售票问题 线程的同步问题-同步方法

[java]代码库

public class Test {
	public static void main(String[] args) {
		TestThread t = new TestThread();

		// 7个售票窗口
		new Thread(t).start();
		new Thread(t).start();
		new Thread(t).start();
		new Thread(t).start();
		new Thread(t).start();
		new Thread(t).start();
		new Thread(t).start();
	}
}

class TestThread implements Runnable {
	private int tickets = 20;

	public void run() {
		while (true) {
			sale();
		}
	}

	public synchronized void sale() {

		if (tickets > 0) {
			try {
				Thread.sleep(100);
			} catch (Exception e) {
			}
			System.out.println(Thread.currentThread().getName() + "售票， 余票"
					+ --tickets);
		} else {
			System.out.println("票已售完...");
			System.exit(0);
		}

	}
}