// "Replace with collect" "true" import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.List; import java.util.stream.Collectors; public class Main<T> { public static List<Collection<CharSequence>> test(List<String> list) { List<Collection<CharSequence>> strings = list.stream().<List<CharSequence>>map(Collections::singletonList).collect(Collectors.toList()); return strings; } }