Collectors summingInt(ToIntFunction mapper) example
Description
Collectors summingInt(ToIntFunction<? super T> mapper)
returns a Collector that produces the sum of a integer-valued
function applied to the input elements.
Syntax
summingInt has the following syntax.
public static <T> Collector<T,?,Integer> summingInt(ToIntFunction<? super T> mapper)
Example
The following example shows how to use summingInt.
import java.util.stream.Collectors;
import java.util.stream.Stream;
//from ww w .jav a 2s.c o m
public class Main {
public static void main(String[] args) {
Stream<String> s = Stream.of("1","2","3");
int o = s.collect(Collectors.summingInt(n->Integer.parseInt(n)));
System.out.println(o);
}
}
The code above generates the following result.
