1  import java.awt.Rectangle;

  2  

  3  /**

  4     This program demonstrates the use of a Measurer.

  5  */

  6  public class MeasurerTester

  7  {

  8     public static void main(String[] args)

  9     {

 10        class AreaMeasurer implements Measurer

 11        {

 12           public double measure(Object anObject)

 13           {

 14              Rectangle aRectangle = (Rectangle) anObject;

 15              double area = aRectangle.getWidth() * aRectangle.getHeight();

 16              return area;

 17           }

 18        }

 19  

 20        Measurer areaMeas = new AreaMeasurer();

 21  

 22        Rectangle[] rects = new Rectangle[] 

 23           {

 24              new Rectangle(5, 10, 20, 30),

 25              new Rectangle(10, 20, 30, 40),

 26              new Rectangle(20, 30, 5, 15)

 27           };

 28  

 29        double averageArea = Data.average(rects, areaMeas);

 30        System.out.println("Average area: " + averageArea);

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

 32     }

 33  }