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added a select all that apply multiple choice question #417

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51 changes: 51 additions & 0 deletions source/ch9_commonmistakes.ptx
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Expand Up @@ -228,6 +228,57 @@

</p>

<exercise label="java-new-keyword-checkpoint">
<statement>
<p>
Based on <xref ref="new-keyword-error" text="type-global"/>, select all of the
statements that are true about creating objects in Java.
</p>
</statement>
<choices>
<choice correct="yes">
<statement>
<p>Java requires the <c>new</c> keyword to create a new object.</p>
</statement>
<feedback>
<p>Correct! Unlike Python, Java needs the <c>new</c> keyword to instantiate an object.</p>
</feedback>
</choice>
<choice correct="yes">
<statement>
<p>Writing <c>data = new Scanner(new File("test.dat"));</c> would fix the error.</p>
</statement>
<feedback>
<p>Correct! Adding <c>new</c> before <c>Scanner</c> properly creates the object and resolves the error.</p>
</feedback>
</choice>
<choice correct="yes">
<statement>
<p><c>Scanner</c> is a constructor of the <c>Scanner</c> class, not a standalone method.</p>
</statement>
<feedback>
<p>Correct! Because <c>Scanner</c> is a constructor, it must be called with <c>new</c>.</p>
</feedback>
</choice>
<choice>
<statement>
<p>Java can create objects without a keyword, just like Python.</p>
</statement>
<feedback>
<p>Incorrect. Unlike Python, Java requires the <c>new</c> keyword to instantiate objects.</p>
</feedback>
</choice>
<choice>
<statement>
<p>The "cannot find symbol" error here means the <c>Scanner</c> class was not imported.</p>
</statement>
<feedback>
<p>Incorrect. The <c>Scanner</c> class is imported; the error is caused by the missing <c>new</c> keyword.</p>
</feedback>
</choice>
</choices>
</exercise>

</section>

<section xml:id="forgetting-to-declare-the-kind-of-object-in-a-container">
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