Var keyword in java?

Question

What is the use of var keyword in Java?I learnt Java 8 but it is introduced in Java 10 and I am feeling rusty in Java....So PLZZ tell where var can be used ..I used to declare instance variables but it says var not allowed here....
https://code.sololearn.com/c63XWiQy8kkJ/?ref=app

Answer 1

Remove line 2: var b = 4 (or add it after the main method)
var b = 2 --> the compiler treats b as an integer. I have not worked with the var keyword yet, so I can not much say about it.
Maybe this article helps: https://developers.redhat.com/blog/2018/05/25/simplify-local-variable-type-definition-using-the-java-10-var-keyword/

Answer 2

Var is neither a keyword nor a data type
After class we declare our instance variables
→Data_type variable_name;
for example
int i;
So var can not be used here to declare instance variable b
Instead u can use
int b;

Answer 3

I have made an example code:

https://code.sololearn.com/c5Ypf1x9W1E8/?ref=app

you can use var instead of the datatypes. I'm not sure what happens when var is an object.

Edit: I added a Test Class --> var t = new Test();

Answer 4

In 5th line in the website I sent to u there is written that its not really a keyword

Answer 5

Ankit Yadav Saksham Jain I think var is in a grey area. It is not declared as a keyword: var var = 7 is possible (int int = 7 is not possible). But it is like a keyword. I think it has to do that you can use var only for local variables, but I'm not sure.

Answer 6

U can visit here
https://dzone.com/articles/finally-java-10-has-var-to-declare-local-variables

Answer 7

Ankit Yadav if var is not a keyword then what is it?

Answer 8

Denise Roßberg why declaring instance variables by var doesn't work?

Answer 9

Ankit Yadav thanks for the link but it is a keyword.