order.java

ssd3 exercise4正确的

import java.util.*;
import java.text.*;

/**
 * Maintains a collection of {@link OrderItem}
 * assigned to a buyer.
 *
 * @author XuWeiyue
 * @version  1.0.0
 * @see OrderItem
 */
public class Order 
{


	/* Catalog items assigned to a buyer.*/
	private Vector  items;

	/**
	 * Sets the collection of {@link OrderItem} to empty.
	 */
	public Order()  
	{

		items = new Vector();
	}

	/**
	 * Adds a {@link CatalogItem} object to this collection and
	 * sets the {@link CatalogItem} object as not available.
	 *
	 * @param item  the {@link CatalogItem} object.
	 */
	public void  addItem(OrderItem orderItem)  
	{

		items.add(orderItem);
	}

	/**
	 * Removes a {@link CatalogItem} object from this collection
	 * and sets the {@link CatalogItem} object as available.
	 *
	 * @param item  the {@link CatalogItem} object.
	 */
	public void  removeItem(OrderItem orderItem)  
	{

		items.removeElement(orderItem);
	}

	/**
	 * Returns an iterator over the borrowed items in this
	 * collection.
	 *
	 * return  an {@link Iterator}
	 */
	public Iterator  getItemsIterator() 
	{

		return items.iterator();
	}

	/**
	 * Returns the {@link CatalogItem} object with the specified
	 * <code>code</code>. 
	 *
	 * @param code  the code of an item.
	 * @return  The {@link CatalogItem} object with the specifed
	 *          code. Returns <code>null</code> if the object with
	 *          the code is not found.
	 */
	public OrderItem getItem(Product product)
	{

		for (Iterator i = getItemsIterator(); i.hasNext();) 
		{

			OrderItem orderItem = (OrderItem) i.next();

			if (orderItem.getProduct().equals(product)) 
			{

				return orderItem;
			}
		}

		return null;
	}

	/**
	 * Returns the number of borrowed items.
	 *
	 * @return  the number of borrowed items.
	 */
	public int  getNumberOfItems()  
	{

		return items.size();
	}
	
	public double getTotalCost()
	{
		double d = 0.0D;
		for(Iterator i = getItemsIterator(); i.hasNext();)
		{
			d += ((OrderItem)iterator.next()).getValue();
		}

		return d;
	}

}