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1/*
2 * Copyright (c) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16/*---
17 desc: 10.04.Interface_Members
18 name: 10.Interfaces/10.04.Interface_Members/interface_with_optional_attributes_0002.sts
19 tags:
20 ---*/
21
22class Teacher {
23  name: string;
24
25  constructor(name: string) {
26    this.name = name;
27  }
28}
29
30interface IStudent {
31  name: string;
32  age: int;
33  desc: string;
34  teacher?: Teacher | undefined
35}
36
37class Student implements IStudent {
38  name: string;
39  age: int;
40  desc: string;
41  teacher?: Teacher | undefined
42
43  constructor(name: string, age: int, desc: string, teacher: Teacher) {
44    this.name = name;
45    this.age = age;
46    this.desc = desc
47    this.teacher = teacher
48  }
49
50  constructor(name: string, age: int, desc: string) {
51    this.name = name;
52    this.age = age;
53    this.desc = desc
54  }
55}
56
57function main() : void {
58  let s : Student = new Student("Klara", 18, "an excellent student", new Teacher("Anna"));
59  let s1 : Student = new Student("Karl", 18, "a bad student");
60
61  assert s.name == "Klara"
62  assert s.age == 18
63  assert s.desc == "an excellent student"
64  assert s.teacher?.name == "Anna"
65  assert s1.name == "Karl"
66  assert s1.age == 18;
67  assert s1.desc == "a bad student";
68  assert s1.teacher?.name == undefined;
69}
70