Exception Handling Interview questions and answers in Java | Part -1 | Code Decode

In this video of code decode we have covered all important Exception Handling Interview questions in Java for freshers and experienced
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Q) What is an exception?
The exception is an abnormal condition that occurs during the execution of a program and disrupts the normal flow of the program. If not handled properly it can cause the program to terminate abruptly.
Q) How do we handle exceptions in Java
Try
Encloses set of statements which can throw exception hence are required to be monitored.
Catch
When exception occur, this block catches that exception and work accordingly to handle it or to throw it as required.
Finally
This block gets executed always regardless of exception occurrence. Hence clean up is done here.
Q) Difference between Exception VS Error
Exception
We can recover from exception using try catch block or using throw
Compiler will have knowledge about checked Exceptions hence Compiler will force you to use try-catch blocks
Exceptions are related to application
Exceptions include both checked as well as unchecked type.
Exceptions in java are of type java.lang.Exception.
Error
Recovering from Error is not possible
Compiler will not have any knowledge about unchecked exceptions and Errors
Errors are related to environment where application is running
All errors in java are unchecked type
Errors in java are of type java.lang.Error.
Q) Can we write only try block without catch and finally blocks?
No. either catch or finally is must.
if no then what error will come?
Answer : compile time error saying “insert finally to complete try statement” like this:
Q) Can we write any other statements between try catch or finally block?
No. Try must be followed directly by either catch or finally.
Q) Does remaining statements in try block executes after exception occurs.
No. if exception occurs at a particular point in try block then all statements after that statement where exception is occurred will not be execute and the flow goes directly to either catch block if there is any or else program terminates. Hence we need finally block to do all clean up like closing files or removing locks.
Q) What Is the Difference Between Throw and Throws Keywords in Exception Handling in java?.
Throw
Java throw keyword is used to explicitly throw an exception.
Checked exception cannot be propagated using throw only.
Throw is used within the method.
You cannot throw multiple exceptions.
Throws
Java throws keyword is used to
declare an exception.
Checked exception can be propagated with throws.
Throws is used with the method signature.
You can declare multiple exceptions.
Q) What Happens When an Exception Is Thrown by the Main Method?
When an exception is thrown by main() method, Java Runtime terminates the program and prints the exception message and the stack trace in-system console.
Q) What do you understand by unreachable catch block error.
This error comes when you keep super classes first and sub classes later. Like here We kept Exception which is parent of NullPointer Exception first.
Hence the order of catch blocks must be from most specific to most general ones.
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[@kanchanyasita8272]

Java 7 and beyond, try with resources allows to skip writing the catch as well as finally and closes all the resources being used in try-block itself.
Any object that implements java.lang.AutoCloseable, which includes all objects which implement java.io.Closeable, can be used as a resource.
See this code example
static String readFirstLineFromFile(String path) throws IOException {
try (BufferedReader br = new BufferedReader(new FileReader(path))) {
return br.readLine();
}
}

[@akshataggarwal3277]

thanks

[@azimrahman3584]

More interview questions of exception handling upload it

[@CodeDecode]

Sure

[@sougatabanerjee8832]

Finalize is not a block it is a method of Object class.and another info I found it's depricated from Java 9.correct me if I wrong. Great Video thanks.

[@ig_haxie]

a method is also called as a "block" of code

[@divsreviews2860]

Yes Finalize got deprecated from JDK 9, I read in Java Complete reference 10 book

[@Foodmoods_s]

That method is "Finalized" which is used before the garbage collection, "Finally" is a keyword and a block also which will always execute except when we use the system.exit or in jvm crash abruptly..in these two situations "finally" block will not executed..

[@arlynsneha5052]

Wonderful video mam 🤩🤩🤩🤩🤩. Mam plz do intermediate exception handling questions
too.

