1  import java.awt.Rectangle;

  2  

  3  /**

  4     This program demonstrates the use of an inner class.

  5  */

  6  public class DataSetTester3

  7  {

  8     public static void main(String[] args)

  9     {

 10        class RectangleMeasurer implements Measurer

 11        {

 12           public double measure(Object anObject)

 13           {

 14              Rectangle aRectangle = (Rectangle) anObject;

 15              double area 

 16                    = aRectangle.getWidth() * aRectangle.getHeight();

 17              return area;

 18           }

 19        }

 20  

 21        Measurer m = new RectangleMeasurer();

 22  

 23        DataSet data = new DataSet(m);

 24  

 25        data.add(new Rectangle(5, 10, 20, 30));

 26        data.add(new Rectangle(10, 20, 30, 40));

 27        data.add(new Rectangle(20, 30, 5, 15));

 28  

 29        System.out.println("Average area: " + data.getAverage());

 30        System.out.println("Expected: 625");

 31  

 32        Rectangle max = (Rectangle) data.getMaximum();

 33        System.out.println("Maximum area rectangle: " + max);

 34        System.out.println("Expected: " 

 35           + "java.awt.Rectangle[x=10,y=20,width=30,height=40]");

 36     }

 37  }