Development Flash ActionScript

package {
  import flash.display.*;
  import flash.net.*;
  import flash.events.*;
  public class Main extends Sprite {
    public function Main() {
      var urlLoader:URLLoader = new URLLoader(  );
      urlLoader.addEventListener(Event.COMPLETE,
                                 completeListenerA,
                                 false,
                                 0);
      urlLoader.addEventListener(Event.COMPLETE,
                                 completeListenerB,
                                 false,
                                 1);
      urlLoader.load(new URLRequest("someFile.txt"));
    }
    private function completeListenerA (e:Event):void {
      trace("Listener A: Load complete");
    }
    private function completeListenerB (e:Event):void {
      trace("Listener B: Load complete");
    }
  }
}