//List<Map<String,Object>> myList = [{name=qwe, sort=2}, {name=rty, sort=1}, {name=uio, sort=3}]

//第一种
Collections.sort(myList, new Comparator<Map<String, Object>>() {
          @Override
          public int compare(Map<String, Object> o1, Map<String, Object> o2) {
              return o1.get("sort").toString().compareTo(o2.get("sort").toString());
          }
      });


//java8 支持简洁版：
//第二种
myList.sort((o1, o2) -> o1.get("sort").toString().compareTo(o2.get("sort").toString()

//第三种
myList.sort(Comparator.comparing(o -> o.get("sort").toString())