pq1.html

卡耐基课程练习

<span class="dialogueheader">Take Assessment: Practical Quiz 1</span><br><br>
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<h2 align="center"><cite>iCarnegie</cite> Information</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>Java Language</em> 
      <ul>

        <li>Use of Java control structures</li>
      </ul>
    </li><li><i>Java API</i> 
      <ul>
        <li>Knowledge of package <code>java.io</code> 
          <ul>
            <li>How to get input from the keyboard</li>

            <li>How to output results, prompts, and errors</li>
          </ul>
        </li>
        <li>Knowledge of wrapper class <code>Integer</code>: how to read an integer 
          value as input</li>
      </ul>
    </li><li> <i>Exception Objects</i> 
      <ul>

        <li>Knowledge of exception handling</li>
        <li>Knowledge of <code>NumberFormatException</code></li>
      </ul>
    </li><li><i>Programming Practice</i> 
      <ul>
        <li>How to produce Java applications</li>
        <li>Knowledge of Sun's code conventions</li>

      </ul>
      <ul>
        <li>Knowledge of Javadoc: how to document classes, methods, and variables</li>
      </ul>
  </li></ul>
  <p> <b><i>Goals:</i></b> Reinforce your ability to build console applications 
    using I/O classes, wrapper classes, and exceptions
  </p><p> <b><i>Outcomes:</i></b> You will master the following skills: 
  </p><ul>

    <li> Produce a menu-driven application that reads data from the keyboard and 
      displays results in the standard output
    </li><li>Produce an application that uses: 
      <ul>
        <li>Wrapper classes to read numerical data</li>
        <li> Exceptions to handle malformed data</li>
        <li>Control structures to control the reading of data</li>
      </ul>

  </li></ul>
</blockquote> 
    
<h3>Background</h3>
  
<p>Menus for soliciting input from the user are common in console applications. 
  This assignment asks you to construct a menu-driven application that reads and 
  validates user input. Your application will consist of one class called <code>ICarnegieInfoApplication</code>.</p> 
<h3>Description</h3>

<p><code>ICarnegieInfoApplication</code> presents the user with a menu of options, 
  prompts the user for a choice, and processes the user's response:</p>

<ul>
  <li>Choice 0 terminates the program.</li>
  <li>Choice 1 displays the name of <cite>iCarnegie</cite>.</li>
  <li>Choice 2 displays the address of <cite>iCarnegie</cite>.</li>
  <li>Choice 3 displays the telephone of <cite>iCarnegie</cite>.</li>

  <li>Choice 4 displays the email of <cite>iCarnegie</cite>.</li>
  <li>Choice 5 displays the URL of <cite>iCarnegie</cite>.</li>
</ul>
<p> The class <code>ICarnegieInfoApplication</code> uses the class <code>ICarnegieInfo</code>. 
  <code>ICarnegieInfo</code> stores the contact information for <cite>iCarnegie</cite>. 
  A complete implementation of <code>ICarnegieInfo</code> is provided in the student 
  archive <cite><a href="/content/SSD/SSD3/4.2.0.1/normal/pg-class-dsgn/pg-java-apps/assm-qz-pr-io-tokenzr/pool-pr-io-excptns/qn-pr-icarnegie-info/handout/student-files.zip">student-files.zip</a></cite>. Review 
  its documentation and become familiar with it. </p>

<ul>
  <li><code><a href="/content/SSD/SSD3/4.2.0.1/normal/pg-class-dsgn/pg-java-apps/assm-qz-pr-io-tokenzr/pool-pr-io-excptns/qn-pr-icarnegie-info/handout/ICarnegieInfo.html" target="internalWindow"><em>ICarnegieInfo</em></a></code>. 
    Documentation for class <code>ICarnegieInfo</code></li>
</ul>
<p>Note that class <code>ICarnegieInfo</code> does not have a public constructor. 
  Instead, you will use the method <code>ICarnegieInfo.getInstance</code> to obtain 
  an instance of the class.</p>
<p>A partial implementation of class <code>ICarnegieInfoApplication</code> is 
  provided. This class contains the following methods:</p>

