class SecondMax {
   public static void main(String args[]) throws Exception
   {
      int a[] = {3, 5, 18, 9, 21, 20, 4, 17, 8, 1};
      int i, size, max1, max2;
 
      size = 10;
 
      max1 = a[0];
      max2 = a[1];
 
      for (i = 1; i < size; i++) 
         if (a[i] > max1) {
            max2 = max1;
            max1 = a[i];
         }
         else if (a[i] > max2)
            max2 = a[i];
 
      System.out.println("Dizinin en buyuk ikinci elemani = " + max2);
   }
}