这样为何锁不住，谁知道原理呢？

[宵]

public void run() {

		Object obj = new Object();
		synchronized (obj) {
			while (ticket > 0) {

				System.out.println(Thread.currentThread().getName() + "出售:  票" + ticket);
				m++;
				try {
					Thread.currentThread().sleep(20);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				ticket--;

			}
		}
	}

[meiyoumiss]

把 new object 放到run方法外面就ok了