I'm new to JAVA, stuck on "int"...Need some help getting this stuff straight, thanks!

Asks the user to enter a 5 digit positive integer

Calculate each digit using integer operations / and %.

Calculate and display the sum of the digits.

Heres what I got so far:

import java.util.Scanner;

/* Mike

* Testing Digits Program

* This is my work

*/

public class Digits

{

public static void main (String [] args)

{

Scanner keyboard = new Scanner (System.in);

System.out.println("Enter a 5 digit number:");

String digits = keyboard.nextLine();

int fi,se,th,fr,ft;

fi = (x/10000);

se = (x%1000)/1000;

th = (x%100)/100;

fr =

ft =

System.out.println()

}

}

I've got this far then i get errors left and right...and I'm looking for a similar question like it in the book and can't seem to find one. And this % is new to me I think I'm using it wrong so i left fr (fourth) and ft (fifth) . For example if i place 12345 i want the program to sum 1+2+3+4+5 which equals displaying 15...Thanks,, any contribution appreciated thanks.