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2022-06

发表于 阅读次数： Valine：
本文字数： 696 阅读时长 ≈ 1 分钟

stream 流实现分页

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// 分页例子
void pageByStream(List<Object> codeList) {
        int pageSize = 20;
        int totalCount = codeList.size();
        int totalPage = totalCount % pageSize == 0 ? totalCount / pageSize : totalCount / pageSize + 1;

        for (long i = 0; i < totalPage; i++) {
            List<Object> pageCodeList = codeList.stream().skip(i * pageSize).limit(pageSize).collect(Collectors.toList());
        }
    }

toMap

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Map<Long, ContractDetail> contractDetailMap = contractDetailList.stream().collect(Collectors.toMap(ContractDetail::getContractId, Function.identity(), (v1, v2) -> v1));

groupBy

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Map<Long, List<QueryPeopleReturnVo>> peopleVoMap = peopleReturnVos.stream().collect(Collectors.groupingBy(QueryPeopleReturnVo::getCustomerCode));