public void setGatewayList(java.util.Collection<GatewayListItem> gatewayList) {
        if (gatewayList == null) {
            this.gatewayList = null;
            return;
        }

        this.gatewayList = new java.util.ArrayList<GatewayListItem>(gatewayList);
    }
<p>
The list of gateways that you want to use for sending the downlink data traffic.
</p>

@param gatewayList
       The list of gateways that you want to use for sending the downlink data traffic.
aws-java-sdk-iotwireless/src/main/java/com/amazonaws/services/iotwireless/model/ParticipatingGateways.java