import java.util.*; import java.util.stream.IntStream; import java.util.stream.DoubleStream; public class Demo { public static void main(String[] args) { IntStream intStream = IntStream.of(5, 20, 25, 45, 60, 75, 85, 90); DoubleStream doubleStream = intStream.mapToDouble(val -> (double) val); doubleStream.forEach(System.out::println); } }