MediaLocator and URL
         String  locatorString  = "vfw://0" ;
   //creating MediaLocator from locatorString
MediaLocator   ml = new MediaLocator( locatorString );

   //creating an URL from locatorString
try{
   url = new URL( locatorString );
}catch( MalformedURLException  e ) {
   System.out.println (e);
}
   // creating MediaLocator from URL
    ml = new MediaLocator( url );