1/* 2 * Copyright (c) 2024-2025 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 interface Interface { 17 instance_field: number 18} 19 20abstract class Abstract { 21 private _instance_field: number = -1 22 23 get instance_field(): number{ 24 return this._instance_field; 25 } 26 27 set instance_field(v: number) { 28 this._instance_field = v; 29 } 30} 31 32class Base extends Abstract { 33} 34 35class Derived extends Base implements Interface { 36 instance_field: number = -1 37 38 public method(): number { 39 this.instance_field -= 1 40 super.instance_field += 1 41 return super.instance_field 42 } 43} 44 45function main() { 46 let d = new Derived 47 assertEQ(d.method(), 0 ) 48 assertEQ(d.instance_field, -2) 49} 50