code: public DescribeEventDetailsResult withSuccessfulSet(EventDetails... successfulSet) {
          if (this.successfulSet == null) {
              setSuccessfulSet(new java.util.ArrayList<EventDetails>(successfulSet.length));
          }
          for (EventDetails ele : successfulSet) {
              this.successfulSet.add(ele);
          }
          return this;
      }
docs: <p>
  Information about the events that could be retrieved.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setSuccessfulSet(java.util.Collection)} or {@link #withSuccessfulSet(java.util.Collection)} if you want
  to override the existing values.
  </p>
  
  @param successfulSet
  Information about the events that could be retrieved.
  @return Returns a reference to this object so that method calls can be chained together.