Question

Can this method return true somehow?

public static <T> boolean isVoid(T t)
{
    return t instanceof Void;
}

Answer 1

Yes, but I’m sure that isn’t really useful:

public static void main(final String[] args) throws Exception {
    final Constructor c = Void.class.getDeclaredConstructors()[0];
    c.setAccessible(true);
    System.out.println(c.newInstance(null) instanceof Void);
}

A Void class can’t be instantiated so normally your code wouldn’t require to deal with Void instances. The above code snippet is just an example of what havoc you can unleash when using reflection… 😉