My brain hurts. I love Iterable, In this example, I'm trying to
define a Parent interface which iterates a sub-list of it's self
type. But I want to be able to inherit to Child and change the
Iterator to Child. Which in theory should work because Child is a sub
class of Parent. I would expect any code which can operate on Child,
be able to operate on Parent.
My IDE thinks the "for (Parent p2 : parent)" loops are valid, but they
don't compile. I think the problem is I'm not actually implementing
Parent with any Generic type info.. but I can't find any type
combinations which work. And I'd prefer to not have the implementor
need to pass the type info.
interface Parent<T extends Parent<T>> extends Iterable<T> {
}
interface Child<T extends Child<T>> extends Parent<T> {
}
class ParentImpl implements Parent {
public Iterator<Parent> iterator() {
List<Parent> list = new ArrayList<Parent>();
list.add(new ParentImpl());
return list.iterator();
}
}
class ChildImpl implements Child {
public Iterator<Child> iterator() {
List<Child> list = new ArrayList<Child>();
list.add(new ChildImpl());
return list.iterator();
}
}
public class Tester {
public static void main(String[] args) {
Parent parent = new ParentImpl();
for (Parent p2 : parent) {
System.out.println("> " + p2);
for (Parent p3 : p2) {
System.out.println(">> " + p3);
}
}
Parent p = parent.iterator().next();
Child child = new ChildImpl();
for (Child c2 : child) {
System.out.println("> " + c2);
for (Child c3 : c2) {
System.out.println(">> " + c3);
}
}
Child c = child.iterator().next();
}
}
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups "The
Java Posse" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/javaposse?hl=en
-~----------~----~----~----~------~----~------~--~---
