Java tutorial
import java.util.OptionalDouble; import java.util.stream.IntStream; public class Main { public static void main(String[] args) { IntStream i = IntStream.of(6, 5, 7, 1, 2, 3, 3); OptionalDouble d = i.average(); if (d.isPresent()) { System.out.println(d.getAsDouble()); } else { System.out.println("no value"); } } }