多线程- 铁路售票学习

/**
     * 需求:铁路售票,一共100张,通过四个窗口卖完.
     */
    public static void main(String[] args) {
        new Ticket().start();
        new Ticket().start();
        new Ticket().start();
        new Ticket().start();
    }

}

class Ticket extends Thread {
    private static int ticket = 100;
    //private static Object obj = new Object();     //如果用引用数据类型成员变量当作锁对象,必须是静态的
    public void run() {
        while(true) {
            synchronized(Ticket.class) {
                if(ticket <= 0) {
                    break;
                }
                try {
                    Thread.sleep(10);               //线程1睡,线程2睡,线程3睡,线程4睡
                } catch (InterruptedException e) {

                    e.printStackTrace();
                }
                System.out.println(getName() + "...这是第" + ticket-- + "号票");
            }
        }
    }
/**
     * @param args
     * 火车站卖票的例子用实现Runnable接口
     */
    public static void main(String[] args) {
        MyTicket mt = new MyTicket();
        new Thread(mt).start();
        new Thread(mt).start();
        new Thread(mt).start();
        new Thread(mt).start();

        /*Thread t1 = new Thread(mt);               //多次启动一个线程是非法的
        t1.start();
        t1.start();
        t1.start();
        t1.start();*/
    }

}

class MyTicket implements Runnable {
    private int tickets = 100;
    @Override
    public void run() {
        while(true) {
            synchronized(this) {
                if(tickets <= 0) {
                    break;
                }
                try {
                    Thread.sleep(10);               //线程1睡,线程2睡,线程3睡,线程4睡
                } catch (InterruptedException e) {

                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName() + "...这是第" + tickets-- + "号票");
            }
        }
    }
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