible.

[@CodeDecode]

Sure Sai. We will cover it 🙂👍

[@riteshranjan5221]

Please add more question on java 8 stream programing that mainly asked during interviews.....

[@CodeDecode]

Sure Ritesh 👍👍🙂🙂

[@jean-paulboga8189]

Thanks

[@CodeDecode]

🙂🙂👍

[@parthibankalimuthu2584]

Pls share all the interview questions and answers in notes..it will helpful to others

[@CodeDecode]

Sure 👍

[@amhar5677]

I need more interview questions on Java 8 such as flat map,map,optional etc

[@CodeDecode]

ua-cam.com/play/PLyHJZXNdCXsdeusn4OM33415DCMQ6sUKy.html

[@prachi2439]

Hi mam, can you please provide demo of breaking singleton pattern in java

[@saurabhmantri8573]

In Java 8 example, can we use first map with salary and then Comparator.reverseorder() method directly instead of expression ?
Btw thanks for the video :)

[@CodeDecode]

Yes Saurabh we can do that. There ae multiple ways to do that👍👍

[@CoolBruce100]

map() will give you list of salary and you'll be sorting that.. We need the list of Employee and not list of Employee's salary. I hope it is making sense.

[@sreejak6776]

We need more of these and demo too

[@CodeDecode]

sure sreeja we will upload it soon....

[@sushmakolli1119]

Please provide the complete demonstration of how to break singleton design pattern with code it will be helpful.

[@CodeDecode]

sure Sushma we will provide one soon

[@sushmakolli1119]

And also cover more interview questions based on streams(java8).

[@computerknowledgeful]

Thanks mam

[@CodeDecode]

👍👍🙂🙂

[@phanimadhuri4087]

Good Info.

[@CodeDecode]

Thanks

[@priyanka0112]

Please include More Java 8 coding questions like this

[@CodeDecode]

Sure Priyanka. Thanks for writing back 👍👍

[@debpriyasaha4804]

I was asked what is the difference between singleton design pattern of java and that of spring?

[@virajnaik102]

Spring create singleton object per ApplicationContext. If you have more than one ApplicationContext in your project Spring will create more than one object. In contrast Java Singleton object is created per JVM.

[@rajyalakshmitammineedi8662]

Please make a vedio on how to break single ton using executor

[@CodeDecode]

sure rajylakhsmi we will plan and upload it soon.

[@raghavendrac1053]

Please do make more vedios on Java 8 coding questions

[@CodeDecode]

Sure we will create more videos soon

[@yaminin6487]

Java 8 interview questions with map and flatmap and intermediate streams and parallel streams

[@CodeDecode]

sure Yamini we will upload it soon...

[@lakshmaiahyannagiri291]

Hi it's was very nice
where we can find your code .
please share me the link java 8 program interview part questions

[@CodeDecode]

Every thing about java 8 is here
ua-cam.com/play/PLyHJZXNdCXsdeusn4OM33415DCMQ6sUKy.html

[@Akki31]

Please upload video on java stream api example for all the methods

[@CodeDecode]

Sure Akshay, will do that 👍

[@tataapparao7935]

Clear create the demo session for break singleton pattern

[@CodeDecode]

sure we will create it soon

[@tataapparao7935]

@@CodeDecode thanks for your reply

[@hemapriyaammu7365]

Can please make a video on junit testcases

[@CodeDecode]

sure we will plan and make video on that

[@hemapriyaammu7365]

In what scenario we will use singleton? What’s the use of it ?

[@rishiraj2548]

🙂👍

[@shyamsanghvi4410]

Want every interview questions related to java 8

[@CodeDecode]

sure Shyam we will upload it soon....

[@koppulanaveenraddy4822]

Not able view code clearly.please zoom in more

[@CodeDecode]

Thanks for the observation 👍👍🙂🙂. We did it in next video

[@rajyalakshmitammineedi8662]

Please

[@coincidentIndia]

We can use minus (-) in front of compareTo
employeeList.stream().map(Employee::getSalary).sorted((e1,e2)->-e1.compareTo(e2)).collect(Collectors.toList());
and if we want the list in Ascending order with unique element use TreeSet while collecting. ie collect(Collection.toCollection(TreeSet::new));

[@nooruddinraotiwala353]

Nicely and perfectly crafted library thanks for sharing, I would suggest updating this library with new latest questions or I would like to share some new question bank as I have over 100+ new questions relevant to these recent year share me your email id to sent your way!!!