java编程 现在有100张火车票，3个卖票窗口同时卖票，直至售空结束。请编写代码模拟此过程。

以下是 Java 代码模拟火车票售卖过程：

public class TrainTicketSale {
    public static void main(String[] args) {
        int totalTickets = 100;
        int ticketsSold = 0;
        Object lock = new Object();

        // 创建三个售票窗口
        TicketSeller seller1 = new TicketSeller("窗口1", lock, totalTickets, ticketsSold);
        TicketSeller seller2 = new TicketSeller("窗口2", lock, totalTickets, ticketsSold);
        TicketSeller seller3 = new TicketSeller("窗口3", lock, totalTickets, ticketsSold);

        // 启动售票窗口线程
        seller1.start();
        seller2.start();
        seller3.start();
    }
}

class TicketSeller extends Thread {
    private String name;
    private Object lock;
    private int totalTickets;
    private int ticketsSold;

    public TicketSeller(String name, Object lock, int totalTickets, int ticketsSold) {
        this.name = name;
        this.lock = lock;
        this.totalTickets = totalTickets;
        this.ticketsSold = ticketsSold;
    }

    @Override
    public void run() {
        while (ticketsSold < totalTickets) {
            synchronized (lock) {
                if (ticketsSold < totalTickets) {
                    System.out.println(name + "售出第" + (++ticketsSold) + "张票");
                }
            }
        }
    }
}

以上代码中，TrainTicketSale 类是程序的入口，它创建了三个 TicketSeller 对象，每个对象代表一个售票窗口。TicketSeller 类继承自 Thread 类，它的 run() 方法模拟了售票过程。在 run() 方法中，每个售票窗口都会不断地尝试售出火车票，直到所有票都售完为止。为了保证线程安全，售票过程中使用了一个共享的锁对象 lock。