public class Prac extends Test2{
public static void go(Long n){
System.out.println("Long ");
}
public static void go(Short n){
System.out.println("Short ");
}
public static void go(int n){
System.out.println("int ");
}
public static void main(String[] args) throws IOException{
short y = 6;
long z = 7;
go(y);
go(z);
}
}

main裡面的short是基本型態 比起自動裝箱 Java會先尋找自動寬化後符合的型態吧

原來是這樣,了解了感謝!