code: public NotificationSpecification withEventTypes(String... eventTypes) {
          if (this.eventTypes == null) {
              setEventTypes(new java.util.ArrayList<String>(eventTypes.length));
          }
          for (String ele : eventTypes) {
              this.eventTypes.add(ele);
          }
          return this;
      }
docs: <p>
  The list of events that should cause notifications to be sent. Valid Values: AssignmentAccepted |
  AssignmentAbandoned | AssignmentReturned | AssignmentSubmitted | AssignmentRejected | AssignmentApproved |
  HITCreated | HITExtended | HITDisposed | HITReviewable | HITExpired | Ping. The Ping event is only valid for the
  SendTestEventNotification operation.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setEventTypes(java.util.Collection)} or {@link #withEventTypes(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param eventTypes
  The list of events that should cause notifications to be sent. Valid Values: AssignmentAccepted |
  AssignmentAbandoned | AssignmentReturned | AssignmentSubmitted | AssignmentRejected | AssignmentApproved |
  HITCreated | HITExtended | HITDisposed | HITReviewable | HITExpired | Ping. The Ping event is only valid
  for the SendTestEventNotification operation.
  @return Returns a reference to this object so that method calls can be chained together.
  @see EventType