[@CodeDecode]

Sure Sneha, we will do that👍👍

[@prisha1729]

Please upload videos on advance exception handling and try with reassures as well. Your videos are great for interview preps. Thanks

[@CodeDecode]

Sure will upload soon

[@rudrarajusowmya8943]

Firstly thanks for this tutorial. Can you cover the Intermediate and Advance level of questions also. It will be helpful

[@CodeDecode]

Sure Sowmya, we will do that👍👍

[@nehaladva256]

please provide video link for Intermediate and Advance level of questions

[@aasimahsan6167]

great explanation cleared all the doubt and also gained confidence

[@CodeDecode]

thanks

[@divsreviews2860]

Hello Mam, You made Java Developer's life easy,, Thank you so much for your dedication towards Java Developer ✌️🙏🏻.. God Bless you 😊

[@CodeDecode]

❤❤Thanks a lot 🙂

[@pradeeppathak4533]

Ma'am I have one year experience in java ..this vdo is fit for me ?? Or this is for freshers only ??

[@CodeDecode]

For every one Pradeep. Range is from 0 to 10 . These are basic but needed

[@MrSumitsharma786]

your videos are amazing pls dont stress on words ending with T,, its really annoying

[@CodeDecode]

Apologies for the inconvenience. Sure we will stop doing that. That was unintentionally done Sumit.thanks for letting us know🙂

[@kingfisher3791]

Mam, where can we find all these as in pdf. This helps many of us for preparation

[@CodeDecode]

Hey, everything is in description bar below 👍👍🙂🙂 happy learning 👍

[@priyanka0112]

create more video on exception handling,multithreading and collection questions.

[@CodeDecode]

sure Priyanka we will create one soon....

[@sonalibajpai8323]

😍😭😭❤️😭❤️💞💞😒💞💞💞💞💞💞💞💞💞😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢💋😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢😢@@CodeDecode in in in

[@sonalibajpai8323]

Iio iiii you can

[@sonalibajpai8323]

@@CodeDecode in in thatioiiii

[@suganyasums685]

Please make video of advanced exception handling like chaining etc..

[@CodeDecode]

Sure Suganya. We will upload it in next few days for sure 🙂👍

[@mohantyfamily1521]

Many thanks for making such wonderful videos and this really help people to Crack an interview. Please make videos on exception handing with real time scenarios along with garbage collector.

[@CodeDecode]

Sure, nice topic. We will create videos on that too soon 👍👍

[@reddaboinavasista4166]

Very Underrated youtuber. Deserves more subscribers.

[@CodeDecode]

Means a lot us 🙏

[@surajchennoju4736]

There is a mistake in your PDF please correct it.
21:50 in final ( 2 line )
"final method can it be overridden" change to "final method can't be overridden"

[@aakashpatel6160]

Mam plz do intermediate exception handling questions

[@CodeDecode]

Sure Aakash 👍👍

[@yokesh0075]

Hi, Could you please add video for advanced or experienced level.

[@CodeDecode]

Sure we will create one soon

[@akshayghanekar839]

Please add interview questions for 3+ year experience

[@CodeDecode]

sure we will upload it soon

[@abhigyansharma9108]

Mujhse yh poocha gya mai bata nhi paya tha :(, kaash yh dekhli hoti

[@CodeDecode]

You will do great in your upcoming videos man !! Trust me !! All the very best for your interviews !!

[@GautamKumar-qx3rt]

Really helpful video mam but please be slow
thnak you

[@CodeDecode]

Sure Gautam thanks for inputs 🙂🙂👍👍

[@sandhyarajkumar8597]

Your explanation is amazing...to the point...understandable...keep making such videos...😊

[@CodeDecode]

Thanks a lot Sandhya 🙂👍

[@sukunkusum1720]

Hi Team CodeDecode! hope you are fine. excellent video as usual. Please make a video on try with resources and exception chaining!

