/** Inheritance demo.
    @author Jed Yang, 2018-01-10
*/
public class Rectangle extends Shape
{
   // instance variables, private
   private String name;
   private int width;
   private int height;

   public Rectangle(String name, int width, int height)
   {
      this.name = name;
      this.width = width;
      this.height = height;
   }

   public Rectangle()
   {
      this("rectangle", 2, 5);
   }

   public double getArea()
   {
      return width * height;
   }

   public double getPerimeter()
   {
      return 2 * width + 2 * height;
   }

   // Often automatically called.  Like Python's __str__ magic method.
   public String toString()
   {
      return name + " of width " + width + " and height " + height;
   }
}