多态的使用----自行编写维护list以保存对象

public class duotai  {    public static void main(String [] args)    {        Cat c = new Cat();        Dog d = new Dog();        MyAnimalList List = new MyAnimalList ();        List.add(c);        List.add(d);    }}

public class MyAnimalList {    private Animal[] animals= new Animal[5];    private int i = 0;    public void add(Animal a){        if(i<animals.length){            animals[i]=a;            System.out.println("at"+i);            i++;        }    }}