Working in bluej, after compiling program says "illegal start of
expression" in "public String getAuthor(), but I suposse everything's
correct, isn't it? Tried to save and close and open the programme
again.

/**
    * @return The author of this engine.
    */
   public String getAuthor()
   {
       return "John Doe";
   }

   /**
    * @return The version number of this engine.
    */
   public String getVersion()
   {
       return "version 0.2";
   }