JAVA中多线程的锁

接 https://blog.youkuaiyun.com/godkzz/article/details/119390742?spm=1001.2014.3001.5501

线程安全问题除了同步代码块，还可以用锁解决

1.创建ReentrantLock对象

2.在需要同步块前加上方法 lock() 加锁

3.在需要同步块后加上方法 unlock() 释放锁

public class RunnableImpl implements Runnable {
    private int ticket = 100;
    ReentrantLock mylock = new ReentrantLock();//创建一个ReentrantLock对象
    @Override
    public void run() {
        while (true) {
            mylock.lock();//加锁
            if (this.ticket > 0) {
                System.out.println(Thread.currentThread().getName() + "正在卖第" + ticket-- + "张票");
            } else {
                break;
            }
            mylock.unlock();//释放锁

        }
    }
}