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stream 示例

Posted on 2022-1-4, 15:19, by tmser, under . 
//分组，返回mapping
Collectors.groupingBy(AccountPayRecord::getMode, HashMap::new,
                                Collectors.mapping(AccountPayRecord::getTotalFee, Collectors.reducing(new Money(), (d1, d2) -> d1.add(d2)))));


//排序，拼接
installmentIdList.stream().map(id -> installmentMap.get(i...

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标签： java stream
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