在Flex或Flash开发时，常常需要用到接口，下面是一个简单的接口样例。

package oreilly.cookbook
{
	public interface IDataInterface
	{
		function set dataType(value:Object):void;
		function get dataType():Object;
		function update():Boolean;
		function write():Boolean;
		function readData():Object;
	}
}

接口实现：

package oreilly.cookbook
{
	import flash.events.EventDispatcher;
	import flash.events.IEventDispatcher;
	public class ClientData extends EventDispatcher implements IDataInterface
	{
		private var _dataType:Object;
		public function ClientData(target:IEventDispatcher=null)
		{
			super(target);
		}
		public function set dataType(value:Object):void
		{
			_dataType = value;
		}
		//.....
	}
}

在MXML中实现接口：

<mx:HBox xmlns:mx="http://www.adobe.com/2006/mxml" width="400" height="300" 
		 implements= "IDataInterface">