Thread: Stumped by while loop results

My program compiles and runs fine:

import java.util.*;
 
public class Chapter5Ex1
{
	static Scanner console = new Scanner(System.in);
 
	public static void main(String[] args)
	{
		String input = "";
		int sum = 0, length, add = 1, counter = 0, counter2 = 0;
		long number;
		boolean found = false;
 
 
			counter = 0;
			System.out.println("Enter an integer: ");
			System.out.println();
 
			input = console.next();
			number = Math.abs(Long.parseLong(input));
			input = Long.toString(number);
 
			length = input.length();
 
			//System.out.println("the length is: " + length);
 
			System.out.print(input.substring(0, 1));
 
			while(counter < length - 1)
			{
				System.out.print(" " + input.substring(add, add + 1));
				add++;
				counter++;
			}
			while(counter2 < length)
			{
				sum += number % 10;
				number /= 10;
				counter2++;
			}
			System.out.print(" " + "The sum is: " + sum + "\n" + "\n");
 
	}
}

but I want it to prompt the user again for another integer after the program executes. I have tried a few different loops, sentinel, flagged,
but the second time it runs it gives me out of bonds exception for the counter variable. I have even tried initializing the counter to zero just outside the while(counter < length - 1) loop but I always get that out of bounds exception. Here is an example of the flag controlled loop I tried.

import java.util.*;
 
public class Chapter5Ex1
{
	static Scanner console = new Scanner(System.in);
 
	public static void main(String[] args)
	{
		String input = "";
		int sum = 0, length, add = 1, counter = 0, counter2 = 0;
		long number;
		boolean found = false;
 
			while(!found)
			{
			counter = 0;
			System.out.println("Enter an integer: ");
			System.out.println();
 
			input = console.next();
			number = Math.abs(Long.parseLong(input));
			input = Long.toString(number);
 
			length = input.length();
 
			//System.out.println("the length is: " + length);
 
			System.out.print(input.substring(0, 1));
 
			while(counter < length - 1)
			{
				System.out.print(" " + input.substring(add, add + 1));
				add++;
				counter++;
			}
			while(counter2 < length)
			{
				sum += number % 10;
				number /= 10;
				counter2++;
			}
			System.out.print(" " + "The sum is: " + sum + "\n" + "\n");
	}
	}
}

seohulu, better close your code inside the tags.
And use proper formatting. Use any editor for that.
Thanks.