public class Test : MonoBehaviour {



	void Start () {

		List<A> alist = new List<A>();

		alist.Add (new B ());

		alist.Add (new E ());

		alist [0].Say (); //结果打印 A say

		alist [1].Say (); //结果打印 E say

	}

	



	public interface C{

		void Say();

	}



	public class A:C{

		public virtual void Say(){

			Debug.Log ("A say");

		}

	}



	public class D:A{

		public virtual void Say(){

			Debug.Log ("D say");

		}

	}



	// B->D->A  

	public class B:D{

		public override void Say(){

			Debug.Log ("B say");

		}

	}



	//E->A

	public class E:A{

		public override void Say(){

			Debug.Log ("E say");

		}

	}

}