stream場景用法總結

Map taskNoTaskMap = taskList.stream().collect(HashMap::new, (m,v)->m.put(v.getTaskNo(), v),HashMap::putAll);

Map<String, Integer> taskNoPickedMap = order.getSkuList()
                    .stream()
                    .collect(
                            Collectors.groupingBy(WcsPickTaskReqDto.Body.Order.Sku::getRemark,
                            Collectors.summingInt(WcsPickTaskReqDto.Body.Order.Sku::getPickupAmount))
                    );

Set<Long> allLackObdOrderSysNoSet = obdOrderLineList
                .stream()
                .collect(
                        Collectors.groupingBy(
                                ObdOrderLine::getOrderSysNo,
                                Collectors.collectingAndThen(
                                        Collectors.toSet(),
                                        list -> list.stream().allMatch(ol -> ol.getQtyPicked().equals(0))
                                )
                        )
                )
                .entrySet()
                .stream()
                .filter(m -> m.getValue())
                .collect(Collectors.toMap(m -> m.getKey(), m -> m.getValue()))
                .keySet();