OOP: the four pillars, overloading vs overriding · Accenture

class Animal { void sound() { System.out.print("generic "); } }
class Dog extends Animal { void sound() { System.out.print("bark "); } }

public class Main {
    public static void main(String[] args) {
        Animal x = new Dog();
        x.sound();
        Animal y = new Animal();
        y.sound();
    }
}