code: public VirtualNetworkRuleInner update(String resourceGroupName, String accountName, String virtualNetworkRuleName) {
          return updateWithServiceResponseAsync(resourceGroupName, accountName, virtualNetworkRuleName).toBlocking().single().body();
      }
docs: Updates the specified virtual network rule.
  
  @param resourceGroupName The name of the Azure resource group.
  @param accountName The name of the Data Lake Store account.
  @param virtualNetworkRuleName The name of the virtual network rule to update.
  @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 VirtualNetworkRuleInner object if successful.