code: public JoinDomainRequest withDomainControllers(String... domainControllers) {
          if (this.domainControllers == null) {
              setDomainControllers(new com.amazonaws.internal.SdkInternalList<String>(domainControllers.length));
          }
          for (String ele : domainControllers) {
              this.domainControllers.add(ele);
          }
          return this;
      }
docs: <p>
  List of IPv4 addresses, NetBIOS names, or host names of your domain server. If you need to specify the port
  number include it after the colon (“:”). For example, <code>mydc.mydomain.com:389</code>.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setDomainControllers(java.util.Collection)} or {@link #withDomainControllers(java.util.Collection)} if
  you want to override the existing values.
  </p>
  
  @param domainControllers
  List of IPv4 addresses, NetBIOS names, or host names of your domain server. If you need to specify the
  port number include it after the colon (“:”). For example, <code>mydc.mydomain.com:389</code>.
  @return Returns a reference to this object so that method calls can be chained together.