1/* 2 * Copyright (c) 2022-2025 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/*--- 17desc: 09.classes/constructor-inheritance 18tags: [] 19---*/ 20 21 class Base { 22 age: int; 23 constructor(param: int = 42) { 24 this.age = param; 25 } 26 } 27 28 class Derive extends Base { 29 constructor(param: int = 42) { 30 super(); 31 } 32 } 33 34 class Derive2 extends Derive { 35 } 36 37 function main(): void { 38 let b = new Derive2(); 39 assertEQ( b.field, 42) 40 41 b = new Derive2(100); 42 assertEQ( b.age, 42) 43 } 44