diff --git a/source/ap-java-cheatsheet.ptx b/source/ap-java-cheatsheet.ptx
index f272981..7e8f94a 100644
--- a/source/ap-java-cheatsheet.ptx
+++ b/source/ap-java-cheatsheet.ptx
@@ -10,7 +10,7 @@
       The following is intended to be useful in better understanding Java functions coming from a Python background.
       </p>
       </paragraphs>
-<paragraphs>
+
 <table>
     <title>Function/Method Equivalents: Python to Java</title>
     <tabular>
@@ -201,5 +201,4 @@
     </ul>
 </p>
 
-</paragraphs>
 </section>
\ No newline at end of file
diff --git a/source/ch6_definingclasses.ptx b/source/ch6_definingclasses.ptx
index 4adb2ff..5042038 100644
--- a/source/ch6_definingclasses.ptx
+++ b/source/ch6_definingclasses.ptx
@@ -628,6 +628,24 @@ public class Fraction {
                 </code> <tests> </tests>
             </program>
             </listing>
+                        <p>
+ If you ran <xref ref="java-full-fraction-class" text="type-global"/>, you probably noticed that the output is not very satisfying. Chances are your output looked something like <xref ref="java-no-friendly-output" text="type-global"/>.
+            </p>
+
+            <listing xml:id="java-no-friendly-output">
+            <program language="java">
+                <code>
+Fraction@6ff3c5b5
+                </code>
+            </program>
+            </listing>
+
+            <p>
+                The reason is that we have not yet provided a friendly string representation for our <c>Fraction</c> objects.
+                Just like in Python, whenever an object is printed by the <c>println</c> method it must be converted to string format.
+                In Python you can control how that looks by writing an <c>__str__</c> method for your class.
+                If you do not then you will get the default, which looks something like <xref ref="java-no-friendly-output" text="type-global"/>. We will see how to provide a friendly string representation for our <c>Fraction</c> class in <xref ref="inheritance" text="type-global"/>.
+            </p>
 
             <exercise label="java_method_overloading_parsons">
     <statement>
@@ -672,35 +690,11 @@ public class Fraction {
 </exercise>
 
         </subsection>
-
-
     </section>
 
     <section xml:id="inheritance">
         <title>Inheritance</title>
 
-        <introduction>
-            <p>
- If you ran the program above you probably noticed that the output is not very satisfying. Chances are your output looked something like <xref ref="java-no-friendly-output" text="type-global"/>.
-            </p>
-
-            <listing xml:id="java-no-friendly-output">
-            <program language="java">
-                <code>
-Fraction@6ff3c5b5
-                </code>
-            </program>
-            </listing>
-
-            <p>
-                The reason is that we have not yet provided a friendly string representation for our <c>Fraction</c> objects.
-                Just like in Python, whenever an object is printed by the <c>println</c> method it must be converted to string format.
-                In Python you can control how that looks by writing an <c>__str__</c> method for your class.
-                If you do not then you will get the default, which looks something like the above.
-            </p>
-        </introduction>
-
-
         <subsection>
             <title>The <c>Object</c> Class</title>
 
@@ -961,6 +955,38 @@ 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">