2、使用抽象类和接口两种方式实现下面的代码 1）、饲养员喂养动物 饲养员在给动物喂食时，给不同的动物喂不同的食物，而且在每次喂食时，动物都会发出欢快的叫声。例如，给小狗喂骨头，小狗会汪汪叫；给小猫喂食，小猫会喵喵叫。 本案例要求编写一个程序模拟饲养员喂食动物的过程，案例要求如下： （1）饲养员给小狗喂骨头，小狗汪汪叫。 （2）饲养员给小猫喂小鱼，小猫喵喵叫。

使用抽象类的实现方式：

abstract class Animal {
    protected String food;
    public abstract void eat();
    public void shout() {
        System.out.println("叫声");
    }
}

class Dog extends Animal {
    public Dog(String food) {
        this.food = food;
    }
    public void eat() {
        System.out.println("给小狗喂食：" + food);
        shout();
    }
    public void shout() {
        System.out.println("小狗汪汪叫");
    }
}

class Cat extends Animal {
    public Cat(String food) {
        this.food = food;
    }
    public void eat() {
        System.out.println("给小猫喂食：" + food);
        shout();
    }
    public void shout() {
        System.out.println("小猫喵喵叫");
    }
}

class Zookeeper {
    public void feed(Animal animal) {
        animal.eat();
    }
}

public class Main {
    public static void main(String[] args) {
        Zookeeper zookeeper = new Zookeeper();

        Animal dog = new Dog("骨头");
        Animal cat = new Cat("小鱼");

        zookeeper.feed(dog); // 饲养员给小狗喂骨头，小狗汪汪叫
        zookeeper.feed(cat); // 饲养员给小猫喂小鱼，小猫喵喵叫
    }
}

使用接口的实现方式：

interface Animal {
    void eat(String food);
    void shout();
}

class Dog implements Animal {
    public void eat(String food) {
        System.out.println("给小狗喂食：" + food);
        shout();
    }
    public void shout() {
        System.out.println("小狗汪汪叫");
    }
}

class Cat implements Animal {
    public void eat(String food) {
        System.out.println("给小猫喂食：" + food);
        shout();
    }
    public void shout() {
        System.out.println("小猫喵喵叫");
    }
}

class Zookeeper {
    public void feed(Animal animal, String food) {
        animal.eat(food);
    }
}

public class Main {
    public static void main(String[] args) {
        Zookeeper zookeeper = new Zookeeper();

        Animal dog = new Dog();
        Animal cat = new Cat();

        zookeeper.feed(dog, "骨头"); // 饲养员给小狗喂骨头，小狗汪汪叫
        zookeeper.feed(cat, "小鱼"); // 饲养员给小猫喂小鱼，小猫喵喵叫
    }
}