public String getCellSymbol() {
        if (rock) {
            return "#";
        } else if (ant != null) {
            return "a";
        } else if (food != 0) {
            return food + "";
        } else {
            switch (anthill) {
                case "red":
                    return "+";
                case "black":
                    return "-";
                default:
                    return ".";
            }
        }
    }