From eb7906fdc92d1fe81b2f1ed5d79886a71a97a49f Mon Sep 17 00:00:00 2001
From: Martin Goik <goik@hdm-stuttgart.de>
Date: Tue, 1 Apr 2014 07:17:27 +0200
Subject: [PATCH] adding lastAnswerId mechanism
---
Sd1/Makefile | 7 +-
Sd1/swd1.xml | 644 +++++++++++++++++++++++----------------------------
2 files changed, 297 insertions(+), 354 deletions(-)
diff --git a/Sd1/Makefile b/Sd1/Makefile
index bdfbc8fcd..9f35b41b4 100644
--- a/Sd1/Makefile
+++ b/Sd1/Makefile
@@ -30,13 +30,14 @@ jdoc:
`find Jdbc -name \*.java|grep -v \.metadata` `find Hibintro -name \*.java|grep -v \.metadata`
-${BUILDNAVI}/index.html ${BUILDNAVI}/printversion.pdf:${SCRIPTBASENAME}.xml
+${BUILDNAVI}/index.html ${BUILDNAVI}/printversion.pdf:${SCRIPTBASENAME}.xml lastAnswerId.xml
rm -rf $(BUILDBASE) || true
mkdir -p ${BUILDNAVI} ${BUILDNONAVI}
#cd Ref/Fig;make all
- /usr/share/xmlmind/bin/convertdoc -p eclipse.plugin.id $(PLUGINID) ${PPARAM} db5.toEclipseHelp ${SCRIPTBASENAME}.xml -u $(BUILDNAVI)
+ saxon9he-xslt -xi -s:${SCRIPTBASENAME}.xml -xsl:../ws/Docbook/Extensions/Xsl/docbook2docbook.xsl > ${SCRIPTBASENAME}.answer.xml
+ /usr/share/xmlmind/bin/convertdoc -p eclipse.plugin.id $(PLUGINID) ${PPARAM} db5.toEclipseHelp ${SCRIPTBASENAME}.answer.xml -u $(BUILDNAVI)
perl -i -p -e '$$/=undef;s/\n[ \t]*<!DOCTYPE[^>]+\n[^>]*>$$//m' ${BUILDNAVI}/*.xml ${BUILDNONAVI}/*.xml
- /usr/share/xmlmind/bin/convertdoc db5.toPSFile ${SCRIPTBASENAME}.xml \
+ /usr/share/xmlmind/bin/convertdoc db5.toPSFile ${SCRIPTBASENAME}.answer.xml \
-s pdf -s "|pdf" -u $(BUILDNAVI)/printversion.pdf
# j2h -d ${BUILDNAVI}/src/classes -js ~/workspace/StructuredData/ws/eclipse/Jdbc/src \
-jd /usr/share/doc/openjdk-7-doc/api http://java.sun.com/javase/7/docs/api
diff --git a/Sd1/swd1.xml b/Sd1/swd1.xml
index 3913bad8c..3aad882f9 100644
--- a/Sd1/swd1.xml
+++ b/Sd1/swd1.xml
@@ -161,7 +161,7 @@
</chapter>
<chapter xml:id="sd1IntroGreenfoot">
- <title>Lecture 2, Introduction to <link
+ <title>Lecture 2 - Introduction to <link
xlink:href="http://www.greenfoot.org">Greenfoot</link></title>
<section xml:id="swd1IntrGreePrepare">
@@ -296,132 +296,140 @@
by sitting at your computer with <productname>Greenfoot</productname>
open on your screen and the book open on your desk.</para>
</blockquote>
+ </section>
+ </chapter>
- <section xml:id="sw1ObjClass">
- <title>GF 1.1: Classes an objects</title>
+ <chapter xml:id="sd1CrabExample">
+ <title>Lecture 3 - Wombats and crabs</title>
- <itemizedlist>
- <listitem>
- <para>Compilation: .java --> .class</para>
- </listitem>
+ <section xml:id="sw1ObjClass">
+ <title>GF 1.1: Classes an objects</title>
- <listitem>
- <para>Classes and objects</para>
- </listitem>
+ <itemizedlist>
+ <listitem>
+ <para>Compilation: .java --> .class</para>
+ </listitem>
- <listitem>
- <para>Methods</para>
+ <listitem>
+ <para>Classes and objects</para>
+ </listitem>
- <figure xml:id="sw1FigMethodVoidVoid">
- <title>A method named <code>move</code> having no arguments
- returning nothing.</title>
+ <listitem>
+ <para>Methods</para>
- <mediaobject>
- <imageobject>
- <imagedata fileref="Ref/Fig/turnLeft.fig"/>
- </imageobject>
- </mediaobject>
- </figure>
+ <figure xml:id="sw1FigMethodVoidVoid">
