How do you tell the difference between an object that is the String class, and an object that represents the String class? If you can call .toString on it, and you can compare it to other classes, and you can call .newInstance, then how is it more of a representation than being the actual thing?
> How do you tell the difference between an object that is the String class, and an object that represents the String class?
Hah, I think "an object that is the String class" begs the question :-). I think that `String.class` is an object because you can do objecty things with it (call methods, assign it to a variable etc) and `String` is not an object because you can't do any of those things with it.
To me they're not the same kind of thing, though they're intimately, inseparably and exclusively related. I personally would say even if
new String()
was just syntactic sugar for
String.class.newInstance()
, and all other "bare" uses of `String` were similarly shorthands for operations on `String.class`, I'd still hesitate to say that `String` itself was an object.
My logic is probably less useful than yours, though. I'd say "`A` is a `class`, but `a` is an instance of `Class`" and in your system where `A` and `a` are "the same thing" there's no difference between being a `class` and being an instance of `Class`. Because the things appear in different namespaces (as you say), and are related one-to-one, we could as well say they are two ways to refer to "the same thing", with different operations possible "depending on the phrasing."
Shrugs, it doesn't come naturally to me, but it's at least a self-consistent system.
In java you have to call the special and awkward .newInstance rather than being able to use standard "new". Whereas in e.g. Python I can equally well do
>>> str("foo")
'foo'
>>> x = str
>>> x("foo")
'foo'
and the "builtin" str and "userspace" x are equally first-class.
in Java, how do I get an object that can take the place of String in that expression? String.class has some relationship with the "String" in the code I quoted, but it's not the same thing; the thing that I apply new to is not a thing I can call methods on, and the thing that I can call methods on is not a thing I can apply new to.