A super class object can refer its subclass object

class Sample{
}
class SubSample extends Sample{
}
class InheritanaceDemo8{
 public static void main(String[] args){
  Sample s1 = new Sample();
  Sample s2 = new SubSample();
  System.out.println("s1 = " + s1);
  System.out.println("s2 = " + s2);
 }
}
output:
s1 = Sample@010b30a7
s2 = SubSample@1a758cb