模拟售票程序（关于多线程共享的练习）

package threadDemo;

public class Tickets_Sale {

    public static void main(String[]args){
        
        Sell sell=new Sell();
        new Thread(sell,"窗口一").start();
        new Thread(sell,"窗口二").start();
        new Thread(sell,"窗口三").start();
        new Thread(sell,"窗口四").start();
    }
    
}
class Sell implements Runnable{

    private  int tickets_amount=100;
    
    
    public synchronized void  sellTicket(){
        tickets_amount--;
        if(tickets_amount>0){
        System.out.println(Thread.currentThread().getName()+"卖出一张，余票有"+tickets_amount+"张");
        System.out.println("正在出票");
        try {
            Thread.sleep(500);
            System.out.println("出票成功");
        } catch (InterruptedException e) {
            System.out.println("线程睡眠异常");
            e.printStackTrace();
        }
        }
        
    }
    
    
    @Override
    public void run() {
        while(true){
            if(tickets_amount>0){
                sellTicket();
            }else if(tickets_amount<=0){
                System.out.println("票卖完了");
                return;
            }else{
                System.out.println("系统错误");
                return;
            }
        }
    }
}