Example: Sum of Digits using String and Stream API in Java

// Sum of Digits using String and Stream API
import java.util.Scanner;
import java.util.Arrays;

// Main class containing the entry point of the program
public class Main {
    public static int sumDigitsStream(int number) {
        return String.valueOf(number)
                     .chars() // Returns an IntStream of char values
                     .map(Character::getNumericValue) // Converts char to int digit
                     .sum(); // Sums all elements in the stream
    }

    public static void main(String[] args) {
        // Step 1: Get input number from the user
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = scanner.nextInt();

        // Step 2: Calculate sum of digits using String and Stream API
        int sum = sumDigitsStream(num);

        // Step 3: Print the result
        System.out.println("Sum of digits (Stream API): " + sum);

        scanner.close();
    }
}