Java学习-多态

结合接口(interface)一起理解：

目录结构如下：

ADAPHero类

1 package charactor;
2 import property.Mortal;
3 public class ADAPHero extends Hero implements Mortal {
4     
5     public  void die()
6     {
7         System.out.println("ADAPHero died");
8     }
9 }

ADHero类

 1 package charactor;
 2 import property.Mortal;
 3 public class ADHero extends Hero implements Mortal
 4 {
 5     public void die()
 6     {
 7         System.out.println("ADHero died");
 8     }
 9 
10 }

APHero类

1 package charactor;
2 import property.Mortal;
3 public class APHero extends Hero implements Mortal{
4     public  void die()
5     {
6         System.out.println("APHero died");
7     }
8 }

Mortal接口类

1 package property;
2 
3 public interface Mortal {
4     public  void die();
5 }

关键的Hero类：

 1 package charactor;
 2 import property.Mortal;
 3 public class Hero {
 4     public String name;
 5     protected float hp;
 6  
 7     public void kill(Mortal m)
 8     {
 9         m.die();
10     }
11  
12     public static void main(String[] args) {
13          
14       Hero h1=new Hero();
15       h1.name="garen";
16       ADHero ad=new ADHero();
17       APHero ap=new APHero();
18       ADAPHero adap=new ADAPHero();
19       h1.kill(ad);　　//传参时：Mortal m = ad,父类接口Mortal的引用m指向子类对象ad，以下同理
20       h1.kill(ap);
21       h1.kill(adap);
22       //同样的Hero类型，同样的kill方法，不同的效果
23     }
24        
25 }

Hero类的主方法运行结果：

ADHero died
APHero died
ADAPHero died