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목록ava stream 으로 sum 구하기 (1)
Small Asteroid Blog
[java] java stream 으로 합계(sum) 구하기
Integer memberId = 1; TotalDto dto = TotalDto.builder() .contribution1(contributionDto.stream().mapToLong(ContributionDto::getTotalAmount).sum()) .contribution2(contributionDto.stream().filter(x -> x.getId().equals(memberId)).mapToLong(ContributionDto::getTotalAmount).sum()) .build();
백엔드/Java
2023. 1. 12. 09:21