锁定线程:同步块

package testBlog;

class MyThread implements Runnable {
    private int ticket = 5;

    @Override
    public void run() {
        int x;
        for (x = 0; x < 20; x++) {
            synchronized (this) {// 同步块
                if (