通过继承Thread类实现多线程，卖票问题

[java]代码库

//通过继承Thread类实现多线程
//有线程安全问题
class MyThread extends Thread{
	public static int ticket=100;
	
	public void run() {
		while(true) {
			if(ticket>0) {
				try {
					Thread.sleep(100);
				} catch (InterruptedException e) {
					
					e.printStackTrace();
				}
				System.out.println(Thread.currentThread().getName()+":卖票，票号:"+ticket);
				ticket--;
			}else{
				break;
			}
		}
	}
}
public class Main{
	public static void main(String [] args) {
	MyThread mt1=new MyThread();
	MyThread mt2=new MyThread();
	MyThread mt3=new MyThread();
	mt1.setName("窗口1");
	mt2.setName("窗口2");
	mt3.setName("窗口3");
	
	mt1.start();
	mt2.start();
	mt3.start();
	}
}