/**
 * Computes the average and maximum of a set of data values
 */
public class DataSet
{
   private Measurable [] list ;

   /**
    * Creates a DataSet object
    * @param objects an array of Measurable objects
    */
   public DataSet(Measurable [] objects)
   {
      list = objects ;
   }

   /**
    * Gets the average measure of all objects in the list
    * @return the average or 0 if no data has been added
    */
   public double getAverage()
   {
      return Measurable.getAverage(list) ;    // calls static method
   }

   /**
    * Returns a pointer to the Measurable object with the largest measure in
    * the list
    * @return a pointer to object with the largest measure or null if the
    * the list is empty
    */
   public Measurable getMaximum()
   {
      // if list is empty, nothing to return
      if (list.length == 0) return null ;
      
      Measurable max = list[0] ;                
      for (Measurable nextObj : list)
      {
         if (nextObj.isGreaterThan(max))     // calls default method
         {
            max = nextObj ;
         }
      }
      return max ;
   }
}