abstract class and instantiation

From: Michael G (mike-g_at_montana.com)
Date: 10/23/04 

Date: Sat, 23 Oct 2004 09:58:42 -0600

I am not sure why, in the RefinedAbstraction class, that the abstract
baseclass' constructor can be called. I have always thought that abstract
classes cannot be instantiated. It is a little confusing. Would it be better
programming practice to simply assign imp to this. imp in the subclass?

thanks, Mike

abstract class Abstraction{

 protected Implementor imp;

 public Abstraction(Implementor imp){

  this.imp = imp;
 }

 abstract void operation();

}

class RefinedAbstraction extends Abstraction{

 public RefinedAbstraction(Implementor imp){

      super(imp); //not sure how this can work.
 }

 public void operation(){

      imp.operationImp();
 }
}

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