Java8对List和Map的一些操作

List> r = Lists.newArrayList();
//正序
r.stream().sorted(Comparator.comparing(m -> m.get("sort").toString())).collect(Collectors.toList());
//倒序
r.stream().sorted(Comparator.comparing((Map m) -> m.get("sort").toString()).reversed()).collect(Collectors.toList());

List> r = Lists.newArrayList();
Map>> data = r.stream().collect(Collectors.groupingBy(m -> m.get("type").toString()));