售票问题 线程的同步问题-同步方法

 

完整代码： http://yuncode.net/code/c_50434dc5205ae66

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);
        }

    }
}