/**
 * 狗类，继承动物抽象类，实现游泳接口
 */
public class Dog extends Animal implements Swimmable {
    @Override
    public void makeSound() {
        System.out.println("狗叫：汪汪汪！");
    }

    @Override
    public void swim() {
        System.out.println("狗在游泳：狗刨式前进！");
    }
}