Added a new Examples folder with modified Examples/java files

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/branches/gsoc2008-cherylfoil@10763 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/doxygencomments/java/callback/main.java

@@ -0,0 +1,56 @@
+public class main
+{
+  static {
+    try {
+        System.loadLibrary("example");
+    } catch (UnsatisfiedLinkError e) {
+      System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e);
+      System.exit(1);
+    }
+  }
+
+  public static void main(String[] args)
+  {
+    System.out.println("Adding and calling a normal C++ callback");
+    System.out.println("----------------------------------------");
+
+    Caller              caller = new Caller();
+    Callback            callback = new Callback();
+    
+    caller.setCallback(callback);
+    caller.call();
+    caller.delCallback();
+
+    callback = new JavaCallback();
+
+    System.out.println();
+    System.out.println("Adding and calling a Java callback");
+    System.out.println("------------------------------------");
+
+    caller.setCallback(callback);
+    caller.call();
+    caller.delCallback();
+
+    // Test that a double delete does not occur as the object has already been deleted from the C++ layer.
+    // Note that the garbage collector can also call the delete() method via the finalizer (callback.finalize())
+    // at any point after here.
+    callback.delete();
+
+    System.out.println();
+    System.out.println("java exit");
+  }
+}
+
+class JavaCallback extends Callback
+{
+  public JavaCallback()
+  {
+    super();
+  }
+
+  public void run()
+  {
+    System.out.println("JavaCallback.run()");
+  }
+}
+