public class Dog extends Animal {
  // java requires an explicit constructor when the supertype awaits parameters in the constructor
  public Dog(String name) {
    // call supertype constructor
    super(name);
  }

  // override the method make_sound
  public void make_sound() {
    // implement own functionality
    System.out.println("doggo " + this.name + " says:");
    System.out.println("woof!");
  }
}