Stream mapToDouble (ToDoubleFunction mapper)
Description
Stream mapToDouble(ToDoubleFunction<? super T> mapper) returns
a DoubleStream consisting of the results of applying the given function to the elements of this stream.
Syntax
mapToDouble has the following syntax.
DoubleStream mapToDouble(ToDoubleFunction<? super T> mapper)
Example
The following example shows how to use mapToDouble.
import java.util.Arrays;
import java.util.List;
//from www.j a v a2s.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()
.mapToDouble(n-> Double.parseDouble(n) )
.filter(n-> n%2 == 0)
.forEach(System.out::println);
}
}
The code above generates the following result.
