Go4Expert - Object class problem

Code:

class InstanceTest

{

  public static void main(String [] args)

  {

   InstanceTest ob1=new InstanceTest();

   Object ob2=ob1;

   System.out.println(ob2 instanceof Object);

   System.out.println(ob2 instanceof InstanceTest);

  }

}

I am using jdk1.6
I read this question on a site which tells it's output to be
true
true

But when i tried it on my computer it generated error!!!
can u tell why it happend so,and how to solve it.