Separating Digits Of A Number and Sorting in an Array

import java.util.Scanner;

public class sepsort {

    public static void main(String args[])
    {
        Scanner src=new Scanner(System.in);
        System.out.println("Enter the number");
        int a=src.nextInt();
        int b=a;
        int n,sum=0;
        while(a>0)
        {
            n=a%10;
            //System.out.println(n);
            a=a/10;
            sum++;
        }
        int[] arr=new int[sum];
        int i =0;
        while(b>0)
        {
            int n1=b%10;
            arr[i]=n1;
            //System.out.println(n1);
            b=b/10;
            i++;
        }

        /*for(int j=0;j<sum;j++)
        {
            System.out.println(arr[j]);
        }*/

        int m=arr.length;
        int[] arr2=new int[m];
        int p=m-1;
        for(int q=0;q<sum;q++)
        {

              arr2[p]=arr[q];
              p--;

        }

        for(int t=0;t<sum;t++)
        {
            System.out.println("The digit at position "+t+" is "+arr2[t]);
        }


    }

}