Stream collect(Collector collector) example
Description
Stream collect(Collector<? super T,A,R> collector) performs a mutable reduction operation on the elements using a Collector.
Syntax
collect has the following syntax.
<R,A> R collect(Collector<? super T,A,R> collector)
Example
The following example shows how to use collect.
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
//from w w w .j a va 2 s . c o m
public class Main {
public static void main(String[] args) {
List<String> stringList = Arrays.asList("2","1","3","4");
long m = stringList
.stream()
.collect(Collectors.counting());
System.out.println(m);
}
}
The code above generates the following result.
