多线程（同步锁）

public class Site implements Runnable{   private int count=10;  //记录剩余票数       private int num = 0;   //记录买到第几张票   boolean isRunning=true;   public void  run(){      while(isRunning){         sale();      }   }   public synchronized void sale(){      if(count<=0){         isRunning=false;         return;      }      //第一步：修改数据      num++;      count--;      try {         Thread.sleep(500); //模拟网络延时      } catch (InterruptedException e) {         e.printStackTrace();      }      //第二步：显示信息      System.out.println(Thread.currentThread().getName()+"抢到第"+num+"张票，剩余"+count+"张票！");   }
}
public class Test {   public static void main(String[] args) {      Site site = new Site();      Thread person1= new Thread(site,"桃跑跑");      Thread person2= new Thread(site,"抢票代理");      Thread person3= new Thread(site,"黄牛党");      System.out.println("********开始抢票********");      person1.start();      person2.start();      person3.start();   }}