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synchronized同步方法代码示例

//不安全的买票//线程不安全，有负数public class UnsafeBuyTicket {       public static void main(String[] args) {           BuyTicket station = new BuyTicket();        new Thread(station,"我").start();        new Thread(station,"你").start();        new Thread(station,"黄牛党").start();    }}class BuyTicket implements Runnable{       //票    private int ticketNums = 10;    boolean flag = true;//外部停止方式    @Override    public void run() {           //买票        while (flag){               try {                   buy();            } catch (InterruptedException e) {                   e.printStackTrace();            }        }    }    //synchronized方法，锁的是this    private synchronized void buy()throws InterruptedException{           //判断是否有票        if (ticketNums<=0){               flag = false;            return;        }        //模拟延时        Thread.sleep(100);        //买票        System.out.println(Thread.currentThread().getName() + "拿到" + ticketNums--);    }}