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

Using String.valueOf(int), or better, Integer.toString(int) is relatively more efficient for the machine. However, unless performance is critical (in which case I wouldn't suggest you use either) Then ""+ x is much more efficient use of your time. IMHO, this is usually more important. Sometimes massively more important.

In other words, ""+ wastes an object, but Integer.toString() creates several anyway. Either your time is more important or you want to avoid creating objects at all costs. You are highly unlikely to be in the position that creating several objects is fine, but creating one more is not.