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疑问 #16

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liyiming-china opened this issue Nov 19, 2021 · 1 comment
Open

疑问 #16

liyiming-china opened this issue Nov 19, 2021 · 1 comment

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@liyiming-china
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Map<Department, Integer> totalByDept = employees.stream()
.collect(Collectors.groupingBy(Employee::getDepartment,
Collectors.counting()));// 下游收集器
Collectors.counting()怎么返回Integer
@xiajiafu
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xiajiafu commented Jun 13, 2023 •
edited
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Collectors.counting() 改为 Collectors.summingInt(e -> 1))

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@xiajiafu @liyiming-china