java8 利用 ConcurrentHashMap list根据 某个属性 去重

//自定义方法
private static <T> Predicate<T> distinctByKey(Function<? super T, Object> keyExtractor) {
    Map<Object, Boolean> seen = new ConcurrentHashMap<>();
    return t -> seen.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
}
//使用

List<BindedNote> knowledgeList = page.getResult().stream().filter(distinctByKey(BindedNote::getNoteId)).collect(Collectors.toList());

标签：distinctByKey,ConcurrentHashMap,stream,自定义,list,keyExtractor,seen,java8
来源： https://www.cnblogs.com/wangfl/p/15330440.html