AS3:接口和非公共方法

尽管AS3不支持抽象类,为什么不定义一个类作为抽象类使用,并让它实现该接口并在该类中定义非公共方法呢。

interface IThing {
    function thisMethodIsPublic():void;
}

public class ThingAbstract implements IThing
{
  //throw an Error to avoid calling the class directly, 
  //this class needs to be subclassed
  //and this method overridden
  protected function thisMethodShouldOnlyBeVisibleToCertainClasses():void
  {
     throw new IllegalOperationError
          ('this method should be overriden in a subclass');
  } 

  public function thisMethodIsPublic():void
  {
  }
}