code: public CancelSpotFleetRequestsResult withUnsuccessfulFleetRequests(CancelSpotFleetRequestsErrorItem... unsuccessfulFleetRequests) {
          if (this.unsuccessfulFleetRequests == null) {
              setUnsuccessfulFleetRequests(new com.amazonaws.internal.SdkInternalList<CancelSpotFleetRequestsErrorItem>(unsuccessfulFleetRequests.length));
          }
          for (CancelSpotFleetRequestsErrorItem ele : unsuccessfulFleetRequests) {
              this.unsuccessfulFleetRequests.add(ele);
          }
          return this;
      }
docs: <p>
  Information about the Spot Fleet requests that are not successfully canceled.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setUnsuccessfulFleetRequests(java.util.Collection)} or
  {@link #withUnsuccessfulFleetRequests(java.util.Collection)} if you want to override the existing values.
  </p>
  
  @param unsuccessfulFleetRequests
  Information about the Spot Fleet requests that are not successfully canceled.
  @return Returns a reference to this object so that method calls can be chained together.