JAVA_多线程_用继承的方式实现多窗口售票并用同步代码块的方式保证线程安全

package threadPage;

//模拟火车站售票窗口，开启三个窗口售票，总数为100张

class Window extends Thread{
static int ticket = 100;
static Object obj = new Object();
public void run() {
while (true) {
synchronized (obj) {
if (ticket > 0) {
System.out.println(Thread.currentThread().getName()+"售票，票号：" + ticket--);
}
}
}
}
}

public class TestWindow {
public static void main(String[] args) {
Window w1 = new Window();
Window w2 = new Window();
Window w3 = new Window();

w1.start();
w2.start();
w3.start();
}
}