package chapter1;

public class Demo3 {
    public static void main(String[] args) {
//        TicketThread ticketThread1 = new TicketThread("售票点1");
//        TicketThread ticketThread2 = new TicketThread("售票点2");
//        TicketThread ticketThread3 = new TicketThread("售票点3");
//        TicketThread ticketThread4 = new TicketThread("售票点4");
//
//        ticketThread1.start();
//        ticketThread2.start();
//        ticketThread3.start();
//        ticketThread4.start();

        TicketRunnable ticketRunnable = new TicketRunnable();
        Thread t1 = new Thread(ticketRunnable,"售票点1");
        Thread t2 = new Thread(ticketRunnable,"售票点2");
        Thread t3 = new Thread(ticketRunnable,"售票点3");
        Thread t4 = new Thread(ticketRunnable,"售票点4");
        
        t1.start();
        t2.start();
        t3.start();
        t4.start();

    }
}

package chapter1;

public class TicketThread extends Thread {
    private static int count = 100;
    private static Object lock = new Object();

    public TicketThread(String name) {
        super(name);
    }

    @Override
    public void run() {
        while (true) {
            synchronized (lock) {
                if (count > 0) {
                    System.out.println(Thread.currentThread().getName() + "卖出了第" + count + "张票。");
                    count--;
                } else {
                    break;
                }
            }
            try {
                Thread.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

package chapter1;

public class TicketRunnable implements Runnable {
    private int count = 100;
    private Object lock = new Object();

    @Override
    public void run() {
        while (true) {
            synchronized (lock) {//第一个线程来的时候会锁上，并且拿走钥匙。当其他线程来了，只能等着。
                if (count > 0) {
                    System.out.println(Thread.currentThread().getName() + "卖出了第" + count + "张票。");
                    count--;
                } else {
                    break;
                }
            }//锁里面的代码执行结束，归还钥匙，其他线程可进。
            try {//休眠之后就没机会跟其他线程抢锁了。
                Thread.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}