多选题 Given:
2. public class Hug implements Runnable
3. static Thread t1;
4. static Hold h, h2;
5. public void run() {
6. if(Thread.currentThread() .getId() == t1.getId() h.adjust();
7. else h2.view();
8. }
9. public static void main(String[] args) {
10. h = new Hold();
11. h2 = new Hold();
12. t1 = new Thread(new Hug());
13. t1.start();
14. new Thread(new Hug()).start();
15. } }
16. class Hold {
17. static int x = 5;
18. synchronized void adjust() {
19. System.out.print(x-- + " ");
20. try {Thread.sleep(200); } catch (Exception e) { ; }
21. view();
22. }
23. synchronized void view() {
24. try {Thread.sleep(200); } catch (Exception e) { ; }
25. if(x ＞ 0) adjust();
26. } }
Which are true? (Choose all that apply.)