java Lock

package com.java.concurrent;

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 sychronized:隐式锁 1.同步代码块 2.同步方法
 * 
 * jdk1.5以后 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()方法进行释放锁。
 * 
 * @author fliay
 *
 */
public class TestLock {

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

	}

}

class Ticket implements Runnable {

	private int tick = 100;

	private Lock lock = new ReentrantLock();

	public void run() {

		/*
		 * 多个窗口同时售票，会出现一票多卖的情况 while(tick>0){
		 * System.out.println(Thread.currentThread().getName()+"完成售票，余票为："+
		 * --tick); }
		 */

		while (true) {
			lock.lock();
			try {
				Thread.sleep(0);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

			try {
				if (tick > 0) {
					System.out.println(Thread.currentThread().getName() + "完成售票，余票为：" + --tick);
				}
			} finally {
				lock.unlock();
			}
		}

	}

}