Sum of Squares of Even Numbers (Loop vs Streams)

/*
 * Problem : Process an array.
 * Input   : n, then n integers.
 * Output  : The sum of squares of the even numbers.
 * Approach: Loop with a condition.
 * Time    : O(n)
 * Space   : O(1)
 * Java    : 8 or newer.
 */
import java.util.Scanner;

public class Main {
    // This method solves the task. It receives the input and returns the answer.
    static long solve(int[] a) {
        // Step 1: The sum starts at 0. We use long, because squares can be large.
        long sum = 0;

        // Step 2: Look at every number with a loop.
        for (int value : a) {
            // Step 3: Only even numbers are used. Add the square of the number.
            if (value % 2 == 0) {
                sum += (long) value * value;
            }
        }
        return sum;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int size = scanner.nextInt();
        int[] a = new int[size];
        for (int i = 0; i < size; i++) {
            a[i] = scanner.nextInt();
        }
        System.out.println(solve(a));
    }
}