+ <title>A method named <code>move</code> having no arguments
+ returning nothing.</title>
- <figure xml:id="sd1returnIntVoid">
- <title>A method named <methodname>getLeavesEaten</methodname>
- having no arguments returning an integer value</title>
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/turnLeft.fig"/>
+ </imageobject>
+ </mediaobject>
+ </figure>
- <mediaobject>
- <imageobject>
- <imagedata fileref="Ref/Fig/returnValue.fig"/>
- </imageobject>
- </mediaobject>
- </figure>
+ <figure xml:id="sd1returnIntVoid">
+ <title>A method named <methodname>getLeavesEaten</methodname>
+ having no arguments returning an integer value</title>
- <figure xml:id="sd1setDirection">
- <title>A method named <methodname>setDirection</methodname>
- setting an object's direction of movement returning no
- value.</title>
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/returnValue.fig"/>
+ </imageobject>
+ </mediaobject>
+ </figure>
- <mediaobject>
- <imageobject>
- <imagedata fileref="Ref/Fig/setDirection.fig"/>
- </imageobject>
- </mediaobject>
- </figure>
+ <figure xml:id="sd1setDirection">
+ <title>A method named <methodname>setDirection</methodname>
+ setting an object's direction of movement returning no
+ value.</title>
- <figure xml:id="sd1getAverageSpeed">
- <title>A method named <methodname>getAveragespeed</methodname>
- having two arguments distance in kilometers and time in minutes
- returning the average speed as kilometers per hour</title>
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/setDirection.fig"/>
+ </imageobject>
+ </mediaobject>
+ </figure>
- <mediaobject>
- <imageobject>
- <imagedata fileref="Ref/Fig/getAverageSpeed.fig"/>
- </imageobject>
- </mediaobject>
- </figure>
- </listitem>
+ <figure xml:id="sd1getAverageSpeed">
+ <title>A method named <methodname>getAveragespeed</methodname>
+ having two arguments distance in kilometers and time in minutes
+ returning the average speed as kilometers per hour</title>
+
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/getAverageSpeed.fig"/>
+ </imageobject>
+ </mediaobject>
+ </figure>
+ </listitem>
- <listitem>
- <para>Command like methods may change an object's internal
- state.</para>
- </listitem>
+ <listitem>
+ <para>Command like methods may change an object's internal
+ state.</para>
+ </listitem>
- <listitem>
- <para>Inspecting internal states of objects in Greenfoot.</para>
- </listitem>
+ <listitem>
+ <para>Inspecting internal states of objects in
+ <productname>Greenfoot</productname>.</para>
+ </listitem>
- <listitem>
- <para>Building models: Abstraction of real world entities</para>
+ <listitem>
+ <para>Building models: Abstraction of real world entities</para>
- <itemizedlist>
- <listitem>
- <para>Books</para>
- </listitem>
+ <itemizedlist>
+ <listitem>
+ <para>Books</para>
+ </listitem>
- <listitem>
- <para>Humans</para>
- </listitem>
- </itemizedlist>
- </listitem>
- </itemizedlist>
-
- <qandaset>
- <title>Automatic initialization on startup</title>
-
- <qandadiv>
- <qandaentry>
- <question>
- <para>On startup the <quote>leaves and wombats</quote>
- scenario does not create leaves and wombats automatically.
