多线程

public class SellTicketDemo implements Runnable{
    Object o = new Object();
    private int ticket=50;
 @Override
 public void run() {
//  synchronized (o) {
//   while(true){
//    try {
//     Thread.sleep(100);
//    } catch (InterruptedException e) {
//     // TODO Auto-generated catch block
//     e.printStackTrace();
//    }
//    if(ticket>0){
//     System.out.println(Thread.currentThread().getName()+"正在出售第"+ticket+"张票");
//         ticket--;
//    }
//   }
//    
//  }错误，直到卖完了才释放监视器的锁
 
   while(true){
    synchronized (o) {
    try {
     Thread.sleep(100);
    } catch (InterruptedException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    if(ticket>0){
     System.out.println(Thread.currentThread().getName()+"正在出售第"+ticket+"张票");
         ticket--;
    }
   }
    
  }
 }
    public static void main(String[] args) {
     SellTicketDemo s = new SellTicketDemo();
  new Thread(s, "1窗口").start();
  new Thread(s, "2窗口").start();
  new Thread(s, "3窗口").start();

 }
}