Initialize final variable within constructor in another method

Question

I have a problem which isn\'t really that big, but still gives me some thought as to how Java constructors and methods are used.

I have a constant representing a rad

Answer 1

How about (using small caps for radius, because it is not a constant, as pointed out in the comments):

public MyProblematicClass(... variables ...) {
    radius = getRadiusWithCriteria(criteria);
}

private int getRadiusWithCriteria(criteria crit) {
   if(... crit ...) {
      return n;
   } else {
      return 0;
   }
}