code: public ListPlacementsResult withPlacements(PlacementSummary... placements) {
          if (this.placements == null) {
              setPlacements(new java.util.ArrayList<PlacementSummary>(placements.length));
          }
          for (PlacementSummary ele : placements) {
              this.placements.add(ele);
          }
          return this;
      }
docs: <p>
  An object listing the requested placements.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setPlacements(java.util.Collection)} or {@link #withPlacements(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param placements
  An object listing the requested placements.
  @return Returns a reference to this object so that method calls can be chained together.