four-in-line/src/PlayField.java

public class PlayField {
    private int width;
    private int height;
    private final char[][] fields;

    public PlayField(int width, int height) {
        this.width = width;
        this.height = height;
        fields = new char[width][height];
        reset();
    }

    public final void setPos(int x, int y, Player player) {
        fields[x][y] = player.getToken();
    }

    public int getWidth() {
        return width;
    }

    public int getHeight() {
        return height;
    }

    public void print() {
        for(int i = 1; i <= width; i++) {
            System.out.print("[" + i + "]");
        }
        System.out.println();
        for(int y = 0; y < height; y++) {
            for(int x = 0; x < width; x++) {
                System.out.print("[" + fields[x][y] + "]");
            }
            System.out.println();
        }
    }

    public void reset() {
        for(int x = 0; x < width; x++) {
            for(int y = 0; y < height; y++) {
                fields[x][y] = ' ';
            }
        }
    }

    public int getFreeY(int x) {
        for(int y = height - 1; y >= 0; y--) {
            if(fields[x][y] == ' ') {
                return y;
            }
        }
        return -1;
    }

    public boolean isDraw() {
        for(int x = 0; x < width; x++) {
            if(getFreeY(x) != 1) {
                return false;
            }
        }
        return true;

    }

    public boolean hasWon(Player player, int y, int x) {
        for(int dir_x = -1; dir_x <= 1; dir_x++) {
            for(int dir_y = -1; dir_y <= 1; dir_y++) {
                if(dir_x == 0 && dir_y == 0) {
                    continue;
                }
                if(checkDirection(player, y, x, dir_y, dir_x)) {
                    return true;
                }
            }
        }
        return false;
    }

    private boolean checkDirection(Player player, int x, int y, int dir_x, int dir_y) {
        char t = player.getToken();
        for(int i = 1; i < 4; i++) {
            int new_x = x + i * dir_y;
            int new_y = y + i * dir_x;
            if(new_x < 0 || new_x >= width || new_y < 0 || new_y >= height
                    || fields[new_x][new_y] != t) {
                return false;
            }
        }
        return true;
    }

}