售票问题 线程的同步问题-同步代码快

[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) {
			synchronized (this) {
				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);
				}
			}
		}
	}
}