Java function that calculates the sum of digits for a given char array consisting of the digits '0' to '9'. The function should return the digit sum as a long value

CODE:

import java.util.*;
class prac3B
{
public static void main(String args[])
{
Scanner ob=new Scanner(System.in);
System.out.print("Enter the any string: ");
String s=ob.nextLine();
count(s);
}

public static void count(String str)
{
int sum=0;
int d=0;
char ch[]=str.toCharArray();
for(int i=0;i<str.length();i++)
{
if(Character.isDigit(ch[i]))
{
sum+=Character.getNumericValue(ch[i]);
}

}
System.out.println("Your addtion is: "+sum);
}
}