String valueOf vs concatenation with empty string

Question

I am working in Java code optimization. I\'m unclear about the difference between String.valueOf or the +\"\" sign:

int intVar = 1;         


        

Answer 1

String strVar1 = intVar+"";
String strVar2 = String.valueOf(intVar);

strVar1 is equvalent to strVar2, but using int+emptyString "" is not elegant way to do it.

using valueOf is more effective.