施磊高级 C++项目-集群聊天服务器-软件分层设计和高性能服务开发

StopWatch stopWatch = new StopWatch();    int elementCount = 100000;    stopWatch.start("ArrayList add");    List<Integer> arrayList = IntStream.rangeClosed(1, elementCount).boxed().collect(Collectors.toCollection(ArrayList::new));    // ArrayList插入数据    IntStream.rangeClosed(0, elementCount