In order to avoid this compiler error issue, we may choose an approach to
use generic type for method level.
see the following code. Although from type safety perspective, there are
quite strange things involved here..
Originally I considered to use super(e.g, <? super I>) for anonymous type,
but looks like Java does support this syntax in quite restricted place.
----------------
public class Main {
static class A {
List<?> ts;
public List<?> getList() {
return ts;
}
public void setList(List<?> ts) {
this.ts = ts;
}
}
interface I {
String getName();
}
static class B {
List<? extends I> ts;
public <T> List<T> getList() {
return (List<T>)ts;
}
public void setList(List<? extends I> ts) {
this.ts = ts;
}
}
class J implements I {
String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
public static void main(String[] args) {
{
A a = new A();
a.setList(new ArrayList<Integer>());
List<Object> list = (List<Object>)a.getList();
//List<Object> list = a.getList(); // error
}
{
B b = new B();
b.setList(new ArrayList<J>());
List<I> list1 = b.getList();
List<J> list2 = b.getList();
List<Object> list3 = b.getList(); // OK
b.getList().add(new Integer(4));
}
}
}
On Mon, Jan 24, 2011 at 12:45 PM, Greg Brown <[email protected]> wrote:
> > Another thought, ListView should not implement List interface? basically
> > a ListView/TableView are lists with an extra graphics support.
>
> No, ListView and TableView are views on the model data provided by a List.
>
> G
>
>
>
--
Cheers,
calathus
