@java.lang.Override
  public com.google.protobuf.ByteString getSubnetworkBytes() {
    java.lang.Object ref = subnetwork_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      subnetwork_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
<pre>
Immutable. Name of the Compute Engine subnetwork in which instances
associated with this workstation cluster will be created. Must be part of
the subnetwork specified for this workstation cluster.
</pre>

<code>string subnetwork = 11 [(.google.api.field_behavior) = IMMUTABLE];</code>

@return The bytes for subnetwork.
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/WorkstationCluster.java