In Java, is it possible to cast to void (not Void)?

Is there anything I can put in X, to make the follow work:

Object o = (void) 开发者_开发知识库X;

void is notionally a primitive. (though most would disagree it is even that I suspect) You cannot cast an object to it.

The closest you can come to this is an InvocationHandler can return null for a void method and a void method invoke()ed via reflection will return null.

Maybe this discussion might be of interest: Uses for the Java Void Reference Type?, it covers about everything you can do with Void and what it's good for.

Java is not C++. In Java, void is not a type, it is a placeholder that means "no return value".

No. You can set x = null; if you wish though?