Inheritance in Dart

Inheritance is a fundamental concept in object-oriented programming (OOP) that allows one class to inherit properties and methods from another class. In Dart, the extends keyword is used to achieve inheritance.

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Inheritance in Dart

Basic Inheritance

A child class can inherit properties and methods from a parent class using extends.

class Animal {
  void makeSound() {
    print("Animal makes a sound");
  }
}

class Dog extends Animal {
  void bark() {
    print("Dog barks");
  }
}

void main() {
  var dog = Dog();
  dog.makeSound(); // Inherited method
  dog.bark();      // Dog-specific method
}

Overriding Methods

A subclass can override a parent class method using the @override annotation.

class Animal {
  void makeSound() {
    print("Animal makes a sound");
  }
}

class Cat extends Animal {
  @override
  void makeSound() {
    print("Cat meows");
  }
}

void main() {
  var cat = Cat();
  cat.makeSound(); // Output: Cat meows
}