[@CodeDecode]

Sure Sukun, we will do that soon 👍🙂

[@Hare_Krishna143]

Such helpful content!!! Appreciate

[@CodeDecode]

Thanks for the nice words Manoj

[@prithvisingh40]

Advanced exception handling will be helpful

[@CodeDecode]

Sure

[@sreejak6776]

Mam pls do exception handling other parts also

[@CodeDecode]

Sure Sreeja 🙂👍

[@nehagirase2656]

Hello mam, thank you this video so helpful mam but can you make experience level exception handling questions

[@CodeDecode]

Sure. I will soon create advance level interview questions for this topic

[@rampatil1261]

Thanks you so much for this video
Please make Advance questions also

[@CodeDecode]

sure ram we will make it soon

[@rampatil1261]

@@CodeDecode thanks in advance 😃

[@ayushman_19]

Please continue this exception handling series

[@CodeDecode]

Sure Ayushman 👍👍

[@jeevansaimanikanta782]

Please upload intermediate and advanced level video

[@CodeDecode]

sure we will upload soon...

[@shamukakhamari4661]

Please make videos on thread interview questions . your explanations are really amazing.👍

[@CodeDecode]

Thanks Shamuka 👍. Sure will create a video on multithreading

[@farhansheikh1278]

Can you also create a interview questions on File Handling? Thanks☺

[@ravirajsaraganachari3038]

Please make next set of FAQ on exception.

[@CodeDecode]

Ok sure

[@VarunGowda-g6x]

love u madam tq gave much info😍

[@CodeDecode]

❤️❤️

[@avneeshsaxena2260]

Plz do make video for multithreding real time senario based interview question.
I have searched on entire TH-cam but did not get single video which is good.
They have asked like where do you use multithreding in your web project...?

[@CodeDecode]

That's very nice topic that you have suggested. I will surely make a video on this.

[@CodeDecode]

If possible can you please share what all kind of questions you have faced that you want me to cover.

[@yoshitamahajan353]

@@CodeDecode where have u used multithreading in your project is one the question

[@YajurVlog]

mam finalise i am unable to understand. how it looks how garbage collector workks please show an example rather definantion

[@NSreenivasulu-d2p]

Upload intermediate and advanced level questions... maam.

[@UttrakhandPahadiBoY1]

What does propagated meaning?

[@CodeDecode]

Means moving up one calling hierarchy

[@muchukundareddy5315]

Could you please tell me in which scenario we will create customized checked exception and in which scenario we will create customized unchecked exception?

[@pankajsharma31]

please upload second part of video

[@CodeDecode]

Sure Sunny 👍🙂

[@user1994gms]

Mentioned in comments.. do a video on it

[@CodeDecode]

th-cam.com/video/RS8oyAJHl2M/w-d-xo.html

[@richamehta1179]

Please make on advance level too.

[@CodeDecode]

Sure Richa we will make it soon

[@aaaaaaaa3811]

very nice and awesone explanation.👌👌👌....keep doing more n more videos like this mam.....hatsoff to u...

[@CodeDecode]

Thanks 👍👍

[@sonalgupta7083]

Can you please upload video of java best practices

[@vinothkumarg7731]

Very useful Pls upload more on that

[@CodeDecode]

Sure thanks 😊

[@nikhilratnalikar6068]

Can we call finalize() explicitly??? What will happen if we call this method manually??

[@CodeDecode]

You can call finalize() method explicitly on an object before it is abandoned. When you call, only operations kept in finalize() method are performed on an object. Object will not be destroyed from the memory.

[@aaaaaaaa3811]

1. How u have handled expections in u r project?
please give a brief explanation on this mam....asked many times in several interviews...

[@CodeDecode]

Will try to put next video on exception handling with spring.

[@sankarasubramanian568]

good content, thanks !

[@CodeDecode]

you're welcome

[@shubhamtagalpallewar7125]

Thank you ma'am, was waiting for this video...

