在 Java 中如何從超類別存取子類別方法？

Cat cat = new Cat("Feline", 12, "Orange");
cat.getName(); // OK
cat.getColor(); // OK (getColor() is in Cat)

Pet pet = new Cat("Feline", 12, "Orange");
((Cat)pet).getName(); // OK
((Cat)pet).getColor(); // OK (explicitly treated as Cat)

public class Kennel {
    public static void main(String[] args) {
        // Create the pet objects
        Cat cat = new Cat("Feline", 12, "Orange");
        Pet dog = new Dog("Spot", 14, "Dalmatian");
        Pet bird = new Bird("Feathers", 56, 12);

        // Print out the status of the animals
        System.out.println("I have a cat named " + cat.getName()
                + ". He is " + cat.getAge() + " years old."
                + " He is " + cat.getColor()
                + ". When he speaks he says " + cat.speak());

        // Using a cast to access a subclass-specific method
        ((Cat)dog).getBreed(); // dog is treated as Cat to access getBreed()
        System.out.println("I also have a dog named " + dog.getName()
                + ". He is " + dog.getAge() + " years old."
                + " He is a " + ((Cat)dog).getBreed()
                + ". When he speaks he says " + dog.speak());

        System.out.println("And Finally I have a bird named "
                + bird.getName() + ". He is " + bird.getAge() + " years old."
                + " He has a wingspan of " + bird.getWingspan() + " inches."
                + " When he speaks he says " + bird.speak());
    }
}