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Data Hiding

If a subclass is having a data member with same name as superclass data member then inside subclass, subclass data member hides superclass data member.
class Sample{
 int a = 5;
}
class SubSample extends Sample{
 int a = 6;
 void display(){
  System.out.println("\n a="+a);
 }
}
class InheritanaceDemo14{
 public static void main(String[] args){
   SubSample s = new SubSample();
   s.display();
   System.out.println("\n s.a="+s.a);
 }
}
output:
a = 6
s.a = 6
Explanation:

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

Explanation:

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