1 package com.szxs.pet;
 2 /**
 3  * 寵物類
 4  * @author 
 5  *
 6  */
 7 public class Pet {
 8     private String name;  //姓名
 9     private int health;  //健康值
10     private int love;  //親密度
11     
12     public Pet() {
13     }
14     
15     public Pet(String name, int health, int love) {
16         this
 
.name = name;
17         this.health = health;
18         this.love = love;
19     }
20 
21     public String getName() {
22         return name;
23     }
24     public void setName(String name) {
25         this.name = name;
26     }
27     public int getHealth() {
28         return health;
29     }
 
30     public void setHealth(int health) {
31         this.health = health;
32     }
33     public int getLove() {
34         return love;
35     }
36     public void setLove(int love) {
37         this.love = love;
38     }
39     
40 }

 1 package com.szxs.pet;
 2 
 3 public class Penguin extends Pet {
 
 4     
 5     public Penguin() {
 6     }
 7 
 8     public Penguin(String name, int health, int love) {
 9         super(name, health, love);
10     }
11 
12     /**
13      * 企鵝南極遊泳
14      */
15     public void swimming() {
16         System.out.println(this.getName()+"健康值是"+this.getHealth()+"，與主人的親密度是"+this.getLove()+"，特有能力是南極遊泳");
17     }
18 }

 1 package com.szxs.pet;
 2 
 3 public class Dog extends Pet {
 4     
 5     public Dog() {
 6     }
 7 
 8     public Dog(String name, int health, int love) {
 9         super(name, health, love);
10     }
11 
12     /**
13      * 接飛盤
14      */
15     public void getFrisbe() {
16         System.out.println(this.getName()+"健康值是"+this.getHealth()+"，與主人的親密度是"+this.getLove()+"，特有的能力是接飛盤");
17     }
18 }

 1 package com.szxs.pet;
 2 
 3 public class Master {
 4     /**
 5      * 主人和寵物玩
 6      * @author 
 7      *
 8      */
 9     public void  play(Pet pet) {
10         
11         if(pet instanceof Dog) {
12             Dog dog=(Dog)pet;
13             dog.getFrisbe();
14         }else if(pet instanceof Penguin) {
15             Penguin p=(Penguin)pet;
16             p.swimming();
17         }
18     }
19 }

 1 package com.szxs.pet;
 2 
 3 public class Test {
 4 
 5     public static void main(String[] args) {
 6         Master m=new Master();
 7         m.play(new Dog("歐歐",100,30));
 8         m.play(new Penguin("楠楠",100,50));
 9     }
10 
11 }

多態應用-主人與寵物玩耍案例