code: public void setDemographicBreakdowns(com.google.api.ads.admanager.axis.v201902.GrpDemographicBreakdown[] demographicBreakdowns) {
          this.demographicBreakdowns = demographicBreakdowns;
      }
docs: Sets the demographicBreakdowns value for this AvailabilityForecast.
  
  @param demographicBreakdowns   * The forecast result broken down by demographics.