Question

class Board {
    Direction[][] board;
    Integer width;
    Integer height;

    Board(Integer width, Integer height) {
        this.width = width;
        this.height = height;

        board = new Direction[width][height];

        for (Integer y = 0; y < height; y++) {
            for (Integer x = 0; x < width; x++) {
                board[x][y] = Direction.Down;
            }
        }   
    }

    Direction direction(Integer x, Integer y) {
        return board[x][y];
    }

    void update(Integer x, Integer y) {
        board[x][y].next();
    }
}

The enumerated values in Direction are: Up or Down

Firstly, I want to initialise my board so that all the initial values at every place of the board are set to Down.

Secondly, I want to retrieve the value at a particular (x,y) position of of the board

Thirdly, I want to be able to update the value at that particular element of the board. The next() function is designed to change the value from Down to Up or vice versa. This is declared separately.

I believe I am doing something wrong as the code compiles, however my program doesn’t work as it should.

Answer 1

Most likely, you want to change your update code to be:

board[x][y] = board[x][y].next();

Of course, I’m assuming a lot about what’s not working with your code, but it’s a common mistake I’ve seen before.