Java tutorial
import java.util.stream.DoubleStream; import java.util.stream.Stream; public class Main { public static void main(String[] args) { DoubleStream i = DoubleStream.concat(DoubleStream.of(1.0, 2.0, 3.3), DoubleStream.of(4.4, 5.5, 6.6, 7.7)); Stream<Double> o = i.boxed(); o.forEach(System.out::println); } }