<ul>
  <li> <code><em>public static void main(String[] args)</em></code>. This method 
    is complete and requires no modification. <code>main</code> has a loop that 
    calls the method <code>getChoice</code> to obtain the user's choice. <code>main</code> 
    then displays the information requested. Choice <code>0</code> causes the 
    loop to terminate gracefully. </li>

</ul>
<ul>
  <li><code><em>private static int getChoice()</em></code>. This method must be 
    completed. <code>getChoice</code> presents the user with a menu of options 
    and verifies the user's choice.</li>
</ul>

<h3>Files</h3>
<p>The following files are needed to complete this assignment: </p>
<ul>
  <li><cite><a href="/content/SSD/SSD3/4.2.0.1/normal/pg-class-dsgn/pg-java-apps/assm-qz-pr-io-tokenzr/pool-pr-io-excptns/qn-pr-icarnegie-info/handout/exe-icarnegie-info.jar">exe-icarnegie-info.jar</a></cite>. 
    Download this file. It is a sample executable.</li>

  <li><cite><a href="/content/SSD/SSD3/4.2.0.1/normal/pg-class-dsgn/pg-java-apps/assm-qz-pr-io-tokenzr/pool-pr-io-excptns/qn-pr-icarnegie-info/handout/student-files.zip">student-files.zip</a></cite>. Download 
    this file. This archive contains the following: 
    <ul>
      <li><cite>ICarnegieInfo.class</cite>. A complete implementation</li>
      <li><cite>ICarnegieInfo.html</cite>. Documentation</li>
      <li><cite>ICarnegieInfoApplication.java</cite>. Use this template to complete 
        your implementation.</li>
    </ul>

  </li>
</ul>
<h3>Tasks</h3>
<p>To complete this assessment, you will implement method <code>getChoice</code>. 
  The following steps will guide you through this assignment. Document using Javadoc 
  and follow Sun's code conventions. Work incrementally and test each increment. 
  Save often. </p>
<ol>
  <li><strong>Extract</strong> the student archive by issuing the following command 
    at the command prompt: 
    <blockquote><tt>C:\&gt;</tt><kbd>unzip student-files.zip</kbd></blockquote>

  </li>
</ol>
<ol start="2">
  <li><strong>Run</strong> the sample executable by issuing the following command 
    at the command prompt: 
    <blockquote><tt>C:\&gt;</tt><kbd>java -jar exe-icarnegie-info.jar</kbd></blockquote>
    Observe how the program responds to the following types of input:<br>
    <ul>
      <li>A choice that is not an integer: <kbd>aa</kbd></li>

      <li>An integer that is below the valid range: <kbd>-1</kbd></li>
      <li> An integer that is above the valid range: <kbd>6</kbd></li>
      <li>An integer that is within the valid range: <kbd>1</kbd>, <kbd>2</kbd>, 
        <kbd>3</kbd>, <kbd>4</kbd>, <kbd>5</kbd> and <kbd>0</kbd></li>

    </ul>
  </li>
</ol>
<ol start="3">
  <li><strong>Next</strong>, complete the implementation of method <code>getChoice</code>: 
    <p><code><em>protected static int getChoice()</em></code>. This method displays 
      the following menu of options and prompts the user for a choice. </p>
    <blockquote> 
      <pre>0 – Quit
1 – Display name
2 – Display address
3 – Display telephone
4 – Display email
5 – Display URL
choice&gt;</pre>

    </blockquote>
    <p><code>getChoice</code> then reads and validates the user's input:</p>
    <ul>
      <li>If the user enters a choice that is not an integer, <a href="http://java.sun.com/j2se/1.5/docs/api/java/lang/NumberFormatException.html" target="externalWindow"><code>java.lang.NumberFormatException</code></a> 
        is caught and output.</li>
      <li> If the user enters an integer outside of the valid range [0,5], an 
        error message is displayed. </li>

    </ul>
    <p>If the input is invalid, <code>getChoice</code> re-prompts the user for 
      a new choice. If the input is valid, <code>getChoice</code> returns the 
      user's choice. </p>
  </li>
</ol>
<h3>Submission</h3>
<p>Upon completion, submit <strong>only</strong> the following:</p>