03. Sum Even Numbers

import java.util.Arrays;
import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int sum = Arrays                                    // "1 2 3 4 5 6 7 8 9"
                .stream(scanner.nextLine().split(" "))     // ["1", "2", "3", "4", "5", "6", "7", "8", "9"]
                .mapToInt(Integer::parseInt)              // [1, 2, 3, 4, 5, 6, 7, 8, 9]
                .filter(x -> x % 2 == 0)                 // [2, 4, 6, 8]
                .sum();                                 // 2 + 4 + 6 + 8

        System.out.println(sum);                      // 20
    }
}