フィールドは降順で目標時間を設定します

            // java8之前之创建时间降序排序
            Collections.sort(partnerGradeList, new Comparator<PartnerGrade>() {
                @Override
                public int compare(PartnerGrade o1, PartnerGrade o2) {

                    if (o1.getGmtCreate() == null) {
                        if (o2.getGmtCreate() == null) {
                            return 0;
                        } else {
                            return 1;
                        }
                    } else if (o1.getGmtCreate() != null) {
                        if (o2.getGmtCreate() == null) {
                            return -1;
                        } else {
                            if (o1.getGmtCreate().getTime() > o2.getGmtCreate().getTime()) {
                                return -1;
                            }
                            if (o1.getGmtCreate().getTime() == o2.getGmtCreate().getTime()) {
                                return 0;
                            }
                            return 1;
                        }
                    }
                    return 1;

                }
            });
            
 // java8之后之创建时间降序排序
            partnerGradeList = partnerGradeList.stream()
                    .sorted((Comparator.comparing(PartnerGrade::getGmtCreate, Comparator.nullsFirst(Date::compareTo))).reversed())
                    .collect(toList());