排序

List<MachineOrderResponse.BackRecord> noSList = ss.stream().sorted(Comparator.comparing(MachineOrderResponse.BackRecord::getTime).reversed()).collect(Collectors.toList());

排序对象集合属性一升序 属性二降序

implicationHolderTableTemplateDtoList.sort(Comparator.comparing(ImplicationHolderTableTemplateDto::getaBDistinguish).thenComparing(ImplicationHolderTableTemplateDto::getAttendCnt, Comparator.reverseOrder()));

List转Map

Map<BigDecimal, String> collect = probabilitiesList.stream().collect(Collectors.toMap(ll -> BigDecimal.valueOf(ll.getADouble()), PlayResponse.Probability::getUuid));

List分组

Map<String, List<MachineOrderResponse.GoodsOrder>> goodMap = leaveList.stream().collect(Collectors.groupingBy(MachineOrderResponse.GoodsOrder::getProduct_id));

求和

int totalGoodsCount = goodsLists.stream().mapToInt(PostageSettingRequest.GoodsList::getGoodsListCount).sum();

提取字符串

String goodsName = orderGoodsList.stream().map(goods -> goods.getGoodsName() + " X " + goods.getOrderGoodsCount()).collect(Collectors.joining(", "));

根据属性去重

mandataryInfoTableList = mandataryInfoTableList.stream().collect(collectingAndThen(toCollection(() -> new TreeSet<>(Comparator.comparing(mandataryInfoTable -> mandataryInfoTable.getCertificateId() + ";" + mandataryInfoTable.getHolderName()))), ArrayList::new));

分组排序

Map<String, List<FuzzyTrialCalculationDto>> groupMap = fuzzyTrialCalculationDtoList.stream().sorted(Comparator.comparingInt(FuzzyTrialCalculationDto::getAlgorithmSort)).collect(Collectors.groupingBy(FuzzyTrialCalculationDto::getAlgorithmName, LinkedHashMap::new, Collectors.toList()));

求和

int totalAge = peopleList.stream().mapToInt(Person::getAge).sum();