线程死锁问题

Question

class SellThread implements Runnable
{
int tickets=100;
Object obj=new Object();
boolean bl=true;
public void run()
{
if(bl==true)
{
while(true)
{
sell();
}
}
else
{
while(true)
{

synchronized(obj)
{
try
{
Thread.sleep(10);
}
catch (Exception e)
{
e.toString();
}
synchronized(this)
{
if(tickets>0)
{
System.out.println("Obj "+Thread.currentThread().getName()+
"Tickets:"+tickets);
tickets--;
}
}
}
}
}
}
public synchronized void sell()
{
synchronized(obj)
{
if(tickets>0)
{
try
{
Thread.sleep(10);
}
catch (Exception e)
{
e.printStackTrace();
}
System.out.println("sell<>"+Thread.currentThread().getName()+
"Tickets:"+tickets);
tickets--;
}
}
}
}
class TicketSystem 
{
public static void main(String[] args) 
{
SellThread st=new SellThread();
new Thread(st).start();//执行同步方法sell()
try
{
Thread.sleep(10);
}
catch (Exception e)
{
e.printStackTrace();
}
st.bl=false;
new Thread(st).start();
}
}
为什么结果如下呢？
sell<>Thread-0Tickets:100
sell<>Thread-0Tickets:99
sell<>Thread-0Tickets:98
sell<>Thread-0Tickets:97
sell<>Thread-0Tickets:96

Answer 1

此回复为自动发出,仅用于显示而已，并无任何其他特殊作用
楼主【fwloveyou】截止到2008-08-02 17:19:19的历史汇总数据(不包括此帖)：
发帖的总数量:19                       发帖的总分数:170                      每贴平均分数:8                        
回帖的总数量:6                        得分贴总数量:0                        回帖的得分率:0%                       
结贴的总数量:18                       结贴的总分数:110                      
无满意结贴数:15                       无满意结贴分:410                      
未结的帖子数:1                        未结的总分数:60                       
结贴的百分比:94.74 %               结分的百分比:64.71 %                  
无满意结贴率:83.33 %               无满意结分率:372.73%                  
值得尊敬
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