TIOBE - Java Coding Standard

Rule: Optimization1

Synopsis:	Local variables assigned only once can be declared final
Language:	Java
Severity Level:	4
Category:	Optimization

Description:

A local variable assigned only once can be declared final.

public class Bar {
 public void foo () {
  String a = "a"; //if a will not be assigned again it is better to do this:
  final String b = "b";
 }
}