chen's blog

实测数据去重好方法 去重方法 public class DataDealWithUtil { public static Predicate distinctByKey(Function<? super T, ?> keyExtractor) { Map<Object, Boolean> seen = new ConcurrentHashMap<>(); return t -> seen.putIfAbsent(keyExtractor.apply(t), Boo

lambda小白总结 常用方法一 根据指定条件过滤（过滤条件可以指定方法进行过滤） List exsits = medicalProjectInfoDao.selectPidListForPids(pids); List updateList = list.parallelStream().filter(o -> exsits.contains(o.getId())).collect(Col...