It must be somewhere under the hood. Otherwise, it wont be callable and it would require an instance of an object to call. Unless the object here is the Java environment?
If an unnamed class has an instance main method rather than a static main method then launching it is equivalent to the following, which employs the existing anonymous class declaration construct:
new Object() {
// the unnamed class's body
}.main();
No String[] args
They are just optional I’m sure, like C and C++. You still need them to read command line arguments.
Without the preview feature enabled, it is not an optional part of the method signature. It specifically looks for a main(String[]) signature.
I mentioned this uses preview features twice in the first comment regarding this, so I don’t know why you’re "ah ha"ing. Also you don’t need to read the technical document, I’ve quoted the entirety of the relevant text. I provided it as a citation.
You seem confused about preview features. It’s not a switchable mode to reduce boiler plate. I find the name very clear, but here is more information. From JEP-12
A preview feature is a new feature of the Java language, Java Virtual Machine, or Java SE API that is fully specified, fully implemented, and yet impermanent. It is available in a JDK feature release to provoke developer feedback based on real world use; this may lead to it becoming permanent in a future Java SE Platform.
As an example, JDK 17 added pattern matching for switch statements as a preview, and by JDK 21 it was added as a full fledged feature that doesn’t require usage of the enable preview flag. Presumably in some future release of Java this feature will not require the usage of a flag.
Yes, because it’s genuinely not a static method. It’s an instance method. Also the signature is different. It’s not some sort of mere syntactic trick that translates void main() to public static void main(String[] args).
No. From JEP-445:
Without the preview feature enabled, it is not an optional part of the method signature. It specifically looks for a
main(String[])signature.deleted by creator
I mentioned this uses preview features twice in the first comment regarding this, so I don’t know why you’re "ah ha"ing. Also you don’t need to read the technical document, I’ve quoted the entirety of the relevant text. I provided it as a citation.
You seem confused about preview features. It’s not a switchable mode to reduce boiler plate. I find the name very clear, but here is more information. From JEP-12
As an example, JDK 17 added pattern matching for switch statements as a preview, and by JDK 21 it was added as a full fledged feature that doesn’t require usage of the enable preview flag. Presumably in some future release of Java this feature will not require the usage of a flag.
deleted by creator
Yes, because it’s genuinely not a static method. It’s an instance method. Also the signature is different. It’s not some sort of mere syntactic trick that translates
void main()topublic static void main(String[] args).