/** Compare this ratio to object and return -1 if this is less than object,
* 1 if this is greater than object, or zero if they are equal.
*
* @throws ClassCastException if object is not an IntRatio or Rational.
*/
public int compareTo(Object obj)
{
if (obj is Rational)
{
// We know Rational.compareTo will call IntRatio on its
// own copy of an IntRatio, so use that.
// We are reversing the order of the compare, so reverse the result.
return(-((Rational)obj).compareTo(this));
}
// This will throw the ClassCastException if the object is not IntRatio
IntRatio r = (IntRatio)obj;
// Make sure they are simplified and do the quick Equals check first.
simplify();
r.simplify();
if (n == r.n && d == r.d)
{
return(0);
}
// Do this similar to sub, but we are only interested in the numerator.
// (Since they are simplified, the denominators are positive.
if ((n * r.d - r.n * d) < 0)
{
return(-1);
}
else
{
return(1);
}
}