Java求出任意数字的各个位数之和方式

import java.util.Scanner;

public class test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		System.out.print("请输入一个数字:");
		int num = sc.nextInt();
		int sum=0;
		while(num!=0){
			sum = sum + num%10;
			num = num/10;
		}
		System.out.println("所给数字的各个位数之和为："+sum);		
	} 
}

sum=sum+n;

package lqp; 
import java.util.Scanner;
 

public class code_2_6 {
 
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner input = new Scanner(System.in);
		System.out.println("Enter a number between 0 and 1000: ");
		int a = input.nextInt();
		int b = code_2_6.numberSum(a);
		System.out.print("The sum of the digist is "+b);
	}
	public static int numberSum(int a){
		int n = a%10;
		a = a-n;
		int m = a/10;
		int sum=0;
		sum = sum+n;
		
		while(m!=0)
		{
			sum = sum+m%10;
			m=m/10;
		}
		return sum;
	} 
}