exe4.html

卡耐基课程练习

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<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>
  </li></ul>
  <p> <b><i>Goals:</i></b> Reinforce your ability to implement classes that use 
    collections
</p><p> <b><i>Outcomes:</i></b> You
    will demonstrate mastery of the following: 
  </p><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 border="0" cellpadding="2" cellspacing="2" width="75%">
  <tbody><tr>
      <td><img src="/content/SSD/SSD3/4.2.0.1/normal/pg-class-imp/pg-collctns/assm-exer-impl-collctns/pool-pr-impl-collctns/qn-pr-collctns-cof-gou-sys/handout/images/coll-cof-gou-sys.jpg" alt="Figure 1 Gourmet Coffee System class diagram" height="558" width="621"></td>
  </tr>
  <tr>
      <td><b>Figure 1 </b><i>Gourmet Coffee System class diagram</i></td>
  </tr>

</tbody></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&lt;Product&gt;</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&lt;Product&gt; 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&lt;OrderItem&gt;</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&lt;OrderItem&gt; 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&lt;Order&gt;</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>

  <li> <code><em>public Sales()</em></code> — Creates the collection <code>orders</code>, 
    which is initially empty.</li>
</ul>
<ul>
  <li> <code><em>public void addOrder(Order order)</em></code> — Adds the specified 
    order to the collection <code>orders</code>.</li>

</ul>
<ul>
  <li> <code><em>public Iterator&lt;Order&gt; iterator()</em></code> — Returns an iterator 
    over the instances in the collection <code>orders</code>.</li>
</ul>
<ul>
  <li> <code><em>public int getNumberOfOrders()</em></code> — Returns the number 
    of instances in the collection <code>orders</code>.</li>

</ul>
<h4>Class <code>GourmetCoffee</code></h4>
<p>The class <code>GourmetCoffee</code> creates a console interface to process store orders.  Currently, it includes 
    the complete implementation of some of the methods. The methods <code>displayNumberOfOrders</code> and <code>displayTotalQuantityOfProducts</code> are incomplete and should be implemented. The following is a screen shot of the interface:</p>
<blockquote>
	<table border="0" cellpadding="2" cellspacing="2" width="54%">

	  <tbody><tr>
		  
		
      <td><img src="/content/SSD/SSD3/4.2.0.1/normal/pg-class-imp/pg-collctns/assm-exer-impl-collctns/pool-pr-impl-collctns/qn-pr-collctns-cof-gou-sys/handout/images/exe-gourmet-coffee.jpg" alt="Figure 2 Execution of GourmetCoffee" height="149" width="430"></td>
	  </tr>
	  <tr>
		  
		<td><b>Figure 2</b> <i>Execution of GourmetCoffee</i></td>
	  </tr>
	</tbody></table>

</blockquote>
<p><em>Instance variables:</em></p>
<ul>
  <li><code><em>catalog</em></code> — A <code>Catalog</code> object with the products that can be sold.</li>
  <li><code><em>currentOrder</em></code> — An <code>Order</code> object with the information about the current order.</li>

  <li><code><em>sales</em></code> — A <code>Sales</code> object with  information about all the orders sold by the store.</li>
</ul>
<p><em>Constructor and public methods:</em></p>
<ul>
  <li> <code><em>public GourmetCoffeeSolution()</em></code> — Initializes the attributes <code>catalog</code>, <code>currentOrder</code> and <code>sales</code>. This constructor is complete and  should not be modified.</li>