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Issue 388 parson in 6.3 #391

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11fd702
added exercises in 6.3
habibasorour Aug 10, 2026
2b73d6b
fixed placement
habibasorour Aug 10, 2026
5f5742a
added a smaller question
habibasorour Aug 10, 2026
732fbdf
fixed math formatting
habibasorour Aug 10, 2026
8b4d5d9
Merge branch 'master' into issue_388_parson
habibasorour Aug 10, 2026
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68 changes: 68 additions & 0 deletions source/ch6_definingclasses.ptx
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Expand Up @@ -423,6 +423,74 @@ public Fraction(Integer num, Integer den) {
</code>
</program>
</listing>

<exercise label="java_encapsulation_getters_setters_parsons">
<statement>
<p>
Rearrange the blocks to construct a fully encapsulated <c>BankAccount</c> class. The class should feature:
<ul>
<li>A <c>private double balance</c> instance variable.</li>
<li>A public getter method <c>getBalance()</c> that returns the balance.</li>
<li>A public setter method <c>setBalance(double balance)</c> that updates the balance only if the value is non-negative <m>($ \ge 0 $)</m>.</li>
</ul>
</p>
</statement>
<blocks>
<block order="1">
<choice correct="yes">
<cline>public class BankAccount {</cline>
<cline> private double balance;</cline>
</choice>
<choice correct="no">
<cline>public class BankAccount {</cline>
<cline> public double balance;</cline>
</choice>
</block>

<block order="2">
<choice correct="yes">
<cline> public double getBalance() {</cline>
<cline> return balance;</cline>
<cline> }</cline>
</choice>
<choice correct="no">
<cline> public void getBalance() {</cline>
<cline> return balance;</cline>
<cline> }</cline>
</choice>
</block>

<block order="3">
<choice correct="yes">
<cline> public void setBalance(double balance) {</cline>
</choice>
<choice correct="no">
<cline> public double setBalance(double balance) {</cline>
</choice>
</block>

<block order="4">
<choice correct="yes">
<cline> if (balance &gt;= 0.0) {</cline>
<cline> this.balance = balance;</cline>
<cline> }</cline>
<cline> }</cline>
</choice>
<choice correct="no">
<cline> if (balance &gt;= 0.0) {</cline>
<cline> balance = balance;</cline>
<cline> }</cline>
<cline> }</cline>
</choice>
</block>

<block order="5">
<cline>}</cline>
</block>
</blocks>
</exercise>


</section>

<section xml:id="methods">
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