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