三个售票员卖票（Lock）

三个售票员并发卖票

//锁    操作    资源
class Tickect {
    private int m = 30;
    private Lock lock = new ReentrantLock();

    public void buy() {
        lock.lock();
        try {
            if (m > 0) {
                System.out.println(Thread.currentThread().getName() + "第：" + (m--) + "张票被卖出");
            }
        } finally {
            lock.unlock();
        }

    }
}


public class CurrentLock {
    public static void main(String[] args) {
        Tickect tickect = new Tickect();
        new Thread(() -> {
            for (int i = 0; i < 30; i++) tickect.buy();
        }, "A").start();
        new Thread(() -> {
            for (int i = 0; i < 30; i++) tickect.buy();
        }, "B").start();
        new Thread(() -> {
            for (int i = 0; i < 30; i++) tickect.buy();
        }, "C").start();
    }
}