以下是代码：

1. package thread;
   
2. 
   
3. public class Ticket3 implements Runnable
   
4. {
   
5. private int tick=100;
   
6. Object obj=new Object();
   
7. boolean flag=true;
   
8. 
   
9. @Override
   
10. public void run()
    
11. {
    
12. if(flag)
    
13. {
    
14. while(true)
    
15. {
    
16. synchronized(this)
    
17. {
    
18. if(tick>0)
    
19. {
    
20. try {
    
21. Thread.sleep(10);
    
22. } catch (InterruptedException e) {
    
23. }
    
24. }
    
25. System.out.println(Thread.currentThread().getName() + "....code:"+ tick--);
    
26. }
    
27. 
    
28. }
    
29. }
    
30. 
    
31. else
    
32. while(true)
    
33. show();
    
34. }
    
35. public synchronized void show()
    
36. {
    
37. if (tick > 0) {
    
38. try {
    
39. Thread.sleep(10);
    
40. } catch (InterruptedException e) {
    
41. 
    
42. }
    
43. System.out.println(Thread.currentThread().getName() + "....show:"+ tick--);
    
44. }
    
45. }
    
46. }

复制代码

1. package thread;
   
2. 
   
3. public class ThisLockDemo2
   
4. {
   
5. public static void main(String[] args)
   
6. {
   
7. 
   
8. Ticket3 t=new Ticket3();
   
9. 
   
10. Thread t1=new Thread(t);
    
11. Thread t2=new Thread(t);
    
12. 
    
13. 
    
14. t1.start();
    
15. try {
    
16. Thread.sleep(10);
    
17. } catch (InterruptedException e) {
    
18. 
    
19. }
    
20. t.flag=false;
    
21. t2.start();
    
22. 
    
23. 
    
24. 
    
25. }
    
26. 
    
27. }

复制代码

下面是我用MyEclipse打印的结果，竟然出现负数，找了半天不知是哪里出错了,吓人：
Thread-1....show:2
Thread-1....show:1
Thread-0....code:0
Thread-0....code:-1
Thread-0....code:-2

1. package thread;
   
2. 
   
3. public class Ticket3 implements Runnable
   
4. {
   
5. private int tick=100;
   
6. Object obj=new Object();
   
7. boolean flag=true;
   
8. 
   
9. @Override
   
10. public void run()
    
11. {
    
12. if(flag)
    
13. {
    
14. while(true)
    
15. {
    
16. synchronized(this)
    
17. {
    
18. if(tick>0)
    
19. {
    
20. try {
    
21. Thread.sleep(10);
    
22. } catch (InterruptedException e) {
    
23. }
    
24. //[color=Red]}[/color]主要问题在这里，这个括号表示if语句结束了，下面的语句不在if之中，当然无限循环了
    
25. System.out.println(Thread.currentThread().getName() + "....code:"+ tick--);[color=Red]}[/color]}//这里添加就可以了
    
26. 
    
27. }
    
28. }
    
29. 
    
30. else
    
31. while(true){//这里加括号
    
32. show();
    
33. }
    
34. }//这里加个括号，把show方法与if语句分离
    
35. public synchronized void show()
    
36. {
    
37. if (tick > 0) {
    
38. try {
    
39. Thread.sleep(10);
    
40. } catch (InterruptedException e) {
    
41. 
    
42. }
    
43. System.out.println(Thread.currentThread().getName() + "....show:"+ tick--);
    
44. }
    
45. }
    
46. }

复制代码

问题已经解决