/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

let instance;
class A {
  name = ''
  getName() {
    return this.name;
  }
  setName(name) {
    this.name = name;
  }
}

class B extends A {
  constructor (...args) {
    if (!instance) {
      instance = super(...args);
    }
    return instance;
  }
}

let a = new B();
let b = new B();

a.setName('aaa');
print(b.getName());