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())); >>>>> } >>>>> }); >>>>> >>>>> >>>>> --------------------------------------------------------------------- >>>>> To unsubscribe, e-mail: [email protected] >>>>> For additional commands, e-mail: [email protected] >>>>> >>>>> >>>>> >>>> >>>> --------------------------------------------------------------------- >>>> To unsubscribe, e-mail: [email protected] >>>> For additional commands, e-mail: [email protected] >>>> >>>> >>>> >> >> ? extends >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [email protected] >> For additional commands, e-mail: [email protected] >> >> > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
