ReferenceError: Error #1065: 変数 Greeter は定義されていません。
	at flash.system::ApplicationDomain/getDefinition()
	at MethodInfo-1()

var loader:Loader = new Loader();
var request:URLRequest = new URLRequest("testadc.swf");
var context:LoaderContext = new LoaderContext();
context.applicationDomain = ApplicationDomain.currentDomain;
loader.load(request , context);
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, completeHandler);

function completeHandler(event:Event):void {
	trace("complete!");//←実行時処理されます
	var greeterClassRef:Class = loader.contentLoaderInfo.applicationDomain.getDefinition("Greeter") as Class;
	var greeter:Object = new greeterClassRef();
	trace(greeter.greet());
}

package {
	import flash.display.Sprite;
	
	public class testadc extends Sprite {
		public function testadc(){
		}
	}
}

import flash.display.Sprite;
import flash.text.TextField;

class Greeter {
  private var greeting:String;
  
  public function Greeter() {
	  greeting = "Hello World";
   }
   
  public function greet():String {
	  return greeting;
   }
}