Widening and boxing

[J Brewer]

I ran the following code,

public class Test {
 
int doX(Long x, Long y) { return 1; }
int doX(long... x) { return 2; }
int doX(Integer x, Integer y) { return 3 ;}
int doX(Number n, Number m) { return 4; }

public static void main(String[] args){
new Test().go();
}
 
void go() {
short s = 7;
System.out.print(doX(s,s) + " " );
System.out.print(doX(7,7));
}
}
 

and I got the same answer as the book, 4 3. However, I don't understand why
the answer is not 3 3. Since s is of type Short, couldn't you box short to Short, then widen Short to Integer? The only answer I can think of is maybe because Short is now an object not a primitive, it is a subclass of Number, not Integer? Is that correct?

[Stephen O'Kane]

you can widen from short to int, but not from Short to Integer, so your reckoning is correct

[J Brewer]

Thanks!