死锁：同步中嵌套同步，但锁不同，示例二：

class DeadLockDemo
{
    public static void main(String[] args)
    {
        Ticket ticket = new Ticket();
        for(int i = 1;i<10;i++)
        {
            new Thread(ticket,"thread--00"+ i +"--").start();
            try
            {
                Thread.sleep(10);
            }
            catch(Exception e)
            {
                System.out.println(e.getMessage());
            }
            ticket.flag = !ticket.flag;
        }
    }
}

class Ticket implements Runnable
{
    private int num = 10000;
    Object object = new Object();
    boolean flag = true;
    
    public void run()
    {
        if(flag)
        {
            while(true)
            {
                synchronized(object)
                {
                    sale();
                }
            }
        }
        else
        {
            while(true)
            {
                sale();
            }
        }        
    }
    
    public synchronized void sale()
    {
        synchronized(object)
        {
            if(num>0)
            {
                try
                {
                    Thread.sleep(10);
                }
                catch(Exception e)
                {
                    
                }
                
                System.out.println(Thread.currentThread().getName()+" .. sale .. "+num--);
            }
        }
    }
}