code: public DescribeFleetUtilizationRequest withFleetIds(String... fleetIds) {
          if (this.fleetIds == null) {
              setFleetIds(new java.util.ArrayList<String>(fleetIds.length));
          }
          for (String ele : fleetIds) {
              this.fleetIds.add(ele);
          }
          return this;
      }
docs: <p>
  Unique identifier for a fleet(s) to retrieve utilization data for. To request utilization data for all fleets,
  leave this parameter empty.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setFleetIds(java.util.Collection)} or {@link #withFleetIds(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param fleetIds
  Unique identifier for a fleet(s) to retrieve utilization data for. To request utilization data for all
  fleets, leave this parameter empty.
  @return Returns a reference to this object so that method calls can be chained together.