java 多态测试（abstract）
public class demo {
public static void main(String args[])
{
Animal wang=new Dog();
wang.eat();
}
}
abstract class Animal{
boolean hunger;
String location;
abstract void eat();
}
class MyAnimalList{
private Animal[] animals=new Animal [5];//用来存对象的数组
private int nextIndex=0;
public void add(Animal a){
if(nextIndex<animals.length)
animals[nextIndex]=a;
System.out.print("Animal add at"+nextIndex);
nextIndex++;
}
}
