| import java.util.Collections; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.function.Function; |
| import java.util.stream.Collectors; |
| |
| class Test { |
| private static class Thing { |
| final String val; |
| public Thing(String val) { |
| this.val = val; |
| } |
| } |
| |
| public static Optional<List<String>> highlights() { |
| return Optional.of(Collections.singletonList(new Thing("Hello"))) |
| .map(l -> l |
| .stream() |
| .map(t -> t.val + " world!") |
| .collect(Collectors.toList())); |
| } |
| |
| public static Optional<List<String>> works() { |
| return Optional.of(Collections.singletonList(new Thing("Hello"))) |
| .map(l -> l |
| .stream() |
| .map(t -> t.val + " world!") |
| .collect(Collectors.toList())); |
| } |
| } |