private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmwareengine.v1.NetworkConfig,
            com.google.cloud.vmwareengine.v1.NetworkConfig.Builder,
            com.google.cloud.vmwareengine.v1.NetworkConfigOrBuilder>
        getNetworkConfigFieldBuilder() {
      if (networkConfigBuilder_ == null) {
        networkConfigBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmwareengine.v1.NetworkConfig,
                com.google.cloud.vmwareengine.v1.NetworkConfig.Builder,
                com.google.cloud.vmwareengine.v1.NetworkConfigOrBuilder>(
                getNetworkConfig(), getParentForChildren(), isClean());
        networkConfig_ = null;
      }
      return networkConfigBuilder_;
    }
<pre>
Required. Network configuration of the private cloud.
</pre>

<code>
.google.cloud.vmwareengine.v1.NetworkConfig network_config = 9 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/PrivateCloud.java