code: public VirtualNetworkLinkInner beginCreateOrUpdate(String resourceGroupName, String privateZoneName, String virtualNetworkLinkName, VirtualNetworkLinkInner parameters, String ifMatch, String ifNoneMatch) {
          return beginCreateOrUpdateWithServiceResponseAsync(resourceGroupName, privateZoneName, virtualNetworkLinkName, parameters, ifMatch, ifNoneMatch).toBlocking().single().body();
      }
docs: Creates or updates a virtual network link to the specified Private DNS zone.
  
  @param resourceGroupName The name of the resource group.
  @param privateZoneName The name of the Private DNS zone (without a terminating dot).
  @param virtualNetworkLinkName The name of the virtual network link.
  @param parameters Parameters supplied to the CreateOrUpdate operation.
  @param ifMatch The ETag of the virtual network link to the Private DNS zone. Omit this value to always overwrite the current virtual network link. Specify the last-seen ETag value to prevent accidentally overwriting any concurrent changes.
  @param ifNoneMatch Set to '*' to allow a new virtual network link to the Private DNS zone to be created, but to prevent updating an existing link. Other values will be ignored.
  @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 VirtualNetworkLinkInner object if successful.