I see... but this would i think because Bar "is a" Foo:
class Bar exends Foo {}
List<? extends Foo> list = ...
list.add(new Bar());
Anyway, what your saying is that the generics choice was intentional?
- Brill
On 27-Feb-09, at 3:19 PM, Igor Vaynberg wrote:
list<? extends string> stings=...
strings.add("asd"); <== wont compile
-igor
On Fri, Feb 27, 2009 at 11:13 AM, Adriano dos Santos Fernandes
<[email protected]> wrote:
What do you mean with "read only" here?
Adriano
Igor Vaynberg escreveu:
<? extends Foo> collections are read only, it would be too
inconvenient to make the model collection read only :)
-igor
On Thu, Feb 26, 2009 at 8:34 PM, Jeremy Thomerson
<[email protected]> wrote:
This is what I was commenting on last week on the list (or
earlier this
week). One expects List<? extends Foo> while the other expects
List<Foo>.
I'm not fully convinced yet that the "? extends" is the better
option.
Either way, I think they should be the same.
--
Jeremy Thomerson
http://www.wickettraining.com
On Thu, Feb 26, 2009 at 8:27 PM, Brill Pappin <[email protected]>
wrote:
Roughly what I'm doing is:
class TypeA{}
class TypeAModel extends LoadableDetachableModel< List<TypeA>> {
public List<TypeA> load(){
... do the load ...
return ...
}
}
TypeAModel model = new TypeAModel();
DropDownChoice< TypeA> ddc = new DropDownChoice<TypeA>("id",
model );
which gets complained about... in this case the generic def is
DropDownChoice<List<? extends T>>
I think the problem is that the generic def of the class should
actually
be
DropDownChoice<List<T>> because you are already identifying the
type
when
you create a new instance.
Now... my generics are a bit hazy at this level, because I can
understand
why it was done that way... does anyone with more generics
experience
know
what it should be? Is this a bug that needs filing?
- Brill
On 26-Feb-09, at 6:03 PM, Kaspar Fischer wrote:
On 26.02.2009, at 22:52, Brill Pappin wrote:
For some reason the DropDownChoice component doesn't have the
same
generics as ListView and it will not accept a model that
listview
will,
despite its saying that it will accept an IModel.
Is anyone else having that sort of trouble with DropDownChoice?
- Brill
Can you give us more information on what exactly is not working
for
you?
DropDownChoice indeed does accept a model, see for instance the
example
in
the class description at
http://wicket.apache.org/docs/1.4/org/apache/wicket/markup/html/form/DropDownChoice.html
This works for me.
Kaspar
--
<!-- HTML: -->
<select wicket:id="site">
<option>site 1</option>
<option>site 2</option>
</select>
<ul>
<li wicket:id="site2"><wicket:container wicket:id="sitename"/
></li>
</ul>
// Code
List SITES = Arrays.asList(new String[] {
"The Server Side", "Java Lobby", "Java.Net"
});
form.add(new DropDownChoice("site", SITES));
form.add(new ListView("site2", SITES)
{
@Override
protected void populateItem(ListItem item)
{
item.add(new Label("sitename", item.getModel()));
}
});
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