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

Even though answers here are correct in general, there's one point that is not mentioned.

"" + intVar has better performance compared to String.valueOf() or Integer.toString(). So, if performance is critical, it's better to use empty string concatenation.

See this talk by Aleksey Shipilëv. Or these slides of the same talk (slide #24)