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Issue 393, added parson problem to 6.6 #400

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Issue 393, added parson problem to 6.6 #400

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43 changes: 43 additions & 0 deletions source/ch6_definingclasses.ptx
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Expand Up @@ -1073,6 +1073,49 @@ public int compareTo(Fraction other) { // compare this fraction with another fra
</program>
</listing>

<exercise label="java_comparable_interface_parsons">
<statement>
<p>
Rearrange the blocks to create a <c>Student</c> class that implements <c>Comparable&lt;Student&gt;</c>. The class should feature a <c>private double gpa</c> field and a <c>compareTo</c> method that compares students based on their GPA.
</p>
</statement>
<blocks>
<block order="1">
<choice correct="yes">
<cline>public class Student implements Comparable&lt;Student&gt; {</cline>
<cline> private double gpa;</cline>
</choice>
<choice correct="no">
<cline>public class Student extends Comparable&lt;Student&gt; {</cline>
<cline> public double gpa;</cline>
</choice>
</block>

<block order="2">
<cline> public Student(double gpa) {</cline>
<cline> this.gpa = gpa;</cline>
<cline> }</cline>
</block>

<block order="3">
<choice correct="yes">
<cline> public int compareTo(Student other) {</cline>
<cline> return Double.compare(this.gpa, other.gpa);</cline>
<cline> }</cline>
</choice>
<choice correct="no">
<cline> public boolean compareTo(Student other) {</cline>
<cline> return this.gpa - other.gpa;</cline>
<cline> }</cline>
</choice>
</block>

<block order="4">
<cline>}</cline>
</block>
</blocks>
</exercise>

</section>


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