售票任务（线程）

售票的线程方式一（thread）：

class SaleTickets extends Thread {
    static int num = 50; // 总票数 共享的数据，三个窗口同时操作同一份数据
    //static Object o = new Object();
    public SaleTickets (String name) {
        super(name);
    }
   // 重写run方法：卖票的任务
    public void run() {
       
        while (true) {
            synchronized ("hh") { //任意类型的对象，锁对象应该是同一个对象
                try {
                    Thread.sleep(500);
                } catch (InterruptedException e) {
                    // TODO: handle exception
                    e.printStackTrace();
                }
                if(num > 0) {
                    System.out.println(this.getName() + "卖了第" + num + "票");
                    num--;
                
                } else {
                    System.out.println("票已售完");
                    break;
                }
            }
        
            
        }
    }
    
}
public class Demo4 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
       SaleTickets t1 = new SaleTickets("窗口1");
       SaleTickets t2 = new SaleTickets("窗口2");
       SaleTickets t3 = new SaleTickets("窗口3");
       t1.start();
       t2.start();
       t3.start();
    }

}

售票的线程方式二（Runnable）：

class SaleTickets1 implements Runnable {
    static int num = 50;
     public void run() {
         while (true) {
             synchronized ("djj") {
                 if (num > 0) {
                        System.out.println(Thread.currentThread().getName() + "卖出第" + num + "张票");
                        num--;
                    } else {
                        System.out.println("票已售尽");
                         break;
                    }
             }
            
        }
        
    }
}
public class Demo8 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        //创建实现类对象
       SaleTickets1 st = new SaleTickets1();
       // 创建三个线程对象
       Thread t = new Thread(st, "窗口1");
       Thread t1 = new Thread(st, "窗口2");
       Thread t2 = new Thread(st, "窗口3");
       t.start();
       t1.start();
       t2.start();
    }

}