Merge pull request #361 from habibasorour/issue_356_listing

Issue 356 fixed 9. 5 isting

Author: pearcej

source/ch9_commonmistakes.ptx

@@ -148,6 +148,7 @@
         <p>
             Unlike Python, where you can create a new object without explicitly using a keyword, Java requires the <c>new</c> keyword to instantiate a new object.
         </p>
+        <listing xml:id="new-keyword-error">
         <program language="java" interactive="activecode" line-numbers="yes">
             <code>
                 // Histo.java // The filename for this example
@@ -164,8 +165,9 @@
                 } // End of class
             </code>
         </program>
+        </listing>
         <p>
-          This error message occurs when you forget to use the <c>new</c> keyword to instantiate an object. 
+          The error message in <xref ref="new-keyword-error" text="type-global"/> occurs when you forget to use the <c>new</c> keyword to instantiate an object. 
           Specifically, on line 8 of <c>Histo.java</c>, <c>data = Scanner(new File("test.dat"));</c> leads to a 'cannot find symbol' error. 
           While the message states 'symbol: method Scanner(File)', this can be misleading. 
           Java incorrectly interprets <c>Scanner()</c> as an attempt to call a static method named <c>Scanner</c> within the <c>Histo</c> class