/*
 *  =========================================================
 *  Definition of class Point : A point is represented by its
 *                              (x,y) coordinates.
 * 
 *  Written By : Mark Austin                     October 1997 
 *  =========================================================
 */

public class Point {
   protected double dX, dY; // (x,y) coordinates of the Point

   // Constructor method : just create instance of class.

   public Point() { }

   // Create instance of class and set (x,y) coordinates.

   public Point( double dX, double dY ) {
      setPoint( dX, dY );
   }

   // Set x and y coordinates of Point.

   public void setPoint( double dX, double dY ) {
      this.dX = dX;
      this.dY = dY;
   }

   // Get x and y coordinates.

   public double getX() { return dX; }  
   public double getY() { return dY; }

   // Convert the point into a String representation

   public String toString() 
      { return "[" + dX + ", " + dY + "]"; }

   // Exercise methods in point class.

   public static void main( String args[] ) {
   double dX, dY;

      System.out.println("Point test program");
      System.out.println("===============================");

      // Create two new points.

      Point point1 = new Point();
      point1.setPoint( 1.0, 1.0 );
      Point point2 = new Point( 1.5, 4.5 );

      // Print (x,y) coordinates of points.

      System.out.println("Point 1 : " + point1.toString() );
      System.out.println("Point 2 : " + point2.toString() );

      // Get x and y coordinates.

      dX = point1.getX(); dY = point1.getY();
      System.out.println("Point 1 : X coordinate = " + dX );
      System.out.println("          Y coordinate = " + dY );
      dX = point2.getX(); dY = point2.getY();
      System.out.println("Point 2 : X coordinate = " + dX );
      System.out.println("          Y coordinate = " + dY );

      System.out.println("===============================");
      System.out.println("End of Point test program");
   }
}