Alright, so Java doesn't allow the following:
Foo<?> hello = new Foo<?>();
This makes sense-- after all, what's the point of generics if you're just gonna box/unbox everything anyways?
What's weird, is Java does allow this:
Foo<Bar<?>> howdy = new Foo<Bar<?>>();
Granted, this actually accomplishes more, though at some point, there would be a cast to get whatever Bar is working with. But if Java is okay with some specificity, why doesn't it allow this?:
Foo<? extends Mal> bonjour = new Foo<? extends Mal>();
The only reason I ask is I'm fixing to rely on the "wildcard inside a class parameter of a constructor", and would seriously like to know the implications/intent behind it.
EDIT: To clarify my question, on what grounds are these statements allowed/disallowed? I'm aware that "Java doesn't permit wildcards in constructors", but the question is, why all this weirdness? Why aren't bounded wildcards allowed if nested wildcards are okay?