1.定义动物类 属性:年龄行为:喝水,吃东西【吃什么不确定】 2.定义游泳接口: 行为:游泳方法 3.定义狗类 行为:吃饭(啃骨头)和 游泳(狗刨) 4.定义羊类: 行为:吃饭(羊啃草) 5.定义青蛙类: 行为:吃饭(吃虫子)和 游泳(蛙泳) 6.定义饲养员类: 行为:饲养动物:包括吃饭和喝水 7.定义测试类: 创建饲养员对象,饲养员调用三次饲养方法:饲养狗,饲养羊,饲养青蛙

好的，以下是符合您要求的代码：

// 定义动物类
abstract class Animal {
    private int age;
    public Animal(int age) {
        this.age = age;
    }
    public void drinkWater() {
        System.out.println("Animal drinks water.");
    }
    public abstract void eat();
}

// 定义游泳接口
interface Swimable {
    void swim();
}

// 定义狗类
class Dog extends Animal implements Swimable {
    public Dog(int age) {
        super(age);
    }
    public void eat() {
        System.out.println("Dog eats bone.");
    }
    public void swim() {
        System.out.println("Dog swims with dog paddle.");
    }
}

// 定义羊类
class Sheep extends Animal {
    public Sheep(int age) {
        super(age);
    }
    public void eat() {
        System.out.println("Sheep eats grass.");
    }
}

// 定义青蛙类
class Frog extends Animal implements Swimable {
    public Frog(int age) {
        super(age);
    }
    public void eat() {
        System.out.println("Frog eats insects.");
    }
    public void swim() {
        System.out.println("Frog swims with frog kick.");
    }
}

// 定义饲养员类
class Keeper {
    public void feed(Animal animal) {
        animal.drinkWater();
        animal.eat();
    }
}

// 定义测试类
public class Test {
    public static void main(String[] args) {
        Keeper keeper = new Keeper();
        Dog dog = new Dog(2);
        Sheep sheep = new Sheep(3);
        Frog frog = new Frog(1);
        keeper.feed(dog);
        dog.swim();
        keeper.feed(sheep);
        keeper.feed(frog);
        frog.swim();
    }
}

运行结果如下：

Animal drinks water.
Dog eats bone.
Dog swims with dog paddle.
Animal drinks water.
Sheep eats grass.
Animal drinks water.
Frog eats insects.
Frog swims with frog kick.