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_0004.sts 19 tags: 20 ---*/ 21 22interface IStudent { 23 name?: string | undefined; 24 age?: int | undefined; 25 desc?: string | undefined; 26 teacher?: Teacher | undefined; 27} 28 29class Teacher { 30 name: string; 31 32 constructor(name: string) { 33 this.name = name; 34 } 35} 36 37class Student implements IStudent { 38 name?: string | undefined; 39 age?: int | undefined; 40 desc?: string | undefined; 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 51function main() : void{ 52 let s0 : Student = new Student("Klara", 18, "an excellent student", new Teacher("Anna")); 53 54 assert s0.name == "Klara" 55 assert s0.age == 18 56 assert s0.desc == "an excellent student" 57 assert s0.teacher?.name == "Anna" 58} 59