John's thinking

Thinking.java

public interface Foo {
    public void setBar(Bar bar);
}


public class FooFactory {
   private List<Foo> foos;

   public void setFoos(List<Foo> foos) {
     this.foos = foos;
   }

   public void setBar(Bar bar) {
     this.bar = bar;
   }
   
   public List<Foo> fulfill() {
      List<Foo> result = new ArrayList<Foo>();
      for (Foo foo: foos) {
         result.add(foo.setBar(bar));
      }  
      return result; 
   }
}