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added a parsons problem to the inheritance section #398

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pearcej merged 1 commit into from
Aug 10, 2026
Merged

added a parsons problem to the inheritance section #398

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32 changes: 32 additions & 0 deletions source/ch6_definingclasses.ptx
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Expand Up @@ -961,6 +961,38 @@ public void test(Number a, Number b) {
You will <em>still get this error</em> even if all your code that calls this <c>test</c> method passes two <c>Fractions</c> as parameters (remember that <c>Fraction</c> does implement <c>add</c>).
</p>
</subsection>

<exercise xml:id="java-inheritance-parsons-exercise" label="java-inheritance-parsons">
<statement>
<p>
Construct the <c>toString</c> method for the <c>Fraction</c> class so that printing a
fraction shows it in the form numerator/denominator. Drag the blocks into the correct order on the right.
</p>
</statement>
<blocks>
<block order="1">
<choice correct="yes">
<cline>public String toString() {</cline>
</choice>
<choice correct="no">
<cline>public void toString() {</cline>
</choice>
</block>

<block order="2">
<choice correct="yes">
<cline> return numerator.toString() + "/" + denominator.toString();</cline>
</choice>
<choice correct="no">
<cline> numerator.toString() + "/" + denominator.toString();</cline>
</choice>
</block>

<block order="3">
<cline>}</cline>
</block>
</blocks>
</exercise>
</section>

<section xml:id="interfaces">
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