public void setUserIds(java.util.Collection<String> userIds) {
        if (userIds == null) {
            this.userIds = null;
            return;
        }

        this.userIds = new java.util.ArrayList<String>(userIds);
    }
<p>
A list of user IDs.
</p>

@param userIds
       A list of user IDs.
aws-java-sdk-connect/src/main/java/com/amazonaws/services/connect/model/NotificationRecipientType.java