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  57. <h1>CS1301: Computer Science I (Section 3) [F14]</h1> <div id="page-navbar" class="clearfix">
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  69. <div role="main"><span id="maincontent"></span><h2>[Studio] Arrays and ArrayLists</h2><div id="intro" class="box generalbox boxaligncenter"><div class="no-overflow"><h1>Overview</h1>
  70. <p>In this studio you will practice working with arrays and <span style="font-family: 'courier new', courier, monospace;">ArrayLists</span>, as well as reviewing the basics of writing classes and unit tests.</p>
  71. <h1>Setup</h1>
  72. <p>Begin by opening <a href="http://courses.cs.westga.edu/pluginfile.php/58443/mod_assign/intro/ArraysAndArrayListsStudio.zip">this project</a> in Eclipse.</p>
  73. <h1>Feature #1: Null parameter check for the <span style="font-family: 'courier new', courier, monospace;">BoxArray</span> constructor</h1>
  74. <p>Open the <span style="font-family: 'courier new', courier, monospace;">BoxArray</span> class and find its constructor. Note that it takes as a parameter an array of <span style="font-family: 'courier new', courier, monospace;">Rectangle</span> objects. Write a parameter check that checks if the <span style="font-family: 'courier new', courier, monospace;">boxes</span> array is <span style="font-family: 'courier new', courier, monospace;">null </span>and throws an <span style="font-family: 'courier new', courier, monospace;">IllegalArgumentException</span> if it is.</p>
  75. <h2>Testing</h2>
  76. <p>Run the JUnit test class <span style="font-family: 'courier new', courier, monospace;">WhenSummingPerimeters</span>. It already contains a unit test to for the case where the boxes array is null. If the test passes, you are done with this feature. If the test does not pass, go back and correct your code.</p>
  77. <h1>Feature #2: Completing the <span style="font-family: 'courier new', courier, monospace;">BoxArray</span> constructor</h1>
  78. <p>Complete the <span style="font-family: 'courier new', courier, monospace;">BoxArray</span> constructor by:</p>
  79. <ul>
  80. <li>adding a parameter check that checks if <span style="font-family: 'courier new', courier, monospace;">boxes</span> is a zero-length array, throwing <span style="font-family: 'courier new', courier, monospace;">IllegalArgumentException</span> if it is</li>
  81. <li>properly initializing the <span style="font-family: 'courier new', courier, monospace;">boxes</span> instance variable</li>
  82. </ul>
  83. <h2>Testing</h2>
  84. <p>In <span style="font-family: 'courier new', courier, monospace;">WhenSummingPerimeters</span>, write and run a JUnit test that tests the case where a <span style="font-family: 'courier new', courier, monospace;">BoxArray</span> is constructed with a zero-length array.</p>
  85. <h1>Feature #3: Getting the sum of all perimeters</h1>
  86. <p>In the <span style="font-family: 'courier new', courier, monospace;">BoxArray</span> class, write a method <span style="font-family: 'courier new', courier, monospace;">getSumOfPerimeters()</span> that:</p>
  87. <ul>
  88. <li>uses a for-each loop over the elements of <span style="font-family: 'courier new', courier, monospace;">this.boxes</span> to:
  89. <ul>
  90. <li>find the perimeter of the current box</li>
  91. <li>add that perimeter to a running sum</li>
  92. </ul>
  93. </li>
  94. <li>returns the sum (as an <span style="font-family: 'courier new', courier, monospace;">int</span>)</li>
  95. </ul>
  96. <h2>Testing</h2>
  97. <p>In <span style="font-family: 'courier new', courier, monospace;">WhenSummingPerimeters</span>, write and run JUnit tests that handle the following cases:</p>
  98. <ul>
  99. <li>when the <span style="font-family: 'courier new', courier, monospace;">BoxArray</span> contains a single <span style="font-family: 'courier new', courier, monospace;">Rectangle</span></li>
  100. <li>when the <span style="font-family: 'courier new', courier, monospace;">BoxArray</span> contains six <span style="font-family: 'courier new', courier, monospace;">Rectangles</span></li>
  101. </ul>
  102. <p>For each test, you will need to do the following:</p>
  103. <ol>
  104. <li>create an array of <span style="font-family: 'courier new', courier, monospace;">Rectangles</span> of the appropriate size (either 1 or 6)</li>
  105. <li>assign a new <span style="font-family: 'courier new', courier, monospace;">Rectangle</span> object to each element of the array</li>
