code: public DescribeScalingActivitiesResult withScalingActivities(ScalingActivity... scalingActivities) {
          if (this.scalingActivities == null) {
              setScalingActivities(new java.util.ArrayList<ScalingActivity>(scalingActivities.length));
          }
          for (ScalingActivity ele : scalingActivities) {
              this.scalingActivities.add(ele);
          }
          return this;
      }
docs: <p>
  A list of scaling activity objects.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setScalingActivities(java.util.Collection)} or {@link #withScalingActivities(java.util.Collection)} if
  you want to override the existing values.
  </p>
  
  @param scalingActivities
  A list of scaling activity objects.
  @return Returns a reference to this object so that method calls can be chained together.