Java多线程之同步锁-lock详解

/**
 * Description: 重现窗口售票多线程问题
 *
 * @author xiaoxuzhu
 * @version 1.0
 *
 * <pre>
 * 修改记录:
 * 修改后版本	        修改人		修改日期			修改内容
 * 2022/5/15.1	    xiaoxuzhu		2022/5/15		    Create
 * </pre>
 * @date 2022/5/15
 */
public class LockDemo1 {

    public static void main(String[] args) {
        Ticket ticket = new Ticket();
        new Thread(ticket, "1号窗口").start();
        new Thread(ticket, "2号窗口").start();
        new Thread(ticket, "3号窗口").start();
    }

    static class Ticket implements Runnable {

        private int tick = 100;

        @Override
        public void run() {

            while (true) {
                try {
                    Thread.sleep(200);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                if (tick > 0) {
                    System.out.println(Thread.currentThread().getName() + "完成售票，余票是：" + --tick);
                }
            }
        }
    }
}

public class LockDemo2 {

    public static void main(String[] args) {
        Ticket ticket = new Ticket();
        new Thread(ticket, "1号窗口").start();
        new Thread(ticket, "2号窗口").start();
        new Thread(ticket, "3号窗口").start();
    }

    static class Ticket implements Runnable {

        private int tick = 100;
        //创建锁
        private Lock lock = new ReentrantLock();

        @Override
        public void run() {

            while (true) {
                //上锁
                lock.lock();
                try {
                    try {
                        Thread.sleep(200);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    if (tick > 0) {
                        System.out.println(Thread.currentThread().getName() + "完成售票，余票是：" + --tick);
                    }
                }finally {
                    lock.unlock();
                }
            }
        }
    }
}