[@CodeDecode]

Hope it helps :)

[@manoharsitaram3300]

I think from java 1.7 onwards we can provide only try block also. Or may be it is possible when we are using try with resource . Can you please confirm that by looking into it once.

[@CodeDecode]

That's with try with resources. As said in the video I Will cover that in part 2

[@PinakGanguly12rocks]

Thanks for such a great video.Request you to also make a intermediate level Exception handling interview video content.

[@CodeDecode]

sure we will create video on it soon

[@sushmakolli1119]

Please make exception handling part 2 video with advanced concepts like Exception chaining,try with multiple resources.

[@CodeDecode]

Sure Shushma 🙂🙂👍👍

[@revansiddappapanchal2068]

your voice is awesome

[@CodeDecode]

👍

[@mnishi2780]

Great content...They r really helpful...Concept is very clear...U r sharing ur knowledge with us...It is appreciable madam...Thanks alot ...pls upload advanced exception handling interview questions

[@CodeDecode]

Sure Nishi, we will upload them soon 👍🙃

[@saisybase]

Thank you very much

[@CodeDecode]

You are welcome..

[@EncryptoG]

Please upload interview questions of exception handling, Thank you.

[@CodeDecode]

Sure will upload soon 👍

[@GauravKawatrakir]

@@CodeDecode waiting for other set questions mam, please upload.

[@pritikumari153]

it is finalize() method not block.

[@suniltammineni1140]

Can you please make a video about advance lavel of exception handling questions

[@CodeDecode]

Sure 👍

[@heenakouser7733]

Thank you so much maam

[@CodeDecode]

You're Welcome Heena....

[@koushikratnagiri903]

Please cover the intermediate and advanced also

[@Parni_Stories]

Pls do vedio on juit mockito

[@CodeDecode]

sure anuradha will create it soon

[@ekaterina6666]

SPEAK SLOWER!!!!

[@CodeDecode]

Sure we will reduce our pace in upcoming videos. Thanks for your feed back

[@chenchaiahmalli6234]

Very nice and clear explanation Mam...Its very helpful...Keep it up.

[@CodeDecode]

Thanks 👍

[@ankitabagde6421]

Thanks for the vedio it very helpful. Can you please create the same for custom exception?

[@CodeDecode]

Sure 👍

[@mohitgharate8171]

Please upload videos on advance exception handling and try with resources

[@CodeDecode]

Sure 👍

[@ma8969]

Thank you so much

[@CodeDecode]

You're welcome

[@raghurambodapati6769]

Hi, your interview questions are very good and helpful, I want you to make an video on Generics concept and also on Java 8 feature interview questions

[@CodeDecode]

sure in next video i will capture java 8 interview questions

[@Joe-qv2jo]

Do you have any courses. Plz reply.

[@shrutigupta-pl2mi]

Hi Mam, In a lot of interviews I have been asked how to handle "Out Of Memory Error" through JVM or if suddenly the application suddenly starts throwing "Out Of Memory Error" then how will you clear the garbage memory? Can you please help me with this query by giving answer.

[@CodeDecode]

Yes. To prevent out of memory you must create more of local variabless rather than instance variables so that they can be garbage collected. You must nullify objects that are not more in your use so that they can also be garbage collected. Basic answer is to call garbage collector so as to prevent out of memory exception.

[@CodeDecode]

Please have a look at
th-cam.com/video/EeRFOVMf7rE/w-d-xo.html
And it's second part to have more clarity on the same

[@nirmalvaidhyanathanr1299]

Explanation is very good and please upload advanced exception handling questions

[@CodeDecode]

Sure 👍

[@AvinashKumar-ps8wl]

Please , upload exception handling advanced and intermdiate level questions with "Exception handling in spring boot applications " . This is mostly asked question in the interviews .

[@CodeDecode]

Yes I m planning to upload this soon. Thanks for the topic. 👍

[@shubhamnayak668]

Can make advance level and mid level interview question for exception

[@CodeDecode]

Sure will upload soon

[@hansirawat9322]

Thanks for sharing.

