/**
*同步方法：public synchronized void method(int args){执行体…}
?*
* synchronized方法控制对(synchronized修饰的方法所在的对象，就是this)“对象”的访问，每个对象对应一把锁，
*每个synchronized方法都必须获得调用该方法的锁才能执行，否则线程会阻塞，synchronized所在方法一旦执行，就独占该锁，
*直到方法执行完才释放锁，后面被阻塞的线程才能获得这个锁，继续执行。
*缺陷：若将一个大的方法声明为synchronized 将会影响效率。需要修改的内容才需要锁，锁的太多，浪费资源。
?*/
public class MyTicker2 {
????public static void main(String[] args) throws InterruptedException {
????????BuyTicker2 ticker = new BuyTicker2();
????????Thread person1Thread = new Thread(ticker, "person1");
????????Thread person2Thread = new Thread(ticker, "person2");
????????Thread person3Thread = new Thread(ticker, "person3");
????????person1Thread.start();
????????person2Thread.start();
????????person3Thread.start();
????}
}
class BuyTicker2 implements Runnable{
//车票
????private int tickerNum = 10;
//停止线程标识
????boolean flag = true;
????@Override
????public void run() {
????????while (flag) {
????????????try {
????????????????buyTicker();
????????????} catch (InterruptedException e) {
????????????????e.printStackTrace();
????????????}
????????}
????}
????private synchronized void buyTicker() throws InterruptedException {
//判断是否还有票
????????if (tickerNum <= 0) {
????????????flag = false;
????????????return;
????????}
//模拟延时
????????Thread.sleep(100);
//买票
System.out.println(Thread.currentThread().getName() + "买到第" + tickerNum -- + "张票");
????}
}