@Override
    public String toString() {
        StringBuffer stringBuffer = new StringBuffer();
        for(int row = 0; row < getRowSize(); row++) {
            for(int column = 0; column < getColumnSize(); column++) {
                Integer move = getMoveAt(row, column);
                    String 
                    moveToPrint = "";
                if (move == null) {
                    moveToPrint = " ";
                } else {
                    moveToPrint = move.toString();
                }
                stringBuffer.append("|").append(moveToPrint);
            }
            stringBuffer.append("|\n");
        }
        return stringBuffer.toString();
    }