JDK5提供的具体锁对象

* JDK5以后提供了更具体的锁定对象，可以获取以及释放，它和synchronized用法一样，提供很多功能
 *    Lock 接口，不能实例化提供了更具体的锁：可重入锁：ReentrantLock
 *    public void lock():获取锁
 *    public void unlock():试图释放该锁

public class LockDemo {
	public static void main(String[] args) {
		//创建一个资源类对象
		SellTicket st=new SellTicket();
		//创建Thread类对象
		Thread t1=new Thread(st,"窗口1");
		Thread t2=new Thread(st,"窗口2");
		Thread t3=new Thread(st,"窗口3");
		//启动线程
		t1.start();
		t2.start();
		t3.start();
	}
}

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class SellTicket implements Runnable {
	//100张票
	private static int tickets=100;
	//创建具体的锁对象
	private Lock lock=new ReentrantLock();
	@Override
	public void run() {
		while(true) {
			try {
				lock.lock();
				if(tickets>0) {
					try {
						Thread.sleep(tickets);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					System.out.println(Thread.currentThread().getName()+" "+(tickets--));
				}
			}finally {
				//释放资源
				lock.unlock();
			}
		}
	}
}