public class AnimalTest {
    public static void main(String[] args) {
        // 创建动物数组，演示多态
        Animal[] animals = new Animal[2];
        animals[0] = new Dog();
        animals[1] = new Cat();
        
        // 测试多态调用makeSound方法
        System.out.println("测试动物叫声：");
        for (Animal animal : animals) {
            animal.makeSound();
        }
        
        // 测试Dog的swim方法
        System.out.println("\n测试游泳能力：");
        if (animals[0] instanceof Swimmable) {
            ((Swimmable) animals[0]).swim();
        }
        
        if (animals[1] instanceof Swimmable) {
            ((Swimmable) animals[1]).swim();
        } else {
            System.out.println("猫不会游泳！");
        }
    }
}