[@abhijeetw693]

Yes,plz create video on try with resource

[@CodeDecode]

sure we will create it soon

[@start1learn-n171]

Tq

[@CodeDecode]

Welcome

[@AbhishekRajurkar]

Finalize() is a method**

[@hemashilpa3954]

Great content..please upload advanced level exception handling interview questions

[@CodeDecode]

Sure Hema 👍👍

[@prateetisingha6729]

Please upload more questions of exception handling.

[@CodeDecode]

Sure 👍

[@sachinjadhav8759]

thank you

[@CodeDecode]

🙂🙂

[@aayushiagarwal3663]

Thank you for such good videos.
I have watched your other java videos which came out useful for me

[@CodeDecode]

Thanks for the nice words 👍

[@sureshgarine]

thank you madam, please continue advanced questions on exception handling

[@CodeDecode]

Sure Suresh 👍👍

[@prikansiyadav436]

Your explanation is really very helpful ❤️
Thank you so much

[@CodeDecode]

Thanks 👍👍

[@philipdodson7870]

Great video, my only feedback is that to say final variable cannot be changed is misleading as final variables can still be mutated

[@CodeDecode]

Thanks. Ohh but Except inside constructor, how can we change/ instantiate it's value?

[@priyapandian8655]

Very useful and I like to get some advanced question in exception also

[@CodeDecode]

Sure will make part 2 soon

[@akshaybobade2881]

yes please

[@CodeDecode]

👍👍

[@jayalaxmirn9820]

excellent content. But can you please create videos for experienced people with more advanced concepts?

[@CodeDecode]

Sure it's already uploaded on channel Jayalaxmi. You need link or you can surf channel??

[@jayalaxmirn9820]

@@CodeDecode Can you please send me the link?

[@nandasagar3973]

thank u

[@CodeDecode]

You're welcome nanda ....

[@bharatahirwar2252]

at the end ,you mentioned finally is key word , and finalize is a block , which is wrong statements,
Except this you explained nicely,
Awesome explanation.
pls try to cover all topics for interview perspective.

[@dileepnb01]

Final is a keyword
Finally is a block
Finalize is a method
Is it correct now?

[@vishalkadam7728]

14.20 timestamp ...checked exception can be propagated using throw

[@praveenraj3721]

this video is very helpful and as you said you need to extend this video to intermediate and advanced level.

[@CodeDecode]

Sure will make it soon

[@Bhavdip2011]

Give complete tutorials on THREAD

[@CodeDecode]

Sure will create videos on multi threading soon

[@priyankaraut9289]

Can u please upload interview questions on rest Webservices and spring n springboot

[@CodeDecode]

Sure. Next spring boot interview questions are lined up

[@shankarpatilsp]

Thank You so much Ma'am..!!

[@CodeDecode]

your welcome 👍

[@lavsharma3441]

Nice and easy explanation Thanks ma'am

[@CodeDecode]

Thanks 🙂👍

[@kazaasekhar]

thank you very good explaination

[@CodeDecode]

You are welcome!

[@josephkumar8259]

Thank you for the video. Can we handle all the exceptions with the parent class Exception...??

[@CodeDecode]

Yes you can but it's not a good practice.

[@josephkumar8259]

@@CodeDecode Ok. Thank you.

[@jayhoeliotdecabrio4050]

where is the part 2

[@vibhorgoel4614]

Outstanding work done... Watching all your videos for learning. Expecting more soon.. Good Job

[@CodeDecode]

Sure will upload more soon.

[@CodeDecode]

Thanks

[@Ss_Sl]

Yes we want advanced level please try a video

[@CodeDecode]

Sure will upload that soon

[@Bhavdip2011]

Give more videos on DS and Algorithms

[@CodeDecode]

Sure once will complete this will start with data structures

[@keerthu7055]

Great mam

[@CodeDecode]

Thanks