// "Replace with collect" "true" import java.util.ArrayList; import java.util.List; import java.util.stream.Collectors; public class Main { public List<Runnable> test(List<String> list) { List<Runnable> result = list.stream().<Runnable>map(s -> () -> { String str = s; if (str.isEmpty()) str = "none"; System.out.println(str); }).collect(Collectors.toList()); return result; } }