Generics in SimpleListProperty and SimpleObjectProperty

Question

Hi everyone,
My understanding of generics may be shakier than I thought, but I was under the impression that I should be able to have:
public abstract class GenericContainer<E, P extends javafx.beans.property.Property<E>> {}And then subclass as:1. public class ObjectContainer<E> extends GenericContainer<E, SimpleObjectProperty<E>> {}
2. public class ListContainer<E> extends GenericContainer<E, SimpleListProperty<E>> {}Number 1 works fine, but number 2 gives me an error saying that the SimpleListProperty<E> is outside of the bounds of P. I've even tried using Property<ObservableList<E>>> in place of SimpleListProperty (which implements that interface) and it still fails.
Can anyone offer advice as to where I'm going wrong?
Thanks,
Geoff

Answer 1

What is the Generics in java ?Good lovely stuff. Well I think it is, some disagree.
Is it use easy ? Yes.
And what happen when it goes wrongYour dog explodes.
You application does not compile, or you get a runtime error.
list.add(args[ i ]); // no data checkThe compiler does a check for you, it is nice like that. But you can trick the compiler. Moohaha!
String tmp = list.get(i); // cast is not needed.Not needed.
If (I can understand the article) {I'm guessing that is false, as otherwise you would not have posted "What is the Generics in java ?"
System.out.println("What is the existence of you?");Never runs. So I'm guessing it is just some debug junk. Maybe an "assert" would be better here?
System.out.println("I posted it!");You did not post the article, nor did you hint at if you had read the article.
Message was edited by:
mlk