package Animal;

public abstract class Animal {
    abstract void makeSound();
}
interface Swimmable{
    void swim();
}
class Dog extends Animal implements Swimmable{
    @Override
    public void makeSound(){
        System.out.println("汪汪汪————");
    }
    @Override
    public void swim(){
        System.out.println("小狗正在游泳...");
    }
}
class Cat extends Animal{
    @Override
    public void makeSound(){
        System.out.println("喵喵喵————");
    }
}