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<span class=dialogueheader>Take Assessment: Exercise 4</span><br><br>
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<span class=instructions >Please answer the following question(s).<br>If the assessment includes multiple-choice questions, click the "Submit Answers" button when you have completed those questions.</span></td>
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<span class=highlight-label >1.</span></td>
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<td width=5><br></td> <td valign=top class=td0_x align=left > <!-- new pg 042903 ici -->
<h2 align="center">Implementing the Collections in the Gourmet
Coffee System </h2>
<h3>Prerequisites, Goals, and Outcomes</h3>
<blockquote> <b><i>Prerequisites:</i></b> Before you begin this exercise, you
need mastery of the following:
<ul>
<li> <em>Collections</em>
<ul>
<li>Use of class <code>ArrayList</code></li>
<li>Use of iterators</li>
</ul>
</ul>
<p> <b><i>Goals:</i></b> Reinforce your ability to implement classes that use
collections
<p> <b><i>Outcomes:</i></b> You
will demonstrate mastery of the following:
<ul>
<li>Implementing a Java class that uses collections</li>
</ul>
</blockquote>
<h3>Background </h3>
<p>In this assignment, you will implement the classes in
the <em>Gourmet Coffee
System</em> that use collections.</p>
<h3>Description</h3>
<p>The following class diagram of the <em>Gourmet Coffee System</em> highlights
the classes that use collections:</p>
<blockquote>
<table cellpadding="2" width="75%" cellspacing="2" border="0">
<tr>
<td><img src="coll-cof-gou-sys.jpg" alt="Figure 1 Gourmet Coffee System class diagram"></td>
</tr>
<tr>
<td><b>Figure 1 </b><i>Gourmet Coffee System class diagram</i></td>
</tr>
</table>
</blockquote>
<p>Complete implementations of the following classes are provided in the student
archive:</p>
<ul>
<li><code>Coffee</code></li>
<li><code>CoffeeBrewer</code></li>
<li><code>Product</code></li>
<li><code>OrderItem</code></li>
<li><code>GourmetCoffee</code></li>
</ul>
<p>In this assignment, you will implement the following classes:</p>
<ul>
<li><code>Catalog</code></li>
<li><code>Order</code></li>
<li><code>Sales</code></li>
<li><code>GourmetCoffee</code></li>
</ul>
<p>The class specifications are as follows:</p>
<h4>Class <code>Catalog</code></h4>
<p>The class <code>Catalog</code> models a product catalog. This class implements the interface <code>Iterable<Product></code> to being able to iterate through the products using the <code>for-each</code> loop.</p>
<p><em>Instance variables:</em></p>
<ul>
<li><code><em>products</em></code> — An <code>ArrayList</code> collection that contains references to instances
of class <code>Product</code>.</li>
</ul>
<p><em>Constructor and public methods:</em></p>
<ul>
<li> <code><em>public Catalog()</em></code> — Creates the collection <code>products</code>,
which is initially empty.</li>
</ul>
<ul>
<li> <code><em>public void addProduct(Product product)</em></code> — Adds the
specified product to the collection <code>products</code>.</li>
</ul>
<ul>
<li> <code><em>public Iterator<Product> iterator()</em></code> — Returns an
iterator over the instances in the collection <code>products</code>.</li>
</ul>
<ul>
<li> <code><em>public Product getProduct(String code)</em></code> — Returns a
reference to the <code>Product</code> instance with the specified code. Returns
<code>null</code> if there are no products in the catalog with the specified
code. </li>
</ul>
<ul>
<li> <code><em>public int getNumberOfProducts()</em></code> — Returns the number
of instances in the collection <code>products</code>.</li>
</ul>
<h4>Class <code>Order</code></h4>
<p>The class <code>Order</code> maintains a list of order items. This class implements the interface <code>Iterable<OrderItem></code> to being able to iterate through the items using the <code>for-each</code> loop.</p>
<p><em>Instance variables:</em></p>
<ul>
<li><code><em>items</em></code> — An <code>ArrayList</code> collection that contains references to instances
of class <code>OrderItem</code>.</li>
</ul>
<p><em>Constructor and public methods:</em></p>
<ul>
<li> <code><em>public Order()</em></code> — Creates the collection <code>items</code>,
which is initially empty.</li>
</ul>
<ul>
<li> <code><em>public void addItem(OrderItem orderItem)</em></code> — Adds the
specified order item to the collection <code>items</code>.</li>
</ul>
<ul>
<li> <code><em>public void removeItem(OrderItem orderItem)</em></code> — Removes
the specified order item from the collection <code>items</code>.</li>
</ul>
<ul>
<li> <code><em>public Iterator<OrderItem> iterator()</em></code> — Returns an iterator
over the instances in the collection <code>items</code>.</li>
</ul>
<ul>
<li> <code><em>public OrderItem getItem(Product product)</em></code> — Returns
a reference to the <code>OrderItem</code> instance with the specified product.
Returns <code>null</code> if there are no items in the order with the specified
product.</li>
</ul>
<ul>
<li> <code><em>public int getNumberOfItems()</em></code> — Returns the number
of instances in the collection <code>items</code>.</li>
</ul>
<ul>
<li> <code><em>public double getTotalCost()</em></code> — Returns the total cost
of the order. </li>
</ul>
<h4>Class <code>Sales</code></h4>
<p>The class <code>Sales</code> maintains a list of the orders that have been
completed. This class implements the interface <code>Iterable<Order></code> to being able to iterate through the orders using the <code>for-each</code> loop.</p>
<p><em>Instance variables:</em></p>
<ul>
<li><code><em>orders</em></code> — An <code>ArrayList</code> collection that contains references to instances
of class <code>Order</code>.</li>
</ul>
<p><em>Constructor and public methods:</em></p>
<ul>
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