Question

java售票系统怎么做到同步的

Answer 1

//票这个类中的售票方法加锁synchronized
public class Tickets implements Runnable {

int ticket=4;

public void run() {
sellticket();
}

public synchronized void sellticket(){
int ticket=this.ticket;
if(ticket>0){
System.out.println("顾客到达"+Thread.currentThread().getName()+"站台");
System.out.println("售票台"+ticket+"票,处理5秒");
try{
for(int i=0;i<5;i++){
Thread.sleep(200);
System.out.print(i+"分钟");
}
System.out.println("卖出第"+ticket);
System.out.println("----------------");
--ticket;
}catch(InterruptedException e){
System.err.println("买票不成功");
System.exit(1);
}

}

}
}
//测试类
public class SellTicket {
public static void main(String args[]){
Tickets t=new Tickets();
Thread t1=new Thread(t);
Thread t2=new Thread(t);
Thread t3=new Thread(t);
Thread t4=new Thread(t);

t1.start();
t2.start();
t3.start();
t4.start();
}
}

Answer 2

不需要同步，因为显示的时间就是你服务器的时间

Answer 3

不断刷新页面