FastFish Exercise Set 1 Question 4

protected ArrayList findMoveLocs()
{
  Environment env = environment();
  ArrayList emptyNbrs = emptyNeighbors();
  Direction oppositeDir = direction().reverse();

  ArrayList moveLocations = new ArrayList();
  for (int index = 0; index < emptyNbrs.size(); index++ )
  {
    Location neighborLoc = (Location) emptyNbrs.get(index);
    moveLocations.add(neighborLoc);

    Direction dirToNeighbor = env.getDirection(location(), neighborLoc);
    Location nextOver = env.getNeighbor(neighborLoc, dirToNeighbor);

    if (env.isEmpty(nextOver) && (! dirToNeighbor.equals(oppositeDir)))
    {
      moveLocations.add(nextOver);
    }
  }

  return moveLocations;
}