多线程的小问题 - 黑马程序员技术交流社区

class Ticket implements Runnable
{
private static int tick = 1000;
//Object obj = new Object();
boolean f = true;
public void run()
{
if (f)
{
while(true)
{
synchronized(Ticket.class)
{
if(tick>0)
{
try{Thread.sleep(10);}catch(Exception e){}
System.out.println(Thread.currentThread().getName()+"....sale : "+ tick--);
}
}
}
}
else
while(true)
show();
}
public static synchronized void show()
{
if(tick>0)
{
try{Thread.sleep(10);}catch(Exception e){}
System.out.println(Thread.currentThread().getName()+"....show--- : "+ tick--);
}
}
}
class ThisLockDemo
{
public static void main(String[] args)
{
Ticket t = new Ticket();
Thread t1 = new Thread(t);
Thread t2 = new Thread(t);
t1.start();
try{Thread.sleep(10);}catch(Exception e){}//如果没有这行，t1、t2都会执行show(),那为什么加了这行，不是前10毫秒t1执行同步代码块，之后t1、t2都执行show()呢？
t.f = false;
t2.start();
//t3.start();
//t4.start();
//Thread t3 = new Thread(t);
//Thread t4 = new Thread(t);
}
}

复制代码