向上转型调用静态方法答疑

class Super {
static void greeting() {
System.out.println("greetingSuper");
}
}

class Sub extends Super {
static void greeting() {
System.out.println("greetingSub");
}
}

public class Test {
public static void main(String[] args) {
Sub s2 = new Sub();
s2.greeting();
Super s3 = new Sub();
s3.greeting();
}
}