Difference between String.valueOf(long a) and concatenating ("" + a)

Question

Which approach is better and why ?

If I write

cmissValue = String.valueOf(callDBDatasource.cMiss());

or

cmissValue = "" + callDBDatasource.cMiss();

What should be the approach?

Answer 1

"" + callDBDatasource.cMiss();

Will compile to:

new StringBuilder().append("").append(callDBDatasource.cMiss()).toString();

This will create a new object and is therefore significantly slower. See this question: Is string concatenaion really that slow?

Answer 2

This will be useful here (section "Converting numbers to Strings"): http://www.odi.ch/prog/design/newbies.php

Shortly:

    String.valueOf(callDBDatasource.cMiss());