Java tutorial
import java.util.Arrays; import java.util.List; import java.util.function.Predicate; import java.util.stream.Collectors; import java.util.stream.Stream; public class Main { public static void main(String[] args) { List<String> names = Arrays.asList("Chris", "HTML", "XML", "CSS", ""); Stream<String> s = names.stream(); Predicate<String> isEmpty = String::isEmpty; Predicate<String> notEmpty = isEmpty.negate(); System.out.println(s.filter(notEmpty).collect(Collectors.toList())); } }