code: public ServiceFuture<PrivateZoneInner> getByResourceGroupAsync(String resourceGroupName, String privateZoneName, final ServiceCallback<PrivateZoneInner> serviceCallback) {
          return ServiceFuture.fromResponse(getByResourceGroupWithServiceResponseAsync(resourceGroupName, privateZoneName), serviceCallback);
      }
docs: Gets a Private DNS zone. Retrieves the zone properties, but not the virtual networks links or the record sets within the zone.
  
  @param resourceGroupName The name of the resource group.
  @param privateZoneName The name of the Private DNS zone (without a terminating dot).
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object