Re: iterator over superclass of collection

From:

Lew <lew@nospam.lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Tue, 17 Apr 2007 23:46:11 -0400

Message-ID:

<KqadnSnKdOEZCbjbnZ2dnUVZ_smonZ2d@comcast.com>

Tom Hawtin <usenet@tackline.plus.com> writes:

I mean just use the iterator straight from the vector:

    public Iterator<? extends Aye> iterator() {
        return ayes.iterator();
    }

Frank Fredstone wrote:

But then that wouldn't match Iterable<Aye>.

No, but it would give you what you need from an iterator.

Does this give you enough of what you want?

<scce>
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
public class WildIteration
{
   static interface Aye
   {
     void doIt();
   }

   static class PrivateAye implements Aye
   {
     public void doIt()
     {
       System.out.println( "PrivateAye.doIt()" );
     }
   }

   public static void main( String [] args )
   {
     List<PrivateAye> pis = new ArrayList<PrivateAye>();
     pis.add( new PrivateAye() );

     Collection <? extends Aye> c = pis;
     Iterator<? extends Aye> it = c.iterator();
     while ( it.hasNext() )
     {
       Aye aye = it.next();
       aye.doIt();
     }
   }
}
</scce>

--
Lew