多态应用-带宠物看病案例

 1 package com.szxs.pet;
 2 
 3 /**
 4 * 宠物类
 5 */
 6 public abstract class Pet {
 7     private int health;
 8     
 9     public int getHealth() {
10         return health;
11     }
12 
13     public void setHealth(int health) {
14         this.health = health;
15     }
16 
17     public abstract void toHospital();
18 }

 1 package com.szxs.pet;
 2 
 3 /**
 4 * 狗狗类
 5 */
 6 public class Dog extends Pet {
 7     /**
 8      * 狗狗去医院
 9      */
10     public void toHospital() {
11         System.out.println("狗狗看病");
12     }
13 }

 1 package com.szxs.pet;
 2 
 3 /**
 4 * 企鹅类
 5 */
 6 public class Penguin extends Pet {
 7 
 8     /**
 9      * 企鹅去医院
10      */
11     public void toHospital() {
12         System.out.println("企鹅看病");
13     }
14 }

 1 package com.szxs.pet;
 2 
 3 /**
 4 * 主人类
 5 */
 6 public class Master {
 7     /**
 8      * 主人带宠物去看病
 9      * 
10      * @author 
11      *
12      */
13     public void taketoHospital(Pet pet) {
14         pet.toHospital();
15     }
16 }

 1 package com.szxs.pet;
 2 
 3 public class Test {
 4 
 5     public static void main(String[] args) {
 6         Master m=new Master();
 7 
 8         m.taketoHospital(new Dog());
 9         m.taketoHospital(new Penguin());
10             
11         }
12 }