关于多list，项目里准入规则，取交集，记录一下

//求多个list交集
public List<String> retainList(List<List<String>> lists) {
    Optional<List<String>> result = lists.parallelStream()
            .filter(list -> list != null && ((List) list).size() != 0)
            .reduce((a, b) -> {
                a.retainAll(b);
                return a;
            });
    return result.orElse(new ArrayList<>());
}