class A
{

}
class B extends A
{
        public static void main(String args[])
        {
            B b = new B();
         
        } 
}
In the above example, B is the class extending the A class.
Means that B is inherited from A.

class A
{
   int a=10;
}
class B extend A
{
 public static void main(String[] a)
  {
     B objB;
     objB=new A();
     System.out.println("Value of a is"+objB.a);
  }
}