stream 过滤集合，按照行号排序，取mun最大值的数据

Map<String, IWLS_EnDepotEntry> collect = endepot.stream().collect(
                Collectors.groupingBy(IWLS_EnDepotEntry::getPurBCode,
                        Collectors.collectingAndThen(Collectors.reducing((c1, c2) -> c1.getNum().intValue() > c2.getNum().intValue() ? c1 : c2),
                                Optional::get)));
        endepot = new ArrayList<>(collect.values());

        Map<String, IWLS_EnDepotEntry> collect1 = enDepotEntryList.stream().collect(
                Collectors.groupingBy(IWLS_EnDepotEntry::getPurBCode,
                        Collectors.collectingAndThen(Collectors.reducing((c1, c2) -> c1.getNum().intValue() > c2.getNum().intValue() ? c1 : c2),
                                Optional::get)));
        enDepotEntryList = new ArrayList<>(collect1.values());

先转换成流 ，接着使用  Collectors.groupingBy 进行分组，Collectors.collectingAndThen 分组后继续处理。