- Open the <classname>WombatWorld</classname> class (right click
- <quote>Open editor</quote>). You will discover a method being
- declared as <methodname>public void
- populate()</methodname>.</para>
-
- <para>The name already suggests that this method may be used
- to populate the game's world (with wombats and leaves) on
- startup. Modify the code to achieve this behaviour. Hint:
- Whenever a new instance of <classname>WombatWorld</classname>
- is being created the method <methodname>public
- WombatWorld()</methodname> is being executed.</para>
-
- <para>We will later explain the meaning of<methodname> public
- WombatWorld()</methodname> being a so called constructor. As
- the name suggests a constructor is being executed whenever a
- new instance of a given class gets created.</para>
- </question>
-
- <answer>
- <para>Calling the method <methodname>populate()</methodname>
- <coref linkend="sw1CallPopulate"/> from within the
- <classname>WombatWorld</classname> constructor's code achieves
- the desired behaviour:</para>
-
- <programlisting>public class WombatWorld {
+ <listitem>
+ <para>Humans</para>
+ </listitem>
+ </itemizedlist>
+ </listitem>
+ </itemizedlist>
+
+ <qandaset>
+ <title>Automatic initialization on startup</title>
+
+ <qandadiv>
+ <qandaentry>
+ <question>
+ <para>On startup the <quote>leaves and wombats</quote> scenario
+ does not create leaves and wombats automatically. Open the
+ <classname>WombatWorld</classname> class (right click
+ <quote>Open editor</quote>). You will discover a method being
+ declared as <methodname>public void
+ populate()</methodname>.</para>
+
+ <para>The name already suggests that this method may be used to
+ create wombats and leaves <emphasis>automatically</emphasis> on
+ startup. Modify the code accordingly to achieve this
+ behaviour.</para>
+
+ <para>Hint: Whenever a new instance of
+ <classname>WombatWorld</classname> is being created the method
+ <methodname>public WombatWorld()</methodname> is being executed.
+ We will later explain the meaning of<methodname> public
+ WombatWorld()</methodname> being a so called
+ <emphasis>constructor</emphasis>. As the name suggests a
+ constructor is being executed whenever a new instance of a given
+ class is being created. </para>
+ </question>
+
+ <answer>
+ <para>Calling the method <methodname>populate()</methodname>
+ <coref linkend="sw1CallPopulate"/> from within the
+ <classname>WombatWorld</classname> constructor's code achieves
+ the desired behaviour:</para>
+
+ <programlisting>public class WombatWorld {
public WombatWorld() { <emphasis role="bold">// Constructor will be called each time a WombatWorld</emphasis>
super(8, 8, 60); <emphasis role="bold">// is being created</emphasis>
setBackground("cell.jpg");
setPaintOrder(Wombat.class, Leaf.class);
<emphasis role="bold">populate()</emphasis>; <co
- xml:id="sw1CallPopulate"/>
+ xml:id="sw1CallPopulate"/>
}
/**
* Populate the world with a fixed scenario of wombats and leaves.
@@ -430,207 +438,140 @@
Wombat w1 = new Wombat();
addObject(w1, 3, 3);
...</programlisting>
- </answer>
- </qandaentry>
- </qandadiv>
- </qandaset>
+ </answer>
+ </qandaentry>
+ </qandadiv>
+ </qandaset>
+
+ <qandaset>
+ <title>Representation of directions</title>
- <qandaset>
- <title>Representation of directions</title>
+ <qandadiv>
+ <qandaentry>
+ <question>
+ <para>Our Wombat class does have a method
+ <methodname>setDirection(int direction)</methodname>. This
+ allows for setting the direction a wombat is going to move. Call
+ it inserting different values by right clicking on a wombat
+ instance. How do entered values relate to directions of a
+ wombat's movement? You may evaluate the result by actually
+ watching its moving direction. Is there another way?</para>
- <qandadiv>
- <qandaentry>
- <question>
- <para>Our Wombat class does have a method
- <methodname>setDirection(int direction)</methodname>. Call it
- inserting different values by right clicking on a wombat
- instance. How do entered values relate to directions of a
- wombat's movement? You may evaluate the result by actually
