AtomicInteger使用非阻塞算法,实现并发控制多线程实现售票

代码如下:
public class TicketDemo implements Runnable {
    private static volatile AtomicInteger ticketSum = new AtomicInteger(20);
    private static int finalTotal = 0;
 
    @Override
    public void run() {
        int count;
        while ((count = ticketSum.decrementAndGet()) >= 0) {
            System.out.println(Thread.currentThread().getName() + "卖出了第" + ++count + "张票");
            finalTotal++;
        }
    }
 
    public static void main(String[] args) {
        Thread t1 = new Thread(new TicketDemo(), "t1");
        Thread t2 = new Thread(new TicketDemo(), "t2");
        Thread t3 = new Thread(new TicketDemo(), "t3");
        long startTime = System.currentTimeMillis();
        t1.start();
        t2.start();
        t3.start();
        while (true) {
            if (!t1.isAlive() && !t2.isAlive() && !t3.isAlive()) {
                long endTime = System.currentTimeMillis();
                System.out.println("最终售出：" + finalTotal);
                System.out.println("最终耗时：" + (endTime - startTime) + "毫秒.");
                break;
            }
        }
    }
}