/**
   A decorator for an item that applies a discount.
*/
public class DiscountedItem implements LineItem
{
   /**
      Constructs a discounted item.
      @param item the item to be discounted
      @param discount the discount percentage
   */
   public DiscountedItem(LineItem item, double discount) 
   { 
      this.item = item; 
      this.discount = discount;
   }

   public double getPrice() 
   {
      return item.getPrice() * (1 - discount / 100); 
   }

   public String toString()
   {
      return item.toString() + " (Discount " + discount
         + "%)";
   } 

   private LineItem item;
   private double discount;
}