code: public void setListType(com.google.api.ads.adwords.axis.v201809.rm.UserListType listType) {
          this.listType = listType;
      }
docs: Sets the listType value for this UserList.
  
  @param listType   * Type of this list: remarketing/logical/external remarketing.
  <span class="constraint Selectable">This field can be selected using
  the value "ListType".</span><span class="constraint Filterable">This
  field can be filtered on.</span>
  <span class="constraint ReadOnly">This field is read
  only and will be ignored when sent to the API.</span>