  106. <li>create a new <span style="font-family: 'courier new', courier, monospace;">BoxArray</span> object, passing the array to its constructor</li>
  107. <li>test the<span style="font-family: 'courier new', courier, monospace;"> getSumOfPerimeters()</span> method using an <span style="font-family: 'courier new', courier, monospace;">assertEquals()</span></li>
  108. </ol>
  109. <h1><span style="font-family: arial, helvetica, sans-serif;">Feature #4: The <span style="font-family: 'courier new', courier, monospace;">BoxList</span> class and constructor</span></h1>
  110. <p>Write a <span style="font-family: 'courier new', courier, monospace;">BoxList</span> class that:</p>
  111. <ul>
  112. <li>has an instance variable, named <span style="font-family: 'courier new', courier, monospace;">boxes</span>, that is an <span style="font-family: 'courier new', courier, monospace;">ArrayList</span> of <span style="font-family: 'courier new', courier, monospace;">Rectangle</span> objects.</li>
  113. <li>has a constructor that
  114. <ul>
  115. <li>takes a single parameter: an <span style="font-family: 'courier new', courier, monospace;">ArrayList</span> of <span style="font-family: 'courier new', courier, monospace;">Rectangle</span> objects. It should be named <span style="font-family: 'courier new', courier, monospace;">boxes</span>.</li>
  116. <li>performs a parameter check to make sure that <span style="font-family: 'courier new', courier, monospace;">boxes</span> is not <span style="font-family: 'courier new', courier, monospace;">null</span></li>
  117. <li>initializes the <span style="font-family: 'courier new', courier, monospace;">boxes</span> instance variable</li>
  118. </ul>
  119. </li>
  120. </ul>
  121. <h2>Testing</h2>
  122. <p>Write and run a <span style="font-family: 'courier new', courier, monospace;">WhenAveragingAreas</span> JUnit test class for testing your <span style="font-family: 'courier new', courier, monospace;">BoxList</span> class. It should have a test method for the case where we try to create a <span style="font-family: 'courier new', courier, monospace;">BoxList</span> using a <span style="font-family: 'courier new', courier, monospace;">null ArrayList parameter</span>.</p>
  123. <h1>Feature #5: Getting the average of all box areas</h1>
  124. <p>In <span style="font-family: 'courier new', courier, monospace;">BoxList</span>, write a <span style="font-family: 'courier new', courier, monospace;">getAverageArea()</span> method that finds the average of the areas of the <span style="font-family: 'courier new', courier, monospace;">Rectangles</span> in the <span style="font-family: 'courier new', courier, monospace;">BoxList</span>.</p>
  125. <h2>Testing</h2>
  126. <p>In <span style="font-family: 'courier new', courier, monospace;">WhenAveragingAreas</span>, write and run test methods for the following test cases:</p>
  127. <ul>
  128. <li>when the list has zero <span style="font-family: 'courier new', courier, monospace;">Rectangles</span> in it (should return an average of zero).</li>
  129. <li>when the list has one <span style="font-family: 'courier new', courier, monospace;">Rectangle</span> in it</li>
  130. <li>when the list has six <span style="font-family: 'courier new', courier, monospace;">Rectangles</span> in it</li>
  131. </ul>
  132. <h1>Turn-in</h1>
  133. <p>When you are finished, export your project and turn it in below.</p>
  134. <p></p>
  135. <p></p>
  136. <p></p></div></div><div class="submissionstatustable"><h3>Submission status</h3><div class="box boxaligncenter submissionsummarytable"><table class="generaltable">
  137. <tbody><tr class="r0">
  138. <td class="cell c0" style="">Submission status</td>
  139. <td class="cell c1 lastcol" style="">No attempt</td>
  140. </tr>
  141. <tr class="r1">
  142. <td class="cell c0" style="">Grading status</td>
  143. <td class="submissionnotgraded cell c1 lastcol" style="">Not graded</td>
  144. </tr>
  145. <tr class="r0">
  146. <td class="cell c0" style="">Due date</td>
  147. <td class="cell c1 lastcol" style="">Monday, November 10, 2014, 11:00 PM</td>
  148. </tr>
  149. <tr class="r1 lastrow">
  150. <td class="cell c0" style="">Time remaining</td>
  151. <td class="cell c1 lastcol" style="">5 days 9 hours</td>
  152. </tr>
  153. </tbody>
  154. </table>
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