order = (ItemOrder)itemsOrdered.elementAt(i);

      if (order.getItemID().equals(itemID)) {

        if (numOrdered <= 0) {

          itemsOrdered.removeElementAt(i);

        } else {

          order.setNumItems(numOrdered);

        }

        return;

      }

    }

    ItemOrder newOrder =

      new ItemOrder(Catalog.getItem(itemID));

    itemsOrdered.addElement(newOrder);

  }

}

Listing 9.7 Item.java 

package coreservlets;

/** Describes a catalog item for on line store. The itemID

 *  uniquely identifies the item, the short description

 *  gives brief info like the book title and author,

 *  the long description describes the item in a couple

 *  of sentences, and the cost gives the current per item price.

 *  Both the short and long descriptions can contain HTML

 *  markup.

 */

public class Item {

  private String itemID;

  private String shortDescription;

  private String longDescription;

  private double cost;

Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.

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