mirror of
https://github.com/dart-lang/sdk
synced 2024-09-18 21:21:18 +00:00
e9255446b3
Change-Id: Ie2f7d2b93120dc2f2fbef6d1c01604d240ecc7da Reviewed-on: https://dart-review.googlesource.com/3420 Reviewed-by: Jennifer Messerly <jmesserly@google.com>
44 lines
1.2 KiB
Dart
44 lines
1.2 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
|
|
// for details. All rights reserved. Use of this source code is governed by a
|
|
// BSD-style license that can be found in the LICENSE file.
|
|
|
|
import "package:expect/expect.dart";
|
|
|
|
abstract class Interface {
|
|
final x;
|
|
Interface(this.x);
|
|
}
|
|
|
|
abstract class Abstract implements Interface {
|
|
String toString() => x.toString();
|
|
}
|
|
|
|
// This class does not implement "x" either, but it is not marked
|
|
// abstract.
|
|
class SubAbstract1 extends Abstract {} //# 01: compile-time error
|
|
|
|
// This class does not implement "x", but is itself abstract, so that's OK.
|
|
abstract class SubAbstract2 extends Abstract {
|
|
get x; // Abstract.
|
|
}
|
|
|
|
// This class does not implement "x" either, but it is not marked
|
|
// abstract.
|
|
class SubSubAbstract2 extends SubAbstract2 {} //# 04: compile-time error
|
|
|
|
class Concrete extends Abstract {
|
|
get x => 7;
|
|
}
|
|
|
|
class SubConcrete extends Concrete {
|
|
final x;
|
|
SubConcrete(this.x);
|
|
}
|
|
|
|
void main() {
|
|
new Abstract(); //# 02: compile-time error
|
|
Expect.equals('7', new Concrete().toString());
|
|
Expect.equals('42', new SubConcrete(42).toString());
|
|
Expect.equals('7', new SubConcrete(new Concrete()).toString());
|
|
}
|