Overriding native method names and class names

/**
 * Copyright 9re ( http://wonderfl.net/user/9re )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/5Hzl
 */

package  
{
   import flash.display.Sprite;
	import flash.net.navigateToURL;
	import flash.net.URLRequest;
	import flash.external.ExternalInterface;
	/**
	 * @author 9re
	 *
	 * it is possible to override native method names
	 * and class names but impossible to override package names
	 */
	public class Test extends Sprite
	{
		
		public function Test() 
		{
		    addChild(new SuperClass);
		    
		}
	}
}

import flash.net.URLRequest;
import flash.text.TextField;
import flash.display.Sprite;
import flash.net.navigateToURL;
import flash.external.ExternalInterface;


class ExternalInterface {
    static public function call(functionName:String, ... arguments):* {
        throw new Error("internal class");
    }
}

class BaseClass extends Sprite {
	public var ExternalInterface:Object = { };
	private var tf:TextField;
	
	public function BaseClass () {
		tf = new TextField();
		tf.width = 465;
		tf.height = 465;
		tf.mouseEnabled = false;
		tf.selectable = false;
		addChild(tf);
		
		

       
		ExternalInterface.call = function (functionName:String, ... arguments):* {
	        tf.appendText("\nExternalInterface.call: " + functionName );
	        
	        return null;
	    };
	    
		//flash.net.navigateToURL = navigateToURL;
	}
	
	
	public var flash:Object = {
		net : {
			navigateToURL : function (request:URLRequest, window:String = null):void {
				tf.appendText("flash.net.navigateToURL: " + request.url);
			}
		}
	}
	
	public var navigateToURL:Function = function (request:URLRequest, window:String = null):void {
		tf.appendText("navigateToURL: " + request.url);
	}
	
}

class SuperClass extends BaseClass {
    public function SuperClass() {
			navigateToURL(new URLRequest("http://www.google.com/"), "_blank");
			ExternalInterface.call("console.log", "Hello, world!");
			//flash.net.navigateToURL(new URLRequest("http://www.yahoo.co.jp"), "_blank");
    }
}