in onemethod:
public static void fancySquare(int n)
{
   for(int i = 1; i <= n; i++)
   {
      for(int j = 1; j <= n; j++)
      {
         if(j == 1 || j == n || i == j || i == 1 || i == n || i + j == n + 1)
         {
         System.out.print("*");
           if(j == 1 && i == 1 || j == n && i == n)
           {
           System.out.print("@");
           }
         }
         else
         {
         System.out.print(" ");
         }
      }
    System.out.println();
   }
   System.out.println()