- watching its moving direction. Is there another way?</para>
- </question>
+ <para>Hint: The <productname>Greenfoot</productname> framework
+ allows you to inspect an object's internal attribute
+ values.</para>
+ </question>
- <answer>
- <para>Only integer values from {0,1,2,3} relate to
- directions:</para>
+ <answer>
+ <para>Only integer values from {0,1,2,3} relate to
+ directions:</para>
- <informaltable border="1" width="40%">
- <colgroup width="45%"/>
+ <informaltable border="1" width="40%">
+ <colgroup width="45%"/>
- <colgroup width="55%"/>
+ <colgroup width="55%"/>
- <tr>
- <th>Integer value</th>
+ <tr>
+ <th>Integer value</th>
- <th>Direction</th>
- </tr>
+ <th>Direction</th>
+ </tr>
- <tr>
- <td>0</td>
+ <tr>
+ <td>0</td>
- <td>East</td>
- </tr>
+ <td>East</td>
+ </tr>
- <tr>
- <td>1</td>
+ <tr>
+ <td>1</td>
- <td>West</td>
- </tr>
+ <td>West</td>
+ </tr>
- <tr>
- <td>2</td>
+ <tr>
+ <td>2</td>
- <td>North</td>
- </tr>
+ <td>North</td>
+ </tr>
- <tr>
- <td>3</td>
+ <tr>
+ <td>3</td>
- <td>South</td>
- </tr>
+ <td>South</td>
+ </tr>
- <tr>
- <td>other</td>
+ <tr>
+ <td>other</td>
- <td>No effect</td>
- </tr>
- </informaltable>
+ <td>No effect</td>
+ </tr>
+ </informaltable>
- <para>We may right click on a wombat to inspect its internal
- state as in the following screenshot:</para>
+ <para>We may right click on a wombat to inspect its internal
+ state as in the following screenshot:</para>
- <mediaobject>
- <imageobject>
- <imagedata fileref="Ref/Fig/wombatDirection.png"/>
- </imageobject>
- </mediaobject>
- </answer>
- </qandaentry>
- </qandadiv>
- </qandaset>
- </section>
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/wombatDirection.png"/>
+ </imageobject>
+ </mediaobject>
+ </answer>
+ </qandaentry>
+ </qandadiv>
+ </qandaset>
</section>
- </chapter>
- <chapter xml:id="sd1CrabExample">
- <title>Gf 2. The first program: Little crab</title>
-
- <itemizedlist>
- <listitem>
- <para>Inheritance</para>
- </listitem>
-
- <listitem>
- <para>assignments</para>
- </listitem>
-
- <listitem>
- <para>logical expressions / booleans / conditional execution</para>
- </listitem>
-
- <listitem>
- <para>if statements evaluate boolean conditions. Variants:</para>
-
- <itemizedlist>
- <listitem>
- <para>complex boolean conditions</para>
- </listitem>
-
- <listitem>
- <para>Nested if statements</para>
- </listitem>
-
- <listitem>
- <para>possible else branch</para>
- </listitem>
- </itemizedlist>
- </listitem>
-
- <listitem>
- <para>Replacing expressions in <code>if</code> clauses by single
- <code>boolean</code> values.</para>
- </listitem>
-
- <listitem>
- <para>Code conventions:</para>
-
- <itemizedlist>
- <listitem>
- <para>Indentation</para>
- </listitem>
-
- <listitem>
- <para>Capital/small letter conventions</para>
- </listitem>
-
- <listitem>
- <para><code>snake_case</code> vs. <code>CamelCase</code>.</para>
- </listitem>
-
- <listitem>
- <para>Comment formats <code>// this is a comment</code> and
- <code>/* I like comments! */</code>.</para>
- </listitem>
-
- <listitem>
- <para>Comment conventions / Comments and
- <productname>Javadoc</productname></para>
- </listitem>
- </itemizedlist>
- </listitem>
-
- <listitem>
- <para>Repeating object inspection in
- <productname>Greenfoot</productname>.</para>
- </listitem>
- </itemizedlist>
-
- <qandaset xml:id="sd1QandCrabStatesIf">
- <title>Adding complex behaviour</title>
+ <section xml:id="sd1EnhanceCrabMove">
+ <title>Enhancing crabs' movements</title>
- <qandadiv>
- <qandaentry>
- <question>
- <para>After finishing <productname>Greenfoot</productname>
- exercise 2.14 you are asked to change a crab's behaviour with
- respect to edges. Instead of turning by a constant angle when
- hitting an edge our crab shall:</para>
+ <qandaset xml:id="sd1QandCrabStatesIf">
+ <title>Adding complex behaviour</title>
- <itemizedlist>
- <listitem>
- <para>Turn by 5 degrees when hitting an edge for the first
- time</para>
- </listitem>
+ <qandadiv>
+ <qandaentry>
+ <question>
+ <para>After finishing <productname>Greenfoot</productname>
+ exercise 2.14 you are asked to change a crab's behaviour with
