public class Animal {
    // Campos
    protected String name;
    protected int age;

    // Constructor
    public Animal(String name, int age) {
        this.name = name;
        this.age = age;
    }

    // Método
    public void makeSound() {
        System.out.println("Some generic animal sound");
    }
}

public class Dog extends Animal {
    // Campo adicional
    private String breed;

    // Constructor
    public Dog(String name, int age, String breed) {
        super(name, age); // Llamada al constructor de la superclase
        this.breed = breed;
    }

    // Método adicional
    public void fetch() {
        System.out.println(name + " is fetching the ball!");
    }

    // Sobrescritura de método
    @Override
    public void makeSound() {
        System.out.println("Bark");
    }
}

public class Main {
    public static void main(String[] args) {
        Dog myDog = new Dog("Buddy", 3, "Golden Retriever");
        myDog.makeSound(); // Salida: Bark
        myDog.fetch(); // Salida: Buddy is fetching the ball!
    }
}

public class Vehicle {
    protected String make;
    protected String model;
    protected int year;

    public Vehicle(String make, String model, int year) {
        this.make = make;
        this.model = model;
        this.year = year;
    }

    public void startEngine() {
        System.out.println("Engine started");
    }
}

public class Car extends Vehicle {
    private int numberOfDoors;

    public Car(String make, String model, int year, int numberOfDoors) {
        super(make, model, year);
        this.numberOfDoors = numberOfDoors;
    }

    public void honk() {
        System.out.println("Honk! Honk!");
    }
}

public class Main {
    public static void main(String[] args) {
        Car myCar = new Car("Toyota", "Corolla", 2020, 4);
        myCar.startEngine(); // Salida: Engine started
        myCar.honk(); // Salida: Honk! Honk!
    }
}