多线程售票

Posted 2020-11-08 wujf

package threadT;

public class ThreadMain {
    public static void main(String args[]) {
        SellTicket str = new SellTicket(10);
        Thread tr1 = new Thread(str, "窗口1");
        Thread tr2 = new Thread(str, "窗口2");
        Thread tr3 = new Thread(str, "窗口3");
        tr1.start();
        tr2.start();
        tr3.start();
    }
}

package threadT;

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

public class SellTicket implements Runnable {

    // 定义票的数量
    private int tickets = 0;

    public SellTicket(int count) {
        tickets = count;
    }

    // 定义锁对象
    private final Lock lock = new ReentrantLock();

    public void run() {
        // 卖完标记
        boolean over = false;
        while (true) {
            try {
                if (tickets == 0) {
                    System.out.println(Thread.currentThread().getName() + "检测到已售完");
                    over = true;
                    break;
                }
                // 加锁
                lock.lock();
                if (tickets > 0) {
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println(Thread.currentThread().getName() + "正在出售第" + (tickets--) + "张票");
                }
            } finally {
                if (!over)
                    // 释放锁
                    lock.unlock();
            }
        }
    }

}