code: public DescribeHostReservationsResult withHostReservationSet(HostReservation... hostReservationSet) {
          if (this.hostReservationSet == null) {
              setHostReservationSet(new com.amazonaws.internal.SdkInternalList<HostReservation>(hostReservationSet.length));
          }
          for (HostReservation ele : hostReservationSet) {
              this.hostReservationSet.add(ele);
          }
          return this;
      }
docs: <p>
  Details about the reservation's configuration.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setHostReservationSet(java.util.Collection)} or {@link #withHostReservationSet(java.util.Collection)} if
  you want to override the existing values.
  </p>
  
  @param hostReservationSet
  Details about the reservation's configuration.
  @return Returns a reference to this object so that method calls can be chained together.