Extending Classes and Inheritance - Beginning Java - page 284

Only a particular Animal object makes a specific sound, so the sound() method in this class does noth-
ing.
First of all, you enhance the class Dog by adding a method to display the sound that a dog makes:

public class Dog extends Animal {
// A barking method
@Override
public void sound() {
System.out.println("Woof Woof");

}

// Rest of the class as before...

}

Directory "AnimalVoices"

You can also derive a class Cat from the class Animal :

public class Cat extends Animal {
public Cat(String aName) {
super("Cat"); // Call the base constructor

name = aName; // Supplied name

breed = "Unknown"; // Default breed value

}

public Cat(String aName, String aBreed) {
super("Cat"); // Call the base constructor

name = aName; // Supplied name

breed = aBreed; // Supplied breed

}

// Return a String full of a cat's details
@Override public String toString() {
return super.toString() + "\nIt's " + name + " the " + breed;

}

// A miaowing method
@Override
public void sound() {
System.out.println("Miiaooww");

}

protected String name; // Name of a cat

protected String breed; // Cat breed