code: public java.util.List<String> getIamUserArns() {
          if (iamUserArns == null) {
              iamUserArns = new com.amazonaws.internal.SdkInternalList<String>();
          }
          return iamUserArns;
      }
docs: <p>
  An array of IAM or federated user ARNs that identify the users to be described.
  </p>
  
  @return An array of IAM or federated user ARNs that identify the users to be described.