Stream flatMapToLong(Function mapper) example
Description
Stream flatMapToLong(Function<? super T,? extends LongStream> mapper)
returns an LongStream by replacing each element with a mapped stream produced by applying the provided mapping function.
Syntax
flatMapToLong has the following syntax.
LongStream flatMapToLong(Function<? super T,? extends LongStream> mapper)
Example
The following example shows how to use flatMapToLong.
import java.util.Arrays;
import java.util.List;
import java.util.stream.LongStream;
/* ww w. j av a 2 s.c om*/
public class Main {
public static void main(String[] args) {
List<String> stringList = Arrays.asList("1.2","2.2","3","4","5");
stringList.stream()
.flatMapToLong(n-> LongStream.of(Long.parseLong(n)) )
.forEach(System.out::println);
}
}