JAVA中的多线程(三)

 1 class Ticket implements Runnable//extends Thread
 2 {
 3     private int tick = 100;
 4     Object obj = new Object();
 5     public void run()
 6     {
 7         while(true)
 8         {
 9             synchronized(obj)
10             {
11                 if(tick>0)
12                 {
13                     try{Thread.sleep(10);}catch(Exception e){}
14                     System.out.println(Thread.currentThread().getName()+"sales : "+tick--);
15                 }
16             }
17         }
18     }
19 }
20 class Demo
21 {
22     
23     public static void main(String[] args)
24     {
25         Ticket t = new Ticket();
26         Thread t1 = new Thread(t);
27         Thread t2 = new Thread(t);
28         Thread t3 = new Thread(t);
29         Thread t4 = new Thread(t);
30         t1.start();
31         t2.start();
32         t3.start();
33         t4.start();
34         /*
35         Ticket t1 = new Ticket();
36         Ticket t2 = new Ticket();
37         Ticket t3 = new Ticket();
38         t1.start();
39         t2.start();
40         t3.start();
41         */
42         //System.out.println("");
43     }
44 }