(acil)Java Ödevimde takıldığım noktalar var yardımcı olur musunuz )

 
 import java.util.Scanner; 
  
  
 public class Main { 
  
     public static void main(String[] args) { 
  
         Scanner scanner = new Scanner(System.in); 
  
         System.out.println("Enter the length of the array: "); 
  
         int length = scanner.nextInt(); 
  
         int[] A = new int[length]; 
  
         for (int i = 0; i < length; i++) { 
  
             System.out.println("Enter the element #" + (i + 1)); 
  
             A[i] = scanner.nextInt(); 
  
         } 
  
         System.out.println(checkValidity(A)); 
  
     } 
  
     private static boolean checkValidity(int A[]) { 
  
         if (A.length > 16) 
  
             return false; 
  
         if (A.length % 2 == 1) 
  
             for (int i = 1; i < A.length; i += 2) 
  
                 A[i] *= 2; 
  
         else 
  
             for (int i = 0; i < A.length; i += 2) 
  
                 A[i] *= 2; 
  
         for (int i = 0; i < A.length; i++) 
  
             if (A[i] >= 10) { 
  
                 int sum_of_digits = 0; 
  
                 while (A[i] > 0) { 
  
                     sum_of_digits += A[i] % 10; 
  
                     A[i] = A[i] / 10; 
  
                 } 
  
                 A[i] = sum_of_digits; 
  
             } 
  
         int sum_of_elements = 0; 
  
         for (int aA : A) sum_of_elements += aA; 
  
         return (sum_of_elements % 10 == 0); 
  
     } 
  
 }