docs: public void setGatewayNetworkInterfaces(java.util.Collection<NetworkInterface> gatewayNetworkInterfaces) {
          if (gatewayNetworkInterfaces == null) {
              this.gatewayNetworkInterfaces = null;
              return;
          }
  
          this.gatewayNetworkInterfaces = new com.amazonaws.internal.SdkInternalList<NetworkInterface>(gatewayNetworkInterfaces);
      }