关于java8stream的用法

Question

      List<OutFeeListMidDO> list = outFeeListMidDAO.selectList(new QueryWrapper<OutFeeListMidDO>().select("sum( DET_ITEM_FEE_SUMAMT ) as detItemFeeSumamt",
                "sum( PRESELFPAY_AMT ) AS preselfpayAmt", "sum( FULAMT_OWNPAY_AMT ) AS fulamtOwnpayAmt", "MED_CHRGITM_TYPE AS medChrgitmType")
                .eq("vali_flag", "1").eq("mdtrt_id", medicalId).groupBy("MED_CHRGITM_TYPE"));
        String str = "01|02|03|04|05|06|07|08|09|10|11|12|13";
        List<OutFeeListMidDO> mathList = new ArrayList<>();
        OutFeeListMidDO dto = new OutFeeListMidDO();
        dto.setDetItemFeeSumamt(BigDecimal.ZERO);
        dto.setPreselfpayAmt(BigDecimal.ZERO);
        dto.setFulamtOwnpayAmt(BigDecimal.ZERO);
        for (OutFeeListMidDO feeListMidDO : list) {
            if(feeListMidDO.getMedChrgitmType().matches(str)){
                mathList.add(feeListMidDO);
            }else{
                dto.setMedChrgitmType("14");
                dto.setDetItemFeeSumamt(dto.getDetItemFeeSumamt().add(
                        NumberUtil.null2Zero(feeListMidDO.getDetItemFeeSumamt())));
                dto.setPreselfpayAmt(dto.getPreselfpayAmt().add(
                        NumberUtil.null2Zero(feeListMidDO.getPreselfpayAmt())));
                dto.setFulamtOwnpayAmt(dto.getFulamtOwnpayAmt().add(
                        NumberUtil.null2Zero(feeListMidDO.getFulamtOwnpayAmt())));
            }
        }
        mathList.add(dto);
        return mathList;

请问有没有网友，这个for循环用java8的特性一次性处理完？？我们领导说这个三行代码key解决。

Answer 1

望采纳

        List<OutFeeListMidDO> list = outFeeListMidDAO.selectList(new QueryWrapper<OutFeeListMidDO>().select("sum( DET_ITEM_FEE_SUMAMT ) as detItemFeeSumamt",
                "sum( PRESELFPAY_AMT ) AS preselfpayAmt", "sum( FULAMT_OWNPAY_AMT ) AS fulamtOwnpayAmt", "MED_CHRGITM_TYPE AS medChrgitmType")
                .eq("vali_flag", "1").eq("mdtrt_id", medicalId).groupBy("MED_CHRGITM_TYPE"));
        String str = "01|02|03|04|05|06|07|08|09|10|11|12|13";
        Map<Boolean, List<OutFeeListMidDO>> groupMap = list.stream().collect(Collectors.groupingBy(e -> e.getMedChrgitmType().matches(str)));

        List<OutFeeListMidDO> mathList = CollectionUtils.isEmpty(groupMap.get(Boolean.TRUE)) ? new ArrayList<>() : groupMap.get(Boolean.TRUE);
        List<OutFeeListMidDO> falseList = CollectionUtils.isEmpty(groupMap.get(Boolean.FALSE)) ? new ArrayList<>() : groupMap.get(Boolean.FALSE);
        BigDecimal hundred = BigDecimal.TEN.multiply(BigDecimal.TEN);

        OutFeeListMidDO dto = new OutFeeListMidDO();
        dto.setMedChrgitmType("14");
        dto.setDetItemFeeSumamt(new BigDecimal(falseList.stream().map(e -> e.getDetItemFeeSumamt().multiply(hundred)).mapToLong(BigDecimal::longValue).sum()).divide(hundred));
        dto.setPreselfpayAmt(new BigDecimal(falseList.stream().map(e -> e.getPreselfpayAmt().multiply(hundred)).mapToLong(BigDecimal::longValue).sum()).divide(hundred));
        dto.setFulamtOwnpayAmt(new BigDecimal(falseList.stream().map(e -> e.getFulamtOwnpayAmt().multiply(hundred)).mapToLong(BigDecimal::longValue).sum()).divide(hundred));
        mathList.add(dto);