java 对象集合排序再排序后顺序去重(只取最前面的唯一)

    
    private List listSort(List effectiveCoupon) {
        List newList = effectiveCoupon.stream().sorted(Comparator
                .comparing(CouponStatusInfo::getEndTime)
                .thenComparing(CouponStatusInfo::getStartTime, Comparator.reverseOrder())
        ).filter(distinctByKey(item->item.getActivityId())).collect(Collectors.toList());
        log.debug("---listSort.newList: {}", newList);
        return newList;
    }

    private static  Predicate distinctByKey(Function keyExtractor) {
        Set