多线程方法1，三个窗口卖票

package demo030301;
//多线程练习，创建三个窗口卖票，总票数为100
public class SaleTickets {
    public static void main(String[] args) {
        Windows w1 = new Windows();
        Windows w2 = new Windows();
        Windows w3 = new Windows();

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

class Windows extends Thread{
    private static int sum=100;

    @Override
    public void run() {
        while (true){
            if (sum>0) {
                System.out.println(getName() +"    "+ sum);
//                try {
//                    sleep(100);
//                } catch (InterruptedException e) {
//                    e.printStackTrace();
//                }
                sum--;
            }else {
                break;
            }
        }
    }
}