Stream flatMapToDouble(Function mapper) example
Description
Stream flatMapToDouble(Function<? super T,? extends DoubleStream> mapper)
returns an DoubleStream by
replacing each element with the contents of a mapped
stream produced by applying the mapping function.
Syntax
flatMapToDouble has the following syntax.
DoubleStream flatMapToDouble(Function<? super T,? extends DoubleStream> mapper)
Example
The following example shows how to use flatMapToDouble.
import java.util.Arrays;
import java.util.List;
import java.util.stream.DoubleStream;
//w w w . j a v a 2 s . c o m
public class Main {
public static void main(String[] args) {
List<String> stringList = Arrays.asList("1.2","2.2","3","4","5");
stringList.stream()
.flatMapToDouble(n-> DoubleStream.of(Double.parseDouble(n)) )
.forEach(System.out::println);
}
}
The code above generates the following result.
