Section 17.6.6 Counting the Number of Employees in Each Department
• Collectors static
method groupingBy
with two arguments receives a Function
that classifies the objects in the stream and another Collector
(known as the downstream Collector
; p. 756).
• Collectors static
method counting
returns a Collector
that counts the number of objects in a given classification, rather than collecting them into a List
.
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