// Dog类，继承Animal抽象类并实现Swimmable接口
public class Dog extends Animal implements Swimmable {
    // 重写makeSound方法，实现狗的叫声
    @Override
    public void makeSound() {
        System.out.println("Dog barks: Woof! Woof!");
    }
    
    // 实现swim方法，定义狗的游泳行为
    @Override
    public void swim() {
        System.out.println("Dog is swimming");
    }
}