以下程序做什么？

/*from N o w J a v a . c o m - 时代Java*/

public class Main 

{

   public static void main(String[] args)

   {

      for (int i = 1; i <= 10; i++) 

      {

         for (int j = 1; j <= 5; j++)

            System.out.print('@');


         System.out.println();

      } 

   } 

}