@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Position other = (Position) obj;
		if (column == null) {
			if (other.column != null)
				return false;
		} else if (!column.equals(other.column))
			return false;
		if (row == null) {
			if (other.row != null)
				return false;
		} else if (!row.equals(other.row))
			return false;
		return true;
	}