Class Poly (The Application)
	public class Poly {     private Polyhedron p1, p2, p3;     public static void main(String [] argv) {         Poly thisApp = new Poly();         thisApp.p1 = new Cube(5);         thisApp.p2 = new Tetrahedron(10, 8, 7);         thisApp.p3 = new RectangularParallelopiped(2, 3, 4);         thisApp.p1.describe();         thisApp.p2.describe();         thisApp.p3.describe();     } }