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