JZTXT

java陷阱之stram流toMap指针

发布时间 2023-04-21 18:41:03作者: 意犹未尽

当出现key重复 且value有空 则会报控制针异常

userAppOnlineMap = userOnlines.stream().collect(Collectors.toMap(UserOnline::getUserId, AbstractUserOnline::getAppOnline, (c1, c2) -> c1));