摘要: JDK1.8:List -> Map: 1,Map<String, String> maps = userList.stream().collect(Collectors.toMap(User::getId, User::getAge, (key1, key2) -> key2)); 2,分组 Ma 阅读全文
posted @ 2019-11-22 19:10 404UnknownCoder 阅读(160) 评论(0) 推荐(0)