class A
{
   public class B              
   {
      public void methodB1()
      {
         System.out.println("Hello World !");
      }
   }

   public B x;

   A()  // Constructor
   {
      x = new B();
   }

   public void methodA1()
   {
      System.out.println("Good-bye World !");
   }
}

public class instanceInner
{
   public static void main(String[] args)
   {
      A x = new A();      // defining variable

      x.x.methodB1();           // Invoking method
   }
}