What Exactly is Happening in this Program???

Question

Hello All,
Here is a Program,
package myDemo;
public class MyOverRidingDemo {
     public MyOverRidingDemo() {
          super();
          // TODO Auto-generated constructor stub
          A obj=new B();
          obj.add();
          System.out.println("Value Of I : "+obj.i);
     * @param args
     public static void main(String[] args) {
          // TODO Auto-generated method stub
          new MyOverRidingDemo();
class A {
     int i=10;
     public void add(){
          System.out.println("Add() in Class A");
class B extends A {
     int i=20;
     public void add(){
          System.out.println("Add() in Class B");
When i run this program, the out put is as follows :
Add() in Class B
Value Of I : 10
It is pretty clear that B is overriding the add() method of Class A.
When an instance of B is made and assigned to a variable of type A,
obj.add() should refer to add of B
and obj.i should refer to i of B.
but over here..why is it Referring to i Of A???

Answer 1

Because both classes have their own copy of int i.
Remove it from the subclass and make the add method change it somehow and you'll see the difference.
And of course the obj.i refers to A's i value since property access isn't dynamic and obj's type is A, not B.