Collectors averagingLong (ToLongFunction mapper)
Description
Collectors averagingLong(ToLongFunction<? super T> mapper)
returns a Collector that produces the arithmetic mean of a long-valued function applied to the elements.
Syntax
averagingLong has the following syntax.
public static <T> Collector<T,?,Double> averagingLong(ToLongFunction<? super T> mapper)
Example
The following example shows how to use averagingLong.
import java.util.stream.Collectors;
import java.util.stream.Stream;
/*from w w w . j a v a 2s. c o m*/
public class Main {
public static void main(String[] args) {
Stream<String> s = Stream.of("1","2","3");
double o = s.collect(Collectors.averagingLong(n->Long.parseLong(n)));
System.out.println(o);
}
}
The code above generates the following result.
