Kế thừa (Inheritance)

🎯 Mục tiêu: OOP với class inheritance.

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💡 extends

class Animal {
  String name;
  Animal(this.name);

  void makeSound() => print("Some sound");
}

class Dog extends Animal {
  Dog(String name) : super(name);

  @override
  void makeSound() => print("Woof!");
}

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📝 super

class Child extends Parent {
  Child() : super();  // Gọi parent constructor

  @override
  void method() {
    super.method();  // Gọi parent method
    // Additional logic
  }
}

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✅ Checklist

• extends để kế thừa
• super để gọi parent
• @override khi override

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