利用Java中的线程模拟一个火车票功能

package lesson;
public class Demo1 {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Train tt = new Train();
		Thread t1 = new Thread(tt);
		Thread t2 = new Thread(tt);
		Thread t3 = new Thread(tt);
		Thread t4 = new Thread(tt);
		t1.setName("窗口1");
		t2.setName("窗口2");
		t3.setName("窗口3");
		t4.setName("窗口4");
		t1.start();
		t2.start();
		t3.start();
		t4.start();
	}
}
class Train implements Runnable{
	int a= 1;
	@Override
	public synchronized void run() {//synchronized为进程上锁
		// TODO Auto-generated method stub
		while(true) {
			if(a<=100) {
		System.out.println(Thread.currentThread().getName()+"卖出"+a+"号票");
				a++;
			}
			try {
				this.wait(230);
//				Thread.sleep(100);//结果输出只有窗口1卖了所有票如图2所示
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
}