Should constructor parameters be declared final

Question

I have seen codes where function parameters have been declared final. Surprisingly not seen code with constructor parameters declared final.

Eg:

public class Foo {

   public Foo(final int day, final int month, final int year) {
    ...
   }
}

Why is this not common ? Is there a concrete reason or just that fact that code becomes verbose ?

Answer 1

There are times when you have to declare them final:

public class Test {
  final Runnable runner;

  public Test(final String text) {
    runner = new Runnable () {
      @Override
      public void run () {
        System.out.println("Run: "+text);
      }
    };
  }
}

but generally you don't have to and IMHO it is just an unnecessary distraction.