多态的运行

 1 public class Duotai {
 2     void eat(){
 3         System.out.println("动物在进食");
 4     }
 5     void roam(){
 6         System.out.println("动物在活动");
 7     }
 8     public static void main(String[] args){
 9         Duotai[] animals = new Duotai[3];
10         animals[0] = new Lions();
11         animals[1] = new Hippo();
12         animals[2] = new Wolf();
13         for(int i = 0;i<animals.length;++i){
14             animals[i].eat();
15             animals[i].roam();
16         }
17     }
18 }
19 class Hippo extends Duotai{
20 }
21 class Wolf extends Duotai{
22 }
23 class Lions extends Duotai{
24 }