code: public IPAddressAvailabilityResultInner checkIPAddressAvailability(String resourceGroupName, String virtualNetworkName, String ipAddress) {
          return checkIPAddressAvailabilityWithServiceResponseAsync(resourceGroupName, virtualNetworkName, ipAddress).toBlocking().single().body();
      }
docs: Checks whether a private IP address is available for use.
  
  @param resourceGroupName The name of the resource group.
  @param virtualNetworkName The name of the virtual network.
  @param ipAddress The private IP address to be verified.
  @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 IPAddressAvailabilityResultInner object if successful.