Example: Sum of Digits using String Conversion in Java

// Sum of Digits using String Conversion
import java.util.Scanner;

// Main class containing the entry point of the program
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // Step 1: Get input number from the user
        System.out.print("Enter a non-negative integer: ");
        int number = scanner.nextInt();

        // Step 2: Convert the integer to a string
        String numStr = String.valueOf(number);

        // Step 3: Initialize sum
        int sum = 0;

        // Step 4: Iterate through each character of the string
        for (int i = 0; i < numStr.length(); i++) {
            // Get the character at current index
            char digitChar = numStr.charAt(i);
            // Convert character to integer and add to sum
            sum += Character.getNumericValue(digitChar);
        }

        // Step 5: Print the result
        System.out.println("The sum of digits of " + number + " is: " + sum);

        scanner.close();
    }
}