What method should I use to convert an int to a String?

Question

I know that String.valueOf(int) enables caching and often does not cause an extra object to be created, but does ("" + 1) get some kind of compiler optimization?

Which one should be used?

EDIT: String.valueOf(int) does not enable caching, Integer.valueof(int) does.

Answer 1

Using String.valueOf(int) is reasonable optimal for the application.

""+i may be more optimal for you and unless you have loads of time and a resource limited device, saving your time may be more valuable than saving a micro-second of CPU time.

Answer 2

"" + 1 is a bad habit in my opinion and as far as I know it is not optimized in any way.

Do stick with String.valueOf(int).

Answer 3

No, String.valueOf doesn't perform any caching. However, it's more readable than "" + 1 (which also doesn't perform any caching) because it says what you want to do.

"" + 1 talks about string concatenation and an empty string, neither of which have anything to do with your aim - which is to get the value of an integer, as a String.

String.valueOf says exactly what you want to do, so use that.

Answer 4

Choose explicit conversions over implicit ones.

String.valueOf(int) tells you exactly what it is doing.

Although, I always use Integer.toString(int) because I read this as the toString method for a primitive int.

Answer 5

They are both equivalent and it is more a matter of personal taste. Personally, I prefer String.valueOf(int).