...

    private String vmName;
    private String datacenterName;
    private String stdPortgroupName;
    private String distPortgroupName;
    private String vmId;
    private List<String> createdNics = new ArrayList<String>();
    private Power powerService;
    private Ethernet ethernetService;

...
        this.ethernetService = vapiAuthHelper.getStubFactory().createStub(
            Ethernet.class, this.sessionStubConfig);

        // Get the virtual machine ID
        this.vmId = VmHelper.getVM(vapiAuthHelper.getStubFactory(),
            sessionStubConfig,
            vmName);

        // List all Ethernet adapters of the virtual machine
        List<EthernetTypes.Summary> nicSummaries = this.ethernetService.list(
            this.vmId);
        System.out.println("\n\n#### List of all Ethernet NICS on the VM:\n"
                           + nicSummaries);

        // Get info for each Ethernet adapter on the VM
        System.out.println("\n\n####Print info for each Ethernet NIC on the"
                                   + " vm.");
        for (EthernetTypes.Summary ethSummary : nicSummaries) {
            EthernetTypes.Info ethInfo = this.ethernetService.get(vmId,
                ethSummary.getNic());
            System.out.println(ethInfo);
        }

        // Create Ethernet NIC by using STANDARD_PORTGROUP with default settings
        String stdNetworkId = NetworkHelper.getStandardNetworkBacking(
            this.vapiAuthHelper.getStubFactory(), sessionStubConfig,
            this.datacenterName, this.stdPortgroupName);
        EthernetTypes.CreateSpec nicCreateSpec =
                new EthernetTypes.CreateSpec.Builder().setBacking(
                    new EthernetTypes.BackingSpec.Builder(
                        EthernetTypes.BackingType.STANDARD_PORTGROUP)
                            .setNetwork(stdNetworkId).build()).build();
        String nicId = this.ethernetService.create(this.vmId, nicCreateSpec);
        this.createdNics.add(nicId);
        EthernetTypes.Info nicInfo = this.ethernetService.get(this.vmId, nicId);

       // Update the Ethernet NIC with a different backing
        EthernetTypes.UpdateSpec nicUpdateSpec = new EthernetTypes.UpdateSpec.Builder().setBacking(
                    new EthernetTypes.BackingSpec.Builder(EthernetTypes.BackingType.STANDARD_PORTGROUP)
                            .setNetwork(stdNetworkId).build()).build();
        this.ethernetService.update(this.vmId, lastNicId, nicUpdateSpec);
        nicInfo = this.ethernetService.get(this.vmId, lastNicId);

        // Update the Ethernet NIC configuration
        nicUpdateSpec = new EthernetTypes.UpdateSpec.Builder()
            .setAllowGuestControl(false)
            .setStartConnected(false)
            .setWakeOnLanEnabled(false)
            .build();
        this.ethernetService.update(this.vmId, lastNicId, nicUpdateSpec);
        nicInfo = this.ethernetService.get(this.vmId, lastNicId);
        
        // Powering on the VM to connect the virtual Ethernet adapter to its backing
        this.powerService.start(this.vmId);
        nicInfo = this.ethernetService.get(this.vmId, lastNicId);

        // Connect Ethernet NIC after powering on the VM
        this.ethernetService.connect(this.vmId, lastNicId);
        nicInfo = this.ethernetService.get(this.vmId, lastNicId);

        // Disconnect Ethernet NIC after powering on VM
        this.ethernetService.disconnect(this.vmId, lastNicId);
        nicInfo = this.ethernetService.get(this.vmId, lastNicId);
...