java多线程学习-3

问：如何使用Lock锁方式解决线程安全问题？能给出具体实现代码吗？

》

import java.util.concurrent.locks.ReentrantLock;

/**
 * 解决线程安全问题-2 Lock锁
 *
 * jdk5.0新增
 */
class Window implements Runnable{
    private static int ticket = 100;
    //定义ReentrantLock 对象  ，fair:是否为公平锁，即调用顺序是否需要和start保持一致
    private ReentrantLock lock = new ReentrantLock(true);
    @Override
    public void run() {
        while(true){
            try{
                lock.lock();
                if(ticket>0){
                    try {
                        Thread.sleep(500);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println(Thread.currentThread().getName()+"  "+ticket);
                    ticket--;
                }else{
                    break;
                }
            }finally {
                lock.unlock();
            }

        }
    }
}
public class Test {
    public static void main(String[] args) {
        Window w1 = new Window();
        Thread t1 = new Thread(w1);
        Thread t2 = new Thread(w1);
        Thread t3 = new Thread(w1);

        t1.setName("窗口1");
        t2.setName("窗口2");
        t3.setName("窗口3");
        t1.start();
        t2.start();
        t3.start();
    }
}