java同步问题

Question

[code="java"]
class Ticket implements Runnable
{
private int tick = 1000;
Object obj = new Object();
public void run()
{
while(true)
{
synchronized(obj)
{
if(tick>0)
{
try{Thread.sleep(10);}catch(Exception e){}
System.out.println(Thread.currentThread().getName()+"....sale : "+ tick--);
}
}
}
}
}

class TicketDemo2
{
public static void main(String[] args)
{

    Ticket t = new Ticket();

    Thread t1 = new Thread(t);
    Thread t2 = new Thread(t);
    Thread t3 = new Thread(t);
    Thread t4 = new Thread(t);
    t1.start();
    t2.start();
    t3.start();
    t4.start();


}

}[/code]

我想问的是t1进入Thread.sleep的时候,其它线程会不会进入同步代码块

Answer 1

不会的，sleep并不释放锁，如果是wait就会释放该线程占用的锁。