java 比较器

 public static class DistanceComparator implements
   Comparator<PointInformation> {
  public int compare(PointInformation element1, PointInformation element2) {
   float distance1 = element1.distance;
   float distance2 = element2.distance;
   return new Float(distance2).compareTo(distance1);
  }
 }
[7/8/2011 4:24:00 PM] Damien Dai:   // ordered the point with distance by decrease
  DistanceComparator comp = new DistanceComparator();
  Collections.sort(mOriginalPoints, comp);