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疑问

Open liyiming-china opened this issue 4 years ago • 1 comments

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

liyiming-china avatar Nov 19 '21 09:11 liyiming-china

Collectors.counting() 改为 Collectors.summingInt(e -> 1))

xiajiafu avatar Jun 13 '23 03:06 xiajiafu