买票问题-线程的同步

//买票问题
package ThreadL;

public class Thread9 {
    public static void main(String[] args){
        Thread th1 = new Thread(new Thread9L(),"AAA");
        Thread th2 = new Thread(new Thread9L(),"BBBBBB");
        th1.start();
        th2.start();
    }
}
class Thread9L implements Runnable{
    static int ticket = 100;
    static int count = 0;
    public void run(){
        while(true){
            synchronized("L")　　　　//动作原语
            {
                if(ticket>0){
/*                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
*/                    System.out.println(Thread.currentThread().getName() + "\t出售第\t" + ticket-- + "\t张车票。");
                    count++;
                }else{
                    System.out.println(Thread.currentThread().getName() + "\t已售完。\t" + count);
                    break;
                }
            }
        }
    }
}