Completing exercise documentation

Doc/Sd1/interfacesAbstractClasses.xml

@@ -136,18 +136,60 @@ public void testApp() {
 }</programlisting>
 
             <para>This interface may be used by the plotter class as a
-            <quote>placeholder</quote> for the intended plot function to be
-            defined as e.g.:</para>
+            <quote>placeholder</quote> for the intended plot function.
+            Plotting e.g. <function>y=sin(x)</function> will then be effected
+            by:</para>
+
+            <programlisting language="none">class MySin implements DoubleOfDoubleFunction {
+
+   @Override
+   public double compute(double x) {
+      return Math.sin(x);
+   }
+}</programlisting>
+
+            <para>Plotting will then require an instance:</para>
+
+            <programlisting language="none">final DoubleOfDoubleFunction sinFunction = new MySin();
+plotter.plot(sinFunction);</programlisting>
           </question>
 
           <answer>
-            <para/>
+            <annotation role="make">
+              <para role="eclipse">Sd1/plot/Basic</para>
+
+              <para>A <quote>standard</quote> plotting example is being
+              provided in class <classname>DriverInterface</classname>.</para>
+            </annotation>
 
-            <para>The above solution contains a variant using Java 8 Lambda
-            expressions which allows for supplying functions as arguments to
-            the plotting facility. This solution will not be covered in the
-            current lecture but you may catch a glimpse of upcoming topics in
-            <quote xml:lang="de">Softwareentwicklung 2</quote>.</para>
+            <para>The solution in addition contains a variant
+            <classname>DriverLambda</classname> using <link
+            xlink:href="http://tutorials.jenkov.com/java/lambda-expressions.html">Java
+            8 lambda expressions</link> which allows for supplying functions
+            as arguments to the plotting facility. This solution will not be
+            covered in the current lecture but you may catch a glimpse with
+            respect to upcoming topics in <quote
+            xml:lang="de">Softwareentwicklung 2</quote>:</para>
+
+            <programlisting language="none">public class DriverLambda {
+
+    /**
+     * @param args Unused
+     */
+    public static void main( String[] args ) {
+        final Plotter plotter = new Plotter();
+        
+        plotter.setNumTics(80, 40);// 80 characters vertical, 40 characters horizontal
+        plotter.setXrange(0, 2 * Math.PI);
+        plotter.setYrange(-1, 1);
+        
+        // Function implementing the underlying interface 
+        // de.hdm_stuttgart.mi.sd1.plot.DoubleOfDoubleFunction
+        // are being conveniently passed as arguments.
+        plotter.plot(<emphasis role="bold">x -&gt; Math.sin(x)</emphasis>);
+        plotter.plot(<emphasis role="bold">x -&gt; Math.cos(x)</emphasis>);
+    }
+}</programlisting>
           </answer>
         </qandaentry>
       </qandadiv>

P/Sd1/plot/Interface/src/main/java/de/hdm_stuttgart/mi/sd1/plot/DriverInterface.java

@@ -25,8 +25,7 @@ public class DriverInterface {
         plotter.setXrange(0, 2 * Math.PI);
         plotter.setYrange(-1, 1);
         
-        DoubleOfDoubleFunction sinFunction = new MySin();
-        
+        final DoubleOfDoubleFunction sinFunction = new MySin();
         plotter.plot(sinFunction);
     }
 }

P/Sd1/plot/Interface/src/main/java/de/hdm_stuttgart/mi/sd1/plot/DriverLambda.java

@@ -17,7 +17,8 @@ public class DriverLambda {
         plotter.setXrange(0, 2 * Math.PI);
         plotter.setYrange(-1, 1);
         
-        // Function implementing the underlying interface
+        // Function implementing the underlying interface 
+        // de.hdm_stuttgart.mi.sd1.plot.DoubleOfDoubleFunction
         // are being conveniently passed as arguments.
         plotter.plot(x -> Math.sin(x));
         plotter.plot(x -> Math.cos(x));