Lock实现更广泛的锁操作

1.Lock概述

synchronized关键字的上锁和解锁都是自动完成，在JUC中可以使用Lock接口实现手动上锁解锁，并且可以更加精准的控制等待唤醒

2.ReentrantLock

public class TestLock {
    public static void main(String[] args) {
        TicketTask ticketTask = new TicketTask();
        for (int i = 0; i < 10; i++) {
            new Thread(ticketTask, "线程" + i).start();
        }
    }
}


class TicketTask implements Runnable {

    private int number = 500;
    private Lock lock = new ReentrantLock();

    @Override
    public void run() {

        while (true) {
            lock.lock();
            try {
                if (number > 0) {
                    try {
                        Thread.sleep(10);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    number--;
                    System.out.println(Thread.currentThread().getName() + "完成售票：" + number);
                } else {
                    break;
                }
            } finally {
                lock.unlock();
            }

        }

    }
}

3.ReentrantReadWriteLock