move demo documents into separate files

demo/docs/java.java

@@ -0,0 +1,15 @@
+public class InfiniteLoop {
+
+    /*
+     * This will cause the program to hang...
+     *
+     * Taken from:
+     * http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/
+     */
+    public static void main(String[] args) {
+        double d = Double.parseDouble("2.2250738585072012e-308");
+
+        // unreachable code
+        System.out.println("Value: " + d);
+    }
+}