Stream mapToLong(ToLongFunction mapper) example
Description
Stream mapToLong(ToLongFunction<? super T> mapper) returns a LongStream by applying the function to the stream.
Syntax
mapToLong has the following syntax.
LongStream mapToLong(ToLongFunction<? super T> mapper)
Example
The following example shows how to use mapToLong.
import java.util.Arrays;
import java.util.List;
//from ww w.ja va2 s . c o m
public class Main {
public static void main(String[] args) {
List<String> stringList = Arrays.asList("1","2","3","4","5");
stringList.stream()
.mapToLong(n-> Long.parseLong(n) )
.filter(n-> n%2 == 0)
.forEach(System.out::println);
}
}
The code above generates the following result.
