15. What is wrong with the following code fragment? class X { public X(int i) { } } } class Y extends X { public Y() { System.out.println(1); } System.out.println(2); 16. What is the output of the following code? class A { public int i = 10; } class B extends A{ public int i = 20; } public class MainClass { public static void main(String[] args) { A a= new B(); System.out.println(a.i);