@java.lang.Override
  public java.lang.String getVmwareEngineNetworkId() {
    java.lang.Object ref = vmwareEngineNetworkId_;
    if (ref instanceof java.lang.String) {
      return (java.lang.String) ref;
    } else {
      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      vmwareEngineNetworkId_ = s;
      return s;
    }
  }
<pre>
Required. The user-provided identifier of the new VMware Engine network.
This identifier must be unique among VMware Engine network resources
within the parent and becomes the final token in the name URI. The
identifier must meet the following requirements:

* For networks of type LEGACY, adheres to the format:
`{region-id}-default`. Replace `{region-id}` with the region where you want
to create the VMware Engine network. For example, "us-central1-default".
* Only contains 1-63 alphanumeric characters and hyphens
* Begins with an alphabetical character
* Ends with a non-hyphen character
* Not formatted as a UUID
* Complies with [RFC 1034](https://datatracker.ietf.org/doc/html/rfc1034)
(section 3.5)
</pre>

<code>string vmware_engine_network_id = 2 [(.google.api.field_behavior) = REQUIRED];</code>

@return The vmwareEngineNetworkId.
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/CreateVmwareEngineNetworkRequest.java