From 1eb27de8c3fde657aea5376c57d5b84bccab6947 Mon Sep 17 00:00:00 2001
From: Habiba Sorour <habiba.sorour2005@gmail.com>
Date: Fri, 31 Jul 2026 18:47:46 +0300
Subject: [PATCH 1/2] added listing tags

---
 source/ch6_definingclasses.ptx | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/source/ch6_definingclasses.ptx b/source/ch6_definingclasses.ptx
index 252ec9b..e5012be 100644
--- a/source/ch6_definingclasses.ptx
+++ b/source/ch6_definingclasses.ptx
@@ -203,8 +203,8 @@ public void setDenominator(Integer denominator) {
             Our constructor will take two parameters: the numerator and the denominator.
         </p>
 
-
-        <program xml:id="java-fraction-constructor" language="java">
+        <listing xml:id="java-fraction-constructor">
+        <program interactive="activecode" language="java">
             <code>
 public Fraction(Integer top, Integer bottom) {
     num = top;
@@ -212,6 +212,7 @@ public Fraction(Integer top, Integer bottom) {
 }
             </code>
         </program>
+        </listing>
 
         <p>
             <idx><c>this</c></idx>
@@ -224,8 +225,8 @@ public Fraction(Integer top, Integer bottom) {
             For example this alternate definition of the the Fraction constructor uses <c>this</c> to differentiate between parameters and instance variables.
         </p>
 
-
-        <program xml:id="java-fraction-class-this" language="java">
+        <listing xml:id="java-fraction-class-this">
+        <program interactive="activecode" language="java">
             <code>
 public Fraction(Integer num, Integer den) {
     this.num = num;
@@ -233,6 +234,7 @@ public Fraction(Integer num, Integer den) {
 }
             </code>
         </program>
+        </listing>
     </section>
 
     <section xml:id="methods">

From 7c86b21541b43c63e5da2825329df06d14b88241 Mon Sep 17 00:00:00 2001
From: Habiba Sorour <habiba.sorour2005@gmail.com>
Date: Fri, 31 Jul 2026 18:52:05 +0300
Subject: [PATCH 2/2] added listing to txt

---
 source/ch6_definingclasses.ptx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/source/ch6_definingclasses.ptx b/source/ch6_definingclasses.ptx
index e5012be..185851a 100644
--- a/source/ch6_definingclasses.ptx
+++ b/source/ch6_definingclasses.ptx
@@ -200,7 +200,7 @@ public void setDenominator(Integer denominator) {
             In Java, <term>constructors</term> have the same name as the class and are declared public.
             They are declared without a return type.
             So any method that is named the same as the class and has no return type is a constructor.
-            Our constructor will take two parameters: the numerator and the denominator.
+            Our constructor will take two parameters: the numerator and the denominator. <xref ref="java-fraction-constructor" text="type-global"/> shows the constructor for the <c>Fraction</c> class.
         </p>
 
         <listing xml:id="java-fraction-constructor">
@@ -222,7 +222,7 @@ public Fraction(Integer top, Integer bottom) {
             This allows the Java compiler to do the work of dereferencing the current Java object.
             Java does provide a special variable called <c>this</c> that works like the <c>self</c> variable.
             In Java, <c>this</c> is typically only used when it is needed to differentiate between a parameter or local variable and an instance variable.
-            For example this alternate definition of the the Fraction constructor uses <c>this</c> to differentiate between parameters and instance variables.
+            For example,<xref ref="java-fraction-constructor" text="type-global"/> shows an alternate definition of the the Fraction constructor that uses <c>this</c> to differentiate between parameters and instance variables.
         </p>
 
         <listing xml:id="java-fraction-class-this">