Hadamard java in a pgm

Hadamard.java

public class Hadamard

{

   public static void main(String[] args)

{     

      int N = Integer.parseInt(args[0]);

      boolean[][] H = new boolean[N][N];

     

      H[0][0] = true;

      for (int n = 1; n < N; n += n)

      {

         for (int i = 0; i < n; i++)

         {

            for (int j = 0; j < n; j++)

            {

               H[i+n][j]   =  H[i][j];

               H[i][j+n]   =  H[i][j];

               H[i+n][j+n] = !H[i][j];

            }

         }

      }

      for (int i = 0; i < N; i++)

      {

         for (int j = 0; j < N; j++)

         {

            if (H[i][j])

            System.out.print("* ");

            else       

            System.out.print(". ");

         }

         System.out.println();

      }

   }

         }