In Java 8, there is predefined counting() method returned by Collectors class counting() method to count the number of elements in a Stream.
public static Collector counting() Where, output is a Collector, acting on a Stream of elements of type T, with its finisher returning the ‘collected’ value of type Long. It is a terminal operation which returns the total count of elements in the stream which reach the collect() method after undergoing various pipelined stream operations such as filtering.
Example 1 : To count the elements in stream of Integers.
Example 2 : To count the elements in stream of String.
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