JAVA学習--インタフェースの使い方2(インタフェース間の多態性)

 1 // 

 2 public class TestInterface {

 3     

 4     public static void main(String[] args) {

 5         Duck d = new Duck();

 6         TestInterface.test1(d);

 7         TestInterface.test2(d);

 8         TestInterface.test3(d);

 9     }

10     

11     public static void test1(Runner r){//Runner r = new Duck();

12         r.run();// 

13     }

14     public static void test2(Swimmer s){//Swimmer s = new Duck();

15         s.swim();

16     }

17     public static void test3(Flier f){//Flier f = new Duck();

18         f.fly();

19     }

20 }

21 

22 interface Runner{

23     public abstract void run();

24 }

25 interface Swimmer{

26     void swim();

27 }

28 interface Flier{

29     void fly();

30 }

31 

32 class Duck implements Runner,Swimmer,Flier{

33 

34     @Override

35     public void fly() {

36         System.out.println(" ！");

37     }

38 

39     @Override

40     public void swim() {

41         System.out.println(" ");

42     }

43 

44     @Override

45     public void run() {

46         System.out.println(" ");

47     }

48     

49 }