Java / OOP / Inheritance - https://www.minte9.com/java/oop-introduction-inheritance-1182

inheritance.java

/**
 * Define Dog class using supertype Animal
 * Use safeguard annotation. 
 */
class App {
    public static void main(String[] args) {
        
        Dog d = new Dog();
        d.test(); // Dog
    }
}
class Animal {
    public void test() {
        System.out.println(
            this.getClass().getSimpleName()
        );
    }
}

/**
 * SOLUTION
 */
class Dog extends Animal {

    @Override
    public void test() {
        super.test();
    }
}