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Java 8 Streams - Collectors.counting Examples

Java 8 Streams Java Java API

Class:

java.util.stream.Collectors

Method:


public static <T> Collector<T,?,Long> counting()

Returns a Collector accepting elements of type T that counts the number of input elements. If no elements are present, the result is 0.

Examples

The method Collectors#counting collects the counts of the stream elements.

package com.logicbig.example.collectors;

import java.util.stream.Collectors;
import java.util.stream.Stream;

public class CountingExample {
    public static void main (String[] args) {
        Stream<String> s = Stream.of("apple", "banana", "orange");
        Long c = s.collect(Collectors.counting());
        System.out.println(c);
    }
}

Output

See Also