Multiple Levels of Inheritance

As we indicated at the beginning of the chapter, there is nothing to prevent a derived class being used as a base class. For example, we could derive a class Spaniel from the class Dog without any problem:

Try It Out – A Spaniel Class

Start the Spaniel class off with this minimal code:

class Spaniel extends Dog {
  public Spaniel(String aName) {
    super(aName, "Spaniel");
  }
}

To try this out you can add a Spaniel object to the array theAnimals in the previous example, by changing the statement to:

Animal[] theAnimals = {
                        new Dog("Rover", "Poodle"),
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