code: public java.util.List<NetworkInterface> getGatewayNetworkInterfaces() {
          if (gatewayNetworkInterfaces == null) {
              gatewayNetworkInterfaces = new com.amazonaws.internal.SdkInternalList<NetworkInterface>();
          }
          return gatewayNetworkInterfaces;
      }
docs: <p>
  A <a>NetworkInterface</a> array that contains descriptions of the gateway network interfaces.
  </p>
  
  @return A <a>NetworkInterface</a> array that contains descriptions of the gateway network interfaces.