public java.util.List<String> getUserIds() {
        if (userIds == null) {
            userIds = new com.amazonaws.internal.SdkInternalList<String>();
        }
        return userIds;
    }
<p>
The list of user IDs that belong to the user group.
</p>

@return The list of user IDs that belong to the user group.
aws-java-sdk-elasticache/src/main/java/com/amazonaws/services/elasticache/model/ModifyUserGroupResult.java