创建一个数组，将其中的元素分别指向Bird、Fish、Cat对象，并通过循环调用eat0方法和play0方法。

好的，以下是创建数组并循环调用方法的示例代码：

public class Animal {
    public void eat0() {
        System.out.println("Animal is eating.");
    }
    public void play0() {
        System.out.println("Animal is playing.");
    }
}
public class Bird extends Animal {
    @Override
    public void eat0() {
        System.out.println("Bird is eating.");
    }
    @Override
    public void play0() {
        System.out.println("Bird is playing.");
    }
}
public class Fish extends Animal {
    @Override
    public void eat0() {
        System.out.println("Fish is eating.");
    }
    @Override
    public void play0() {
        System.out.println("Fish is playing.");
    }
}
public class Cat extends Animal {
    @Override
    public void eat0() {
        System.out.println("Cat is eating.");
    }
    @Override
    public void play0() {
        System.out.println("Cat is playing.");
    }
}

public class Main {
    public static void main(String[] args) {
        Animal[] animals = new Animal[3];
        animals[0] = new Bird();
        animals[1] = new Fish();
        animals[2] = new Cat();

        for (Animal animal : animals) {
            animal.eat0();
            animal.play0();
        }
    }
}

输出结果如下：

Bird is eating.
Bird is playing.
Fish is eating.
Fish is playing.
Cat is eating.
Cat is playing.

需要注意的是，这里使用了 Animal 类作为父类，而 Bird、Fish、Cat 继承自 Animal。在循环中，使用了父类 Animal 的引用，但是运行时会根据实际对象的类型来调用相应的方法。这就是多态的应用。