@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        FertigungsplanNr that = (FertigungsplanNr) o;

        if (n != null ? !n.equals(that.n) : that.n != null) return false;

        return true;
    }