让cons既有具体的用法，又有抽象的用法

class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }
}

const person = new Person('Alice', 30);
console.log(person); // 输出: Person { name: 'Alice', age: 30 }

abstract class Animal {
  protected String name;

  public Animal(String name) {
    this.name = name;
  }

  public abstract void makeSound();
}

class Dog extends Animal {
  public Dog(String name) {
    super(name);
  }

  @Override
  public void makeSound() {
    System.out.println("Woof!");
  }
}

Dog dog = new Dog("Buddy");
dog.makeSound(); // 输出: Woof!

abstract class Animal {
  protected String name;

  public Animal(String name) {
    this.name = name;
  }

  public abstract void makeSound();
}

class Dog extends Animal {
  public Dog(String name) {
    super(name);
  }

  @Override
  public void makeSound() {
    System.out.println("Woof!");
  }
}

Dog dog = new Dog("Buddy"); // 正确的实例化方式

class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }
}

class Employee extends Person {
  constructor(name, age, employeeId) {
    super(name, age); // 确保传递正确的参数
    this.employeeId = employeeId;
  }
}

const employee = new Employee('Bob', 40, 'E12345');
console.log(employee); // 输出: Employee { name: 'Bob', age: 40, employeeId: 'E12345' }