class A {  
  void show() {
    System.out.println("This is class A");
  }  
}  
 
class B extends A {  
  void show(){
    System.out.println("This is class B");
  }  
  
  public static void main(String args[]) {  
   A ob1 = new A();  
    B ob2 = new B();
    ob1.show();
    ob2.show();
  }  
}