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卡耐基课程练习

    </blockquote>
    <p>The fields are separated by an underscore ( <code>_</code> ). You can assume 
      that the fields themselves do not contain any underscores.</p>
  </li>
</ul>
<h4>Class <code>CoffeeBrewer</code></h4>
<p>Class <code>CoffeeBrewer</code> models a coffee
   brewer. It extends class <code>Product</code>.</p>

<p><em>Instance variables:</em></p>
<ul>
  <li><code><em>model</em></code>. The model of the coffee brewer<code></code></li>
  <li><code><em>waterSupply</em></code>. The water supply (<code><em>Pour-over</em></code> 
    or <code><em>Automatic</em></code>)</li>
  <li><code><em>numberOfCups</em></code>. The capacity of the coffee brewer<code></code></li>

</ul>
<p><em>Constructor and methods:</em></p>
<ul>
  <li> <pre>public CoffeeBrewer(String initialCode, 
                    String initialDescription, 
                    double initialPrice,
                    String initialModel,
                    String initialWaterSupply,
                    int initialNumberOfCups)</pre>
	<p>Constructor that initializes the instance variables <code>code</code>, <code>description</code>, 
    <code>price</code>, <code>model</code>, <code>waterSupply</code>, and <code>numberOfCups</code>.</p>

  </li>
</ul>
<ul>
  <li> <code><em>public String getModel()</em></code>. Returns the value of instance 
    variable <code>model</code>.</li>
</ul>
<ul>
  <li> <code><em>public String getWaterSupply()</em></code>. Returns the value 
    of instance variable <code>waterSupply</code>.</li>

</ul>
<ul>
  <li> <code><em>public int getNumberOfCups()</em></code>. Returns the value of 
    instance variable <code>numberOfCups</code>.</li>
</ul>
<ul>
  <li><code><em>String toString()</em></code>. Overrides the method <code>toString</code> 
    in the class <code>Object</code>. Returns the string representation of a <code>CoffeeBrewer</code> 
    object. The <code>String</code> returned has the following format: 
    <blockquote> 
      <pre><em>code</em>_<em>description</em>_<em>price</em>_<em>model</em>_<em>waterSupply</em>_<em>numberOfCups</em></pre>

    </blockquote>
    <p>The fields are separated by an underscore ( <code>_</code> ). You can assume 
      that the fields themselves do not contain any underscores.</p>
  </li>
</ul>
<h4>Class <code>OrderItem</code></h4>
<p>Class <code>OrderItem</code> models an item in an order. </p>

<p><em>Instance variables:</em></p>
<ul>
  <li><code><em>product</em></code>. This instance variable represents the one-way 
    association between <code>OrderItem</code> and <code>Product</code>. It contains 
    a reference to a <code>Product</code> object.</li>
</ul>
<ul>

  <li><code><em>quantity</em></code>. The quantity of the product in the order<code></code>.</li>
</ul>
<p><em>Constructor and methods:</em></p>
<ul>
  <li> 
    <pre><em>public OrderItem(Product initialProduct,
                 int initialQuantity)</em></pre> 
    <p>Constructor that initializes the instance variables <code>product</code> 
    and <code>quantity</code>.</p>

  </li>
</ul>
<ul>
  <li> <code><em>public Product getProduct()</em></code>. Returns the value of 
    the instance variable <code>product</code>, a reference to a <code>Product</code> 
    object.</li>
</ul>
<ul>
  <li> <code><em>public int getQuantity()</em></code>. Returns the value of the 
    instance variable <code>quantity</code>.</li>

</ul>
<ul>
  <li> <code><em>public void setQuantity(int newQuantity)</em></code>. Sets the 
    instance variable <code>quantity</code> to the value of parameter <code>newQuantity</code>.</li>
</ul>
<ul>
  <li> <code><em>public double getValue()</em></code>. Returns the product of 
    <code>quantity</code> and <code>price</code>.</li>

</ul>
<ul>
  <li><code><em>String toString()</em></code>. Overrides the method <code>toString</code> 
    in the class <code>Object</code>. Returns the string representation of an 
    <code>OrderItem</code> object. The <code>String</code> representation has 
    the following format: 
    <blockquote> 
      <pre><em>quantity</em> <em>product-code</em> <em>product-price</em></pre>

    </blockquote>
    <p>The fields are separated by a space. You can assume that the fields themselves 
      do not contain any spaces.</p>
  </li>
</ul>
<h4>Test driver classes</h4>
<p>Complete implementations of the following test drivers are provided in the 
  student archive. Use these test drivers to verify that your code works correctly. 
</p>
<ul>
  <li>Class <code>TestProduct</code></li>

  <li>Class <code>TestCoffee</code> </li>
  <li>Class <code>TestCoffeeBrewer</code> </li>
  <li>Class <code>TestOrderItem</code></li>
</ul>
<h3>Files</h3>

The following files are  needed to complete this assignment:
<ul>
  <li><cite><a href="/content/SSD/SSD3/4.2.0.1/normal/pg-class-imp/pg-impl-class/assm-exer-impl-class/pool-pr-impl-class/qn-pr-impl-class-cof-gou-sys/handout/student-files.zip"><code>student-files.zip</code></a></cite> 
    — Download this file. This archive contains the following: 
    <ul>
      <li><cite><code>TestProduct.java</code></cite> </li>
      <li><cite><code>TestCoffee.java</code></cite> </li>
      <li><cite><code>TestCoffeeBrewer.java</code></cite> </li>

      <li><cite><code>TestOrderItem.java</code></cite> </li>
    </ul>
  </li>
</ul>
<h3>Tasks </h3>
<p>Implement classes <code>Product</code>, <code>Coffee</code>, <code>CoffeeBrewer</code>, 
  and <code>OrderItem</code>. Document using Javadoc and follow Sun's code conventions. 
  The following steps will guide you through this assignment. Work incrementally 
  and test each increment. Save often. </p>

<ol start="1">
  <li><strong>Extract </strong> the files by issuing the following command at
     the command prompt:
    <p><tt>C:\&gt;</tt><kbd>unzip student-files.zip</kbd> </p>
  </li>
  <li><strong>Then</strong>, implement class <code>Product</code> from scratch.<strong> 
    </strong>Use <code>TestProduct</code> driver to test your implementation.</li>

</ol>

<ol start="3">
  <li><strong>Next</strong>, implement class <code>Coffee</code> from scratch.<strong> 
    </strong>Use <code>TestCoffee</code> driver to test your implementation.</li>
</ol>

<ol start="4">
  <li><strong>Then</strong>, implement class <code>CoffeeBrewer</code> 
    from scratch. Use <code>TestCoffeeBrewer</code> driver to test your
     implementation.</li>
</ol>

<ol start="5">
  <li><strong>Finally</strong>, implement class <code>OrderItem</code> from scratch.
     Use <code>TestOrderItem</code> driver to test your implementation.</li>

</ol>

<h3>Submission</h3>
<p>Upon completion, submit <strong>only</strong> the following:</p>
<ol>
  <li><code>Product.java</code> </li>
  <li><code>Coffee.java</code></li>

  <li><code>CoffeeBrewer.java</code> </li>
  <li><code>OrderItem.java</code> </li>
</ol> </td>
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