NULL & NullPointerException | Java Tutorial | By Mr.Hari Krishna

Java Tutorial: By Mr.Hari Krishna
Core Java Course Topic: NULL & NullPointerException

Welcome to the Core Java Tutorial Series! In this video, we introduce the essential concepts of Core Java and guide you through building a strong foundation in Java programming. Perfect for beginners and those refreshing their Java skills!

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Please write back to us at

[HateAcceptedButThinkAgain]

How many of you guys did catch the motto behind this assignment..?
When you assign int i1 = "HK"; you get a compile time error saying "String can't be converted to int". It means that literal "HK" is of String type.
But, when you assign int i2 = null; compiler doesn't show error like "Object can't be convetred to int" instead it says "<null> can't be converted to int", Which proves that stand-alone null literal isn't of any specific type, but it can be assigned to any reference-type.

[tappu]

Sir, I am a student of you.
I likes your teaching style because you always teaching us not like a faculty but teach us how can we understand i.e the very powerful inspirational part of a faculty.
So upload these types of concepts videos which will help us in future.
Thank you NiT

[ThePratapunique]

I have taken coaching in 2006, One of the best Java faculties @ Ameerpet with in-depth knowledge transfer of all Java concepts, students gain more knowledge than working professionals.I was able to get a job soon after graduation bcoz of his coaching. students with zeal, patience, consistence, persistence can blindly take his coaching.

[Coder_Mama]

Sir, the day I started attending your class, from that onwards, I am fan of you like anything. Now I am working in a MNC, my manager always appreciate my code..

[solotravelerrk]

Nice sir... When I was watching this video.. I am feeling like now I'm in class... Thanks sir for provide this videos ...

[harshalkadu]

the next topic operation performed using null i cant able to find out????

[airaaira]

thank sir giving a such type confidence to the students
I really like that way teach u
in fact I'm a non it student iam never facing any difficulty in learning Java this is only because of u

[WriteCodeWithPrince]

Very nice video sir i am proud of you.

I am from bihar motihari jila.

Thanks u for upload this video

To teach

[sranjithkumar]

you are great sir any faculty is after you, you will inject the concept in many ways for us, you will entertaining class according to subject thank you sir

[arunpratapsingh]

Thank you sir toady I got null & nullPointerException concept really very good
Thanks again sir

[Vijay-csuy]

He is great person and his strategy is very good to learn java.So many people got job because you i am also one of them thank you Hari sir. Don't display your contact information many times in between session it will disturbs you can display in the beginning of session or in the end of the session.

[mayurkumar]

sir, the way you teach and the way you inject the concepts is really friendly..
thank you very much sir..sir we are eagerly waiting for JVM architecture videos

[jayeshpandey]

Thank you sir...wonderful explanation...i'm eagerly waiting for next video of this topic.

[MUKESHKUMAR-vhmb]

Enjoying sir as usual whenever i listen to you..such a wonderful explanation..Thank you sir.
incompatible types: <null> cannot be converted to int
int i1=null;
^
incompatible types: String cannot be converted to int
int i2="HK";
^

[nareshroyalzz]

Null is a any referenced type literal that type should be array, class, interface, enum, annotation.
Null used to avoid compile time errors. To assigning variable, using null but don't use directly at object level only we r using referenced type of null .

[rafishaik]

great explanation sir INT is a primitive data type thats why compile time error will be occurred

[gauravjava]

intruged to see him from online sessions much of my temptation is satisfy now

[srinivasvenkata]

sir, i really love your teaching in fact i am biggest fan to your lecture .

[jayeshpandey]

int i1=null;---->CE:incompatible types: <null> cannot be converted to int
int i2="HK"--->CE:incompatible types: String cannot be converted to int
sir, if String of referenced type can not be converted to primitive type int & also null of can not be converted to primitive type int.
here i wrote blank_space to fill the the type of <null>. So if you carefully observe in errors, you will get to know...<null> and String can not be converted to primitive type int and String belongs to referenced type so <null> is of referenced type...
Thanks.

[Sriram_Chhotaray]

thank u sir...nyc vdo....really you make it simple to understand d concept....waiting for the null pointer exception part....