+ respect to edges. Instead of turning by a constant angle when
+ hitting an edge our crab shall:</para>
- <listitem>
- <para>Turn by 15 degrees when hitting an edge for the second
- time</para>
- </listitem>
+ <itemizedlist>
+ <listitem>
+ <para>Turn by 5 degrees when hitting an edge for the first
+ time</para>
+ </listitem>
- <listitem>
- <para>Turn by 20 degrees when hitting an edge for the third
- time</para>
- </listitem>
+ <listitem>
+ <para>Turn by 15 degrees when hitting an edge for the second
+ time</para>
+ </listitem>
- <listitem>
- <para>Restart this sequence with 5 degrees again.</para>
- </listitem>
- </itemizedlist>
+ <listitem>
+ <para>Turn by 20 degrees when hitting an edge for the third
+ time</para>
+ </listitem>
- <para>The above sequence may be characterized by letting our crabs
- cycle through the following three internal states:</para>
+ <listitem>
+ <para>Restart this sequence with 5 degrees again.</para>
+ </listitem>
+ </itemizedlist>
- <mediaobject>
- <imageobject>
- <imagedata fileref="Ref/Fig/turningStates.fig"/>
- </imageobject>
- </mediaobject>
+ <para>The above sequence may be characterized by letting our
+ crabs cycle through the following three internal states:</para>
- <para>In order to achieve this behaviour you have to keep track of
- a crab's internal state. This may be achieved by introducing a new
- attribute <code>nextTurningAngle</code> of type
- <code>int</code>:</para>
+ <mediaobject>
+ <imageobject>
+ <imagedata fileref="Ref/Fig/turningStates.fig"/>
+ </imageobject>
+ </mediaobject>
- <programlisting>public class Crab extends Animal {
+ <para>In order to achieve this behaviour you have to keep track
+ of a crab's internal state. This may be achieved by introducing
+ a new attribute <code>nextTurningAngle</code> of type
+ <code>int</code>:</para>
+
+ <programlisting>public class Crab extends Animal {
<emphasis role="bold">int nexturningAngle = 5;</emphasis> // Initial value
@@ -643,21 +584,21 @@
}
}</programlisting>
- <para>Though not strictly required your code will become cleaner
- when using multiple <code>if ... else</code> if statements. Note
- also that <code>if</code> statements may be nested.</para>
- </question>
-
- <answer>
- <para>The desired behaviour may be achieved by introducing a
- nested if clause <coref linkend="sd1ExtendCrabStates"/> within the
- given if clause testing for reaching our world's end. We also
- introduce a variable <code>nextTurningAngle</code> <coref
- linkend="sd1VarCrabState"/> of integer type to keep track of each
- crab's current state and initialize its value to the first of our
- three states:</para>
-
- <programlisting>public class Crab extends Animal {
+ <para>Though not strictly required your code will become cleaner
+ when using multiple <code>if ... else</code> if statements. Note
+ also that <code>if</code> statements may be nested.</para>
+ </question>
+
+ <answer>
+ <para>The desired behaviour may be achieved by introducing a
+ nested if clause <coref linkend="sd1ExtendCrabStates"/> within
+ the given if clause testing for reaching our world's end. We
+ also introduce a variable <code>nextTurningAngle</code> <coref
+ linkend="sd1VarCrabState"/> of integer type to keep track of
+ each crab's current state and initialize its value to the first
+ of our three states:</para>
+
+ <programlisting>public class Crab extends Animal {
int nextTurningAngle = 5; <co xml:id="sd1VarCrabState"/> // Crabs start in state 1
@@ -678,70 +619,70 @@
}
}</programlisting>
- <para>Although the above code satisfies our demands completely it
- suffers from the following flaws:<glosslist>
- <glossentry>
- <glossterm>Readability</glossterm>
-
- <glossdef>
- <para>Without further explanation this code is difficult
- to understand. The connection between these three numeric
- values is not obvious.</para>
- </glossdef>
- </glossentry>
-
- <glossentry>
- <glossterm>Maintainability</glossterm>
-
- <glossdef>
- <para>Changing the underlying three directions to a new
- set of different values (i.e. 7, 42, 13) in a consistent
