// 抽象类 Animal
abstract class Animal {
    protected String name;
    
    public Animal(String name) {
        this.name = name;
    }
    
    public abstract void makeSound();
}

// 接口 Swimmable
interface Swimmable {
    void swim();
}

// Dog 类：继承 Animal，实现 Swimmable
class Dog extends Animal implements Swimmable {
    public Dog(String name) {
        super(name);
    }
    
    @Override
    public void makeSound() {
        System.out.println(name + " 汪汪叫");
    }
    
    @Override
    public void swim() {
        System.out.println(name + " 正在游泳 ");
    }
}

// Cat 类：只继承 Animal，不实现 Swimmable
class Cat extends Animal {
    public Cat(String name) {
        super(name);
    }
    
    @Override
    public void makeSound() {
        System.out.println(name + " 喵喵叫");
    }
}

// 测试主类
public class AnimalTest {
    public static void main(String[] args) {
        // 多态测试
        Animal dog = new Dog("旺财");
        Animal cat = new Cat("咪咪");
        
        System.out.println("=== 动物叫声 ===");
        dog.makeSound();
        cat.makeSound();
        
        System.out.println("\n=== 游泳测试 ===");
        // 只有实现 Swimmable 的动物才能游泳
        if (dog instanceof Swimmable) {
            ((Swimmable) dog).swim();
        }
        
        if (cat instanceof Swimmable) {
            ((Swimmable) cat).swim();
        } else {
            System.out.println(cat.name + " 不会游泳 ");
        }
        
        System.out.println("\n=== 集合多态测试 ===");
        // 将所有动物放入数组
        Animal[] animals = {dog, cat};
        for (Animal animal : animals) {
            animal.makeSound();
            // 检查是否会游泳
            if (animal instanceof Swimmable) {
                ((Swimmable) animal).swim();
            }
        }
    }
}