Тест — запись в переменную for-each

public class Main {
    public static void main(String[] args) {
        int[] a = {1, 2, 3};
        int sum = 0;
        for (int x : a) {
            x = x * 10;
            sum = sum + x;
        }
        System.out.println(a[0] + " " + sum);
    }
}