Java学习-多态

 

 结合接口(interface)一起理解：

目录结构如下：

 ADAPHero类

package charactor;
import property.Mortal;
public class ADAPHero extends Hero implements Mortal {
    
    public  void die()
    {
        System.out.println("ADAPHero died");
    }
}

ADHero类

package charactor;
import property.Mortal;
public class ADHero extends Hero implements Mortal
{
    public void die()
    {
        System.out.println("ADHero died");
    }

}

APHero类

package charactor;
import property.Mortal;
public class APHero extends Hero implements Mortal{
    public  void die()
    {
        System.out.println("APHero died");
    }
}

Mortal接口类

package property;

public interface Mortal {
    public  void die();
}

关键的Hero类：

package charactor;
import property.Mortal;
public class Hero {
    public String name;
    protected float hp;
 
    public void kill(Mortal m)
    {
        m.die();
    }
 
    public static void main(String[] args) {
         
      Hero h1=new Hero();
      h1.name="garen";
      ADHero ad=new ADHero();
      APHero ap=new APHero();
      ADAPHero adap=new ADAPHero();
      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
      h1.kill(ap);
      h1.kill(adap);
      //同样的Hero类型，同样的kill方法，不同的效果
    }
       
}

Hero类的主方法运行结果：

ADHero died
APHero died
ADAPHero died