Given: 11. class PingPong2 { 12. synchronized void hit(long n) { 13. for(int i = 1; i < 3; i++) 14. System.out.print(n + "-" + i + " "); 15. } 16. } 17. public class Tester implements Runnable { 18. static PingPong2 pp2 = new PingPong2(); 19. public static void main(String[] args) { 20. new Thread(new Tester()).start(); 21. new Thread(new Tester()).start(); 22. } 23. public void run() { pp2.hit(Thread.currentThread().getId()); } 24. } Which statement is true? A. The output could be 5-1 6-1 6-2 5-2 B. The output could be 6-1 6-2 5-1 5-2 C. The output could be 6-1 5-2 6-2 5-1 D. The output could be 6-1 6-2 5-1 7-1

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Question :
Given:
11. class PingPong2 {
12. synchronized void hit(long n) {
13. for(int i = 1; i < 3; i++)
14. System.out.print(n + "-" + i + " ");
15. }
16. }
17. public class Tester implements Runnable {
18. static PingPong2 pp2 = new PingPong2();
19. public static void main(String[] args) {
20. new Thread(new Tester()).start();
21. new Thread(new Tester()).start();
22. }
23. public void run() { pp2.hit(Thread.currentThread().getId()); }
24. }
Which statement is true?
A. The output could be 5-1 6-1 6-2 5-2
B. The output could be 6-1 6-2 5-1 5-2
C. The output could be 6-1 5-2 6-2 5-1
D. The output could be 6-1 6-2 5-1 7-1

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Answers:

B:The output could be 6-1 6-2 5-1 5-2

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