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