- manner is error prone: For (nearly) each value we will
- have to change both the if clause and the corresponding
- assignment.</para>
- </glossdef>
- </glossentry>
- </glosslist></para>
-
- <para>We may improve both our code's readability and
- maintainability by introducing three integer constants
- corresponding to our crabs distinct states:</para>
-
- <programlisting>public class Crab extends Animal {
+ <para>Although the above code satisfies our demands completely
+ it suffers from the following flaws:<glosslist>
+ <glossentry>
+ <glossterm>Readability</glossterm>
+
+ <glossdef>
+ <para>Without further explanation this code is difficult
+ to understand. The connection between these three
+ numeric values is not obvious.</para>
+ </glossdef>
+ </glossentry>
+
+ <glossentry>
+ <glossterm>Maintainability</glossterm>
+
+ <glossdef>
+ <para>Changing the underlying three directions to a new
+ set of different values (i.e. 7, 42, 13) in a consistent
+ manner is error prone: For (nearly) each value we will
+ have to change both the if clause and the corresponding
+ assignment.</para>
+ </glossdef>
+ </glossentry>
+ </glosslist></para>
+
+ <para>We may improve both our code's readability and
+ maintainability by introducing three integer constants
+ corresponding to our crabs distinct states:</para>
+
+ <programlisting>public class Crab extends Animal {
// These definitions are not strictly required but do help
// understanding the code
final <co linkends="sd1CrabStateConstants-1"
- xml:id="sd1CrabStateConstants-1-co"/> static <co
- linkends="sd1CrabStateConstants-2"
- xml:id="sd1CrabStateConstants-2-co"/> int state1 = 5,
+ xml:id="sd1CrabStateConstants-1-co"/> static <co
+ linkends="sd1CrabStateConstants-2"
+ xml:id="sd1CrabStateConstants-2-co"/> int state1 = 5,
state2 = 15,
state3 = 20;
...</programlisting>
- <calloutlist>
- <callout arearefs="sd1CrabStateConstants-1-co"
- xml:id="sd1CrabStateConstants-1">
- <para>The Java keyword <code>final</code> asserts that all
- following value assignments must not be changed subsequently.
- So a later assignment attempt like e.g. <code>state2 =
- 1000;</code> will be flagged as an (compile time) error: We
- want these values to be constant!</para>
- </callout>
-
- <callout arearefs="sd1CrabStateConstants-2-co"
- xml:id="sd1CrabStateConstants-2">
- <para>The Java keyword <code>static</code> instructs the
- compiler to share these three values among all possible crab
- instances: They are being defined on class level rather than
- on object (instant) level. Each crab may be i a different
- state but there are only three possible state values</para>
- </callout>
- </calloutlist>
-
- <para>Our complete implementation now reads:</para>
-
- <programlisting>public class Crab extends Animal {
+ <calloutlist>
+ <callout arearefs="sd1CrabStateConstants-1-co"
+ xml:id="sd1CrabStateConstants-1">
+ <para>The Java keyword <code>final</code> asserts that all
+ following value assignments must not be changed
+ subsequently. So a later assignment attempt like e.g.
+ <code>state2 = 1000;</code> will be flagged as an (compile
+ time) error: We want these values to be constant!</para>
+ </callout>
+
+ <callout arearefs="sd1CrabStateConstants-2-co"
+ xml:id="sd1CrabStateConstants-2">
+ <para>The Java keyword <code>static</code> instructs the
+ compiler to share these three values among all possible crab
+ instances: They are being defined on class level rather than
+ on object (instant) level. Each crab may be i a different
+ state but there are only three possible state values</para>
+ </callout>
+ </calloutlist>
+
+ <para>Our complete implementation now reads:</para>
+
+ <programlisting>public class Crab extends Animal {
// A crab is in exactly one of these states:
final static int state1 = 5,
@@ -766,10 +707,11 @@
move();
}
}</programlisting>
- </answer>
- </qandaentry>
- </qandadiv>
- </qandaset>
+ </answer>
+ </qandaentry>
+ </qandadiv>
+ </qandaset>
+ </section>
<section xml:id="sw1Gf3.1">
<title><productname>Greenfoot</productname> 3.1, <quote>Adding random
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