@Override public List refreshTicks(Graphics2D g2,AxisState state,Rectangle2D dataArea,RectangleEdge edge){
  return Collections.EMPTY_LIST;
}

@ Override public List refreshTicks ( Graphics2D g2 , AxisState state , Rectangle2D dataArea , RectangleEdge edge ) { return Collections . EMPTY_LIST ; }
calculates the positions of the ticks for the axis , storing the results in the tick list ( ready for drawing ) .
