多线程卖票问题

public class Ticket {
    private int number =30;
    public  void sale(){
        if(number > 0){
            System.out.println(Thread.currentThread().getName() + "卖出了" +(number--) + "票，剩余：" + number);
        }
    }
 
    public static void main(String[] args) {
        Ticket ticket =  new Ticket();
        new Thread(()->{
            for (int i = 0; i < 40; i++) {
                ticket.sale();
            }
        },"A").start();
 
        new Thread(()->{
            for (int i = 0; i < 40; i++) {
                ticket.sale();
            }
        },"B").start();
 
        new Thread(()->{
            for (int i = 0; i < 40; i++) {
                ticket.sale();
            }
        },"C").start();
    }
}