同步方法和同步代码块

package edu.wtbu;
//不安全的买票
public class Demo08 {
    public static void main(String[] args) {
        buyTicket buyTicket = new buyTicket();

        new Thread(buyTicket,"我").start();
        new Thread(buyTicket,"你").start();
        new Thread(buyTicket,"黄牛党").start();
    }
}
class buyTicket implements Runnable{
    private int ticketNums=10;//票
    boolean flag=true;//外部停止方式
    @Override
    public void run() {
        //买票
        while (flag){
            try {
                //模拟延时
                Thread.sleep(1000);
                buy();
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }

    //synchronized 同步方法，锁的是this
    public synchronized void  buy() throws InterruptedException {
        //判断是否有票
        if(ticketNums<=0){
            flag=false;
            return;
        }

        //买票
        System.out.println(Thread.currentThread().getName()+"拿到了"+ticketNums--);
    }
}

/*synchronized代码块
synchronized(obj){
 */