TIOBE - Java Coding Standard

Rule: StringandStringBuffer12

Synopsis:	No need to call String.valueOf to append to a string
Language:	Java
Severity Level:	3
Category:	StringandStringBuffer

Description:

No need to call String.valueOf to append to a string; just use the valueOf() argument directly.

public String convert(int i) {
  String s;
  s = "a" + String.valueOf(i); // Bad
  s = "a" + i; // Better
  return s;
}