一些重写hashCode的方法

    @Override
    public int hashCode() {
        return Objects.hash(interfaceUrl);
    }

    @Override
    public int hashCode() {
        return Objects.hash(this.givenName, this.familyName);
    }

    @Override
    public int hashCode() {
        return this.pnrEntityId.hashCode();
    }

    @Override
    public int hashCode() {
        return System.identityHashCode(this);
    }

    @Override
    public int hashCode() {
        return payMethod.hashCode() + currency.hashCode();
    }

    @Override
    public int hashCode() {
        int result = 1;

        result = 31 * result + (null == this.getDepartureAirport3Code() ? 0 : this.getDepartureAirport3Code().hashCode());
        result = 31 * result + (null == this.getArrivalAirport3Code() ? 0 : this.getArrivalAirport3Code().hashCode());
        result = 31 * result + (null == this.getDepartureTime() ? 0 : this.getDepartureTime().hashCode());
        result = 31 * result + (null == this.getArrivalTime() ? 0 : this.getArrivalTime().hashCode());
        result = 31 * result + (null == this.getSegments() ? 0 : this.getSegments().hashCode());

        return result;
    }