package com.gf.demo07;

import java.util.concurrent.locks.Lock;

import java.util.concurrent.locks.ReentrantLock;

/**

 * 一、用于解决多线程安全问题的方式:

 * synchronized:隐式锁

 * 1. 同步代码块

 * 2. 同步方法

 *

 * jdk1.5之后：

 * 3. 同步锁Lock

 * 注意：是一个显示锁，需要通过lock() 方法上锁，必须通过unlock() 方法释放锁

 *

 */

public class TestLock {

	public static void main(String[] args) {

		Ticket ticket = new Ticket();

		for (int i = 0; i < 3; i++) {

			new Thread(ticket,i+1+"号窗口").start();

		}

	}

}

class Ticket implements Runnable{

	private int tick = 100;

	//解决方案

	private Lock lock = new ReentrantLock();

	@Override

	public void run() {

		while(true){

			lock.lock(); // 加锁

			try {

				if(0 < tick){

					try {

						Thread.sleep(200);

					} catch (InterruptedException e) {

						e.printStackTrace();

					}

					System.out.println(Thread.currentThread().getName() + " 完成售票，余票为：" + --tick);

				}

			} finally {

				lock.unlock(); //释放锁

			}

		}

	}

}