code: public void setHeadlines(com.google.api.ads.adwords.axis.v201809.cm.AssetLink[] headlines) {
          this.headlines = headlines;
      }
docs: Sets the headlines value for this ResponsiveSearchAd.
  
  @param headlines   * Headlines. When the Ad serves, the headlines will be selected
  from this list.
  <span class="constraint Selectable">This field
  can be selected using the value "ResponsiveSearchAdHeadlines".</span>
  <span class="constraint Required">This field is required and should
  not be {@code null} when it is contained within {@link Operator}s
  : ADD.</span>