java8根据某个属性去重

public 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;
}

list.stream().filter(distinctByKey(AiCategorySelectVo::getId)).collect(Collectors.toList());