Counting specific characters in two dimensional array using stream

Question

I would like to count occurrences of a character (for example the space: ' ' ) in 2D Array, using stream. I was trying to find a solution. Here is my code, using a nested loops:

public int countFreeSpaces() {
    int freeSpaces = 0;
    for (int i = 0; i < height; i++) {
        for (int j = 0; j < width; j++) {
            if (board[j][i] == ' ') freeSpaces++;
        }
    }
    return freeSpaces;
}

Answer 1

I believe this answer is slightly more expressive:

int freeSpaces = (int) Arrays.stream(board)
                             .map(CharBuffer::wrap)
                             .flatMapToInt(CharBuffer::chars)
                             .filter(i -> i == ' ')
                             .count();