code: public void setDBSecurityGroups(java.util.Collection<String> dBSecurityGroups) {
          if (dBSecurityGroups == null) {
              this.dBSecurityGroups = null;
              return;
          }
  
          this.dBSecurityGroups = new java.util.ArrayList<String>(dBSecurityGroups);
      }
docs: <p>
  A list of DB security groups to authorize on this DB instance. Changing this setting doesn't result in an outage
  and the change is asynchronously applied as soon as possible.
  </p>
  <p>
  Constraints:
  </p>
  <ul>
  <li>
  <p>
  If supplied, must match existing DBSecurityGroups.
  </p>
  </li>
  </ul>
  
  @param dBSecurityGroups
  A list of DB security groups to authorize on this DB instance. Changing this setting doesn't result in an
  outage and the change is asynchronously applied as soon as possible.</p>
  <p>
  Constraints:
  </p>
  <ul>
  <li>
  <p>
  If supplied, must match existing DBSecurityGroups.
  </p>
  </li>