Lock接口

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

public class IntegerDemo {
	public static void main(String[] args) {
		// 创建3个线程对象
		SellTicket st = new SellTicket();

		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();
	}
}

class SellTicket implements Runnable {
	private int ticket = 100;
	private Lock lock = new ReentrantLock();

	public void run() {
		while (true) {
			lock.lock();

			if (ticket > 0) {
				try {
					Thread.sleep(100);
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}

				System.out.println(Thread.currentThread().getName() + "正在出售第" + (ticket--) + "张票。");
			}

			lock.unlock();
		}
	}
}