pq7.html

卡耐基课程练习

  <p>Note: <code>Student[<em>ID</em>,<em>name</em>,<em>grade</em>]</code> is 
    a  representation of a <code>Student</code> object. </p>
</blockquote>
<ol start="4">

  <li> <strong>Implement</strong> the method <code>makeArrayListFromArray</code>:</li>
</ol>
<ul>
  <li><code><em>public static ArrayList&lt;Student&gt;  makeArrayListFromArray(Student[] array)</em></code>. 
    This method takes an array of <code>Student</code> objects and returns an array list <code></code> with the same elements in the same order.</li>

</ul>
<blockquote> 
  <p>For example, consider the following array with three <code>Student</code> objects:</p>
  <pre>  {Student[328,Galileo Galilei,80],
   Student[123,Albert Einstein,100],
   Student[96,Isaac Newton,90]}</pre>
  <p>If <code>makeArrayListFromArray</code> is passed this array, it 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>
</blockquote>
<ol start="5">
  <li><strong>Implement</strong> the method <code>hasStudent</code>. Use a <code>for-each</code> loop 
    to implement this method.</li>
</ol>

<ul>
  <li><code><em>public static boolean hasStudent(ArrayList&lt;Student&gt; arrayList, int id)</em></code>. 
    This method takes an array list of <code>Student</code> objects and a student ID, 
    returns <code>true</code> if the specified array list contains a student whose 
    ID matches the specified ID. </li>
</ul>
<blockquote> 
  <p>For example, consider the following array list:</p>

  <pre> ArrayList{Student[328,Galileo Galilei,80],
	       Student[123,Albert Einstein,100],
	       Student[96,Isaac Newton,90]}</pre>
  <p>If <code>hasStudent</code> is passed this array list and the id <code>123</code>, 
    it will return <code>true</code>. 
  </p><p>If <code>hasStudent</code> is passed this array list and the id <code>321</code>, 
    it will return <code>false</code>. </p></blockquote>

<ol start="6">
  <li><strong>Implement</strong> the method <code>countGradeGreaterOrEqual</code>. 
    Use a <code>for-each</code> loop 
    to implement this method.</li>
</ol>
<ul>
  <li><code><em>public static int countGradeGreaterOrEqual(ArrayList&lt;Student&gt; arrayList, int 
    grade)</em></code>. This method takes an array list  of <code>Student</code> objects 
    and a grade, and returns the number of students in the specified array list whose 
    grade is greater than or equal to the specified grade.</li>

</ul>
<blockquote> 
  <p>For example, consider the following array list:</p>
  <pre> ArrayList{Student[328,Galileo Galilei,80],
	       Student[123,Albert Einstein,100],
	       Student[96,Isaac Newton,90]}</pre>
  <p>If <code>countGradeGreaterOEqual</code> is passed this array list and the grade 
    <code>100</code>, it will return <code>1</code>. 
  </p><p>If <code>countGradeGreaterOEqual</code> is passed this array list and the grade 
    <code>70</code>, it will return <code>3</code>. </p></blockquote>

<ol start="7">
  <li><strong>Implement</strong> the method <code>getMinGrade</code>. Use an iterator 
    to implement this method.</li>
</ol>
<ul>
  <li><code><em>public static int getMinGrade(ArrayList&lt;Student&gt; arrayList)</em></code>. This 
    method takes an array list of <code>Student</code> objects and returns the smallest 
    grade of the students in the specified array list. To simplify the code, you may 
    assume that the array list is not empty.</li>

</ul>
<blockquote> 
  <p>For example, consider the following array list:</p>
  <pre> ArrayList{Student[328,Galileo Galilei,80],
	       Student[123,Albert Einstein,100],
	       Student[96,Isaac Newton,90]}</pre>
  <p>If <code>getMinGrade</code> is passed this  array list, it will return <code>80</code><code></code>. 
  </p>
</blockquote>

<ol start="8">
  <li><strong>Implement</strong> the method <code>getGradeAverage</code>. Use a <code>for-each</code> loop 
    to implement this method.</li>
</ol>
<ul>
  <li><code><em>public static double getGradeAverage(ArrayList&lt;Student&gt; arrayList)</em></code>. 
    This method takes an array list of <code>Student</code> objects and returns the 
    average grade of the students in the specified array list.<code></code></li>

</ul>
<blockquote> 
  <p>For example, consider the following array list:</p>
  <pre> ArrayList{Student[328,Galileo Galilei,80],
	       Student[123,Albert Einstein,100],
	       Student[96,Isaac Newton,90]}</pre>
  <p>If <code>getGradeAverage</code> is passed this array list, it<code></code> will 
    return <code>90.0</code><code></code>. </p>

</blockquote>
<ol start="9">
  <li><strong>Implement</strong> the method <code>removeGradeLess</code>. Use 
    an iterator to implement this method.</li>
</ol>
<ul>
  <li><code><em>public static void removeGradeLess(ArrayList&lt;Student&gt; arrayList, int grade)</em></code>. 
    This method takes an array list of <code>Student</code> objects and a grade, and 
    removes all students in the specified array list whose grade is less than the 
    specified grade.</li>

</ul>
<blockquote> 
  <p>For example, consider the following array list: </p>
  <pre> ArrayList{Student[328,Galileo Galilei,80],
	       Student[123,Albert Einstein,100],
	       Student[96,Isaac Newton,90]}</pre>
  <p>If <code>removeGradeLess</code> is passed this array list and the grade <code>100</code>, 
    the array list will be modified as follows:</p>
  <pre> ArrayList{Student[123,Albert Einstein,100]}</pre>

</blockquote>
<ol start="10">
  <li><strong>Implement</strong> the method <code>displayAll</code>. Use an iterator 
    to implement this method.</li>
</ol>
<ul>
  <li><code><em>public static String displayAll(ArrayList&lt;Student&gt; arrayList)</em></code>. This 
    method takes an array list of <code>Student</code> objects and returns a string 
    representation of the specified array list. To simplify the code, you may assume 
    that every element in the specified array list contains a valid reference to a 
    <code>Student</code> object.</li>

</ul>
<blockquote>
  <p>Use the method <code>toString</code> in the class <code>Student</code> to 
    obtain the string representation of each object in the array list. A new line 
    character ( \n ) should separate the string representations of the objects.</p>
  <p>For example, consider the following array list:</p>
  <pre> ArrayList{Student[328,Galileo Galilei,80],
	       Student[123,Albert Einstein,100]}</pre>

  <p>If this array list is passed to <code>displayAll</code>, the following string 
    will be returned:</p>
  <pre>  	"Student[328,Galileo Galilei,80]\nStudent[123,Albert Einstein,100]"</pre>
  <p>Note that the string does <em>not</em> end with a new line character ( \n 
    ).</p>
</blockquote>
<h3>Submission</h3>

  
<p>Upon completion, submit <strong>only</strong> the following:</p>
  
<ol>
    
  <li><code>StudentArrayList.java</code></li>
</ol>

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