試題詳解

11. public class PingPong implements Runnable{ 

12. synchronized void hit(long n){

 13. for(int i=1； i＜3； i++) 

14. System.out.print(n + "-" + i + " ")； 

15. }

 16. public static void main(String[] args){

 17. new Thread(new PingPong()).start()；

 18. new Thread(new PingPong()).start()； 

19. }

 20. public void run(){ 

21. hit(Thread.currentThread().getId)；

 22. } 

23. } 

Which two statements are true? (Choose two.)
(A) The output could be 8-1 7-2 8-2 7-1
(B) The output could be 7-1 7-2 8-1 6-1
(C) The output could be 8-1 7-1 7-2 8-2
(D) The output could be 8-1 8-2 7-1 7-2