for语句输出三角形

 public class yuju {

     public static void main(String[] args) {

          for (int i= ; i<; i++)
             {
                  for (int j=; j<=i;j++)
                  {
                      System.out.print("*");
             }
                 System.out.println();
             }

             for (int i=;i<;i++)
             {
            for (int j=;j>=i;j--)
            {
                System.out.print("*");
            }
            System.out.println();
             }

     }

 }