Collectors counting() example
Description
Collectors counting()
returns a Collector accepting elements of type T
that counts the number of input elements.
Syntax
counting has the following syntax.
public static <T> Collector<T,?,Long> counting()
Example
The following example shows how to use counting.
import java.util.stream.Collectors;
import java.util.stream.Stream;
//from w w w . ja va 2s.co m
public class Main {
public static void main(String[] args) {
Stream<String> s = Stream.of("1","2","3");
long o = s.collect(Collectors.counting());
System.out.println(o);
}
}
The code above generates the following result.
