Interfaces

[alexander Patapoff via Digitalmars-d-learn]

is there a way for me to do this in D? In java, one is able to 
create a new instance of an interface.

interface Action
{
  void actions(T t);
}
class testAction
{
  this()
   {
    Action action = new Action()
       {
         void actions(T t){...}
       }
   }

}

I found this feature really useful in java. Is there any way I 
can duplicate this process, without the mixin func?