diff --git a/source/ch6_definingclasses.ptx b/source/ch6_definingclasses.ptx
index 4375608..4a270ce 100644
--- a/source/ch6_definingclasses.ptx
+++ b/source/ch6_definingclasses.ptx
@@ -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">