Doxygen example

Replace the unnecessarily large number of doxygen examples with one
doxygen example.

Examples/java/doxygen/example.cxx

@@ -0,0 +1,48 @@
+/* File : example.cxx */
+
+#include "example.h"
+#define M_PI 3.14159265358979323846
+
+/* Move the shape to a new location */
+void Shape::move(double dx, double dy) {
+  x += dx;
+  y += dy;
+}
+
+int Shape::nshapes = 0;
+
+Circle::Circle(double r) : radius(r) {
+  NumCircles++;
+}
+
+double Circle::area() {
+  return M_PI*radius*radius;
+}
+
+double Circle::perimeter() {
+  return 2*M_PI*radius;
+}
+
+Square::Square(double w) : width(w) {
+  NumSquares++;
+}
+
+double Square::area() {
+  return width*width;
+}
+
+double Square::perimeter() {
+  return 4*width;
+}
+
+int NumSquares = 0;
+int NumCircles = 0;
+
+Square MakeSquare(double r) {
+  return Square(r);
+}
+
+Circle MakeCircle(double w) {
+  return Circle(w);
+}
+