code: public void setTopics(java.util.Collection<Topic> topics) {
          if (topics == null) {
              this.topics = null;
              return;
          }
  
          this.topics = new com.amazonaws.internal.SdkInternalList<Topic>(topics);
      }
docs: <p>
  A list of topic ARNs.
  </p>
  
  @param topics
  A list of topic ARNs.