import java.util.Scanner;public class add { public static int sumDigits(long n){  int sum=0;  while(n>0){   int m=(int)(n%10);   sum=sum+m;   n=n/10;  }  return sum; } public static void main(String[] args) {  try{   System.out.println("请输入数字：");   Scanner sc=new Scanner(System.in);   long l=sc.nextLong();   System.out.println("输入数字的各位数之和为"+sumDigits(l));  }catch(Exception e){   System.out.println("您输入的不是数字！");  } }}