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.