code: public DescribeReservedInstancesOfferingsResult withReservedInstancesOfferings(ReservedInstancesOffering... reservedInstancesOfferings) {
          if (this.reservedInstancesOfferings == null) {
              setReservedInstancesOfferings(new com.amazonaws.internal.SdkInternalList<ReservedInstancesOffering>(reservedInstancesOfferings.length));
          }
          for (ReservedInstancesOffering ele : reservedInstancesOfferings) {
              this.reservedInstancesOfferings.add(ele);
          }
          return this;
      }
docs: <p>
  A list of Reserved Instances offerings.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setReservedInstancesOfferings(java.util.Collection)} or
  {@link #withReservedInstancesOfferings(java.util.Collection)} if you want to override the existing values.
  </p>
  
  @param reservedInstancesOfferings
  A list of Reserved Instances offerings.
  @return Returns a reference to this object so that method calls can be chained together.