What language constructs allow implementing class inheritance mechanisms?

In Java, inheritance is implemented using the extends keyword for classes and implements for interfaces. A class can inherit from another class, extending its functionality.

Example:

class Animal {
    void sound() {
        System.out.println("Some sound");
    }
}

class Dog extends Animal {
    @Override
    void sound() {
        System.out.println("Bark");
    }
}

public class Main {
    public static void main(String[] args) {
        Dog dog = new Dog();
        dog.sound(); // Outputs: Bark
    }
}