pq7.html

卡耐基课程练习

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  <h2>Using Java Collections</h2>

</center>

<h3>Prerequisites, Goals, and Outcomes</h3>
<blockquote> <b><i>Prerequisites:</i></b> Before you begin this exercise, you 
  need: 
  <ul>
    <li><em> Java collections</em>      
      <ul>
        <li>Knowledge of class <code>ArrayList</code>

          <ul>
            <li>Declaring array lists</li>
            <li>Initializing array lists</li>
            <li>Accessing  array list elements </li>
            <li>Adding elements to an array list</li>
            <li>Removing elements from an array list</li>

          </ul>
        </li>
      </ul>
  </li></ul>
  <ul>
    <li> <em>Iterators and <code>for-each</code> loop</em>: 
      <ul>

        <li>Know how to traverse and manipulate a collection using  iterators and <code>for-each</code> loops.</li>
      </ul>
  </li></ul> 
  <p> <b><i>Goals:</i></b> Reinforce your ability to use class <code>ArrayList</code>, iterators
and <code>for-each</code> loops.

</p><p> <b><i>Outcomes:</i></b> You will demonstrate mastery of the following: 
  </p><ul>
    <li>Using Java collections
<ul>
        <li>Creating a collection: 
          <ul>
            <li>From a set of  objects </li>
            <li>From an array</li>

          </ul>
        </li>
      </ul>
    </li>
  </ul>
</blockquote>
<blockquote> 
  <ul>
    <ul>
      <li>Processing collections</li>

    </ul>
    <ul>
      <ul>
        <li>Finding an element with a specific characteristic </li>
        <li>Counting the number of  elements with a specific characteristic</li>
        <li>Analyzing the contents of a collection
          <p></p>
        </li>

      </ul>
      <li>Removing elements from a collection:
        <ul>
          <li>Removing all objects with a specific characteristic </li>
        </ul>
      </li>
    </ul>
  </ul>
</blockquote>

<blockquote> 
  <ul>
    <ul>
      <li>Displaying the contents of a collection
<ul>
          <li>Obtaining the  string representation of a collection</li>
        </ul>
      </li>
    </ul>

  </ul>
</blockquote>
<h3>Background </h3>
<p> This assignment asks you to implement a set of methods  to
  process Java collections.<b></b></p>
<b>
<h3>Description</h3>
</b> 
<p>In this assignment, you will finish the implementation of <code>StudentArrayList</code>, a class with methods for processing an <a href="http://java.sun.com/j2se/1.5/docs/api/java/util/ArrayList.html" target="externalWindow"><code><em>ArrayList</em></code></a> of <code>Student</code> objects. iCarnegie provides
  a test driver and the class <code>Student</code>.</p>

<h4>Class <code>Student</code></h4>
<p>A complete implementation of this class  is included in the student archive <cite><a href="/content/SSD/SSD3/4.2.0.1/normal/pg-class-imp/pg-collctns/assm-qz-pr-java-collctns/pool-pr-java-collctns/qn-pr-java-collctns/handout/student-files.zip"><code>student-files.zip</code></a></cite>. 
Stop <em>now</em> and review its documentation:</p>
<ul>
  <li><a href="/content/SSD/SSD3/4.2.0.1/normal/pg-class-imp/pg-collctns/assm-qz-pr-java-collctns/pool-pr-java-collctns/qn-pr-java-collctns/handout/Student.html" target="externalWindow"><code><em>Student.html</em></code></a>. 
    Documentation of class <code>Student</code></li>
</ul>

<h4>Class <code>StudentArrayList</code></h4>
<p>A partial implementation of this class is included in 
  the student archive <cite><a href="/content/SSD/SSD3/4.2.0.1/normal/pg-class-imp/pg-collctns/assm-qz-pr-java-collctns/pool-pr-java-collctns/qn-pr-java-collctns/handout/student-files.zip"><code>student-files.zip</code></a></cite>. 
  You should complete the implementation of each method. </p>
<h4>Class <code>TestStudentArrayList</code></h4>
<p>This class is a test driver for  class <code>StudentArrayList</code>. 
  It contains test cases for each method in the class. A complete implementation
  is included in the student archive 
  <cite><a href="/content/SSD/SSD3/4.2.0.1/normal/pg-class-imp/pg-collctns/assm-qz-pr-java-collctns/pool-pr-java-collctns/qn-pr-java-collctns/handout/student-files.zip"><code>student-files.zip</code></a></cite>. 
  You should use this class to test your implementation of class <code>StudentArrayList</code>.</p>

<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-collctns/assm-qz-pr-java-collctns/pool-pr-java-collctns/qn-pr-java-collctns/handout/student-files.zip"><code>student-files.zip</code></a></cite>. 
    Download this file. This archive contains the following: 
    <ul>
      <li><cite><code>Student.java</code></cite>. A complete implementation</li>
      <li> <cite><code>StudentArrayList.java</code></cite>. Use this template to 
        complete your implementation.</li>

      <li><cite><code>Test</code></cite><cite><code>StudentArrayList.java</code></cite>. 
        A complete implementation</li>
    </ul>
  </li>
</ul>
<h3>Tasks </h3>
<p> Implement all methods in class <code>StudentArrayList</code>. 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>Test</strong> each method as soon as you finish writing it by issuing 
    the following command at the command prompt: 
    <p><tt>C:\&gt;</tt><kbd>java TestStudentArrayList</kbd></p>

  </li>
</ol>
<ol start="3">
  <li><strong> Implement</strong> the method <code>makeArrayList</code>:</li>
</ol>
<ul>
  <li><code><em>public static ArrayList&lt;Student&gt;  makeArrayList(Student first, Student second, 
    Student third)</em></code>. This method takes three <code>Student</code> objects 
    and returns an array list with three elements. The first element of the array list 
    contains a reference to the first argument; the second element contains a 
    reference to the second argument; and the third element contains a reference 
    to the third argument.</li>

</ul>
<blockquote> 
  <p>For example, consider the following three <code>Student</code> objects:</p>
  <ul>
    <li><code>Student[328,Galileo Galilei,80]</code></li>
    <li><code>Student[123,Albert Einstein,100]</code></li>
    <li><code>Student[96,Isaac Newton,90]</code></li>

  </ul>
  <p>If these objects are passed to <code>makeArrayList</code> in the indicated order, 
    <code>makeArrayList</code> will return an array list with three <code>Student</code> objects:</p>
  <pre> ArrayList{Student[328,Galileo Galilei,80],
	       Student[123,Albert Einstein,100],
	       Student[96,Isaac Newton,90]}</pre>