Consider the following code segment. What is printed when it is executed?

public class Main {
    public static void main(String[] args) {
        int[][] array = { {1, 2, 3}, {4, 5, 6} };
        for (int[] row : array) {
            for (int num : row) {
                System.out.print(num + " ");
            }
        }
        System.out.println();
    }
}