code: public DescribeFleetCapacityResult withFleetCapacity(FleetCapacity... fleetCapacity) {
          if (this.fleetCapacity == null) {
              setFleetCapacity(new java.util.ArrayList<FleetCapacity>(fleetCapacity.length));
          }
          for (FleetCapacity ele : fleetCapacity) {
              this.fleetCapacity.add(ele);
          }
          return this;
      }
docs: <p>
  Collection of objects containing capacity information for each requested fleet ID. Leave this parameter empty to
  retrieve capacity information for all fleets.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setFleetCapacity(java.util.Collection)} or {@link #withFleetCapacity(java.util.Collection)} if you want
  to override the existing values.
  </p>
  
  @param fleetCapacity
  Collection of objects containing capacity information for each requested fleet ID. Leave this parameter
  empty to retrieve capacity information for all fleets.
  @return Returns a reference to this object so that method calls can be chained together.