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Collectors counting() method in Java 8
The counting() method of the Java 8 Collectors class returns a Collector accepting elements of type T that counts the number of input elements.
The syntax is as follows −
static <T> Collector<T,?,Long> counting()
Here, the parameter −
T − type of input elements
Long − This class value of the primitive type long in an object
To work with Collectors class in Java, import the following package −
import java.util.stream.Collectors;
The following is an example to implement counting() method in Java 8 −
Example
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class Demo {
public static void main(String[] args) {
Stream<String> stream = Stream.of("25", "50", "75", "100", "125", "150", "200");
long res = stream.collect(Collectors.counting());
System.out.println("Count of elements in the stream = "+res);
}
}Output
Count of elements in the stream = 7
Updated on: 30-Jul-2019
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