/*
 *  ======================================================================
 *  TestShape.java : Demonstrate use of abstract class for shapes.
 *                   Subclass Shape with class Rectangle and class Circle.
 * 
 *  Written by Mark Austin                                     March, 2000
 *  ======================================================================
 */

import java.lang.Math;

// Location of a point ( dX, dY).

class Location {
      double dX, dY;
}

// Abstract class of Shapes 

abstract class Shape {
      Location c = new Location();

      public abstract String toString();
      public abstract double perimeter();
}

// Class of Rectangles.

class Rectangle extends Shape {
      double dSide1, dSide2;

      // Rectangle constructor .....
   
      public Rectangle ( double dSide1, double dSide2,
                         double dX,     double dY ) {

            this.dSide1 = dSide1;
            this.dSide2 = dSide2;

            c.dX = dX;
            c.dY = dY;
      }

      public String toString() {
            return "Rectangle : Side1 = " + dSide1 +
                              " Side2 = " + dSide2 ;
      }

      public double perimeter() {
            return 2.0*(dSide1 + dSide2);
      }
}

// Class of Circles.

class Circle extends Shape {
      double dDiameter;

      // Circle constructor ....
   
      public Circle ( double dDiameter, double dX, double dY ) {
            this.dDiameter = dDiameter;
            c.dX = dX;
            c.dY = dY;
      }

      public String toString() {
            return "Circle : Diameter = " + dDiameter +
                             " [x,y] = ["+ c.dX + "," + c.dY + "]";
      }

      public double perimeter() {
            return Math.PI*dDiameter*dDiameter/4.0;
      }
}

public class TestShape {
      public static void main ( String args[] ) {

            Shape s[] = new Shape [2] ;

            s[0] = new Rectangle( 2.0, 2.0, 2.0, 2.0 );
            s[1] = new    Circle( 2.0, 2.0, 2.0 );

            // Print details of the array of shapes 

            for (int ii = 1; ii <= s.length; ii = ii + 1) {
                 System.out.println(  s[ii-1].toString() );
                 System.out.println( "Perimeter = " + s[ii-1].perimeter() );
            }
      }
}