code: public VirtualNetworkInner createOrUpdate(String resourceGroupName, String virtualNetworkName, VirtualNetworkInner parameters) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, virtualNetworkName, parameters).toBlocking().last().body();
      }
docs: Creates or updates a virtual network in the specified resource group.
  
  @param resourceGroupName The name of the resource group.
  @param virtualNetworkName The name of the virtual network.
  @param parameters Parameters supplied to the create or update virtual network operation
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the VirtualNetworkInner object if successful.