with <? super SortOf> in mathod argument, you can add SortOf object only or Null ,not supertypes od SortOf list.add(new SortOf(..)) as there can be many supertypes..of SortOf. and yaa ofcourse ,we will get /return only Object.
This one time, at bandcamp, I had relations with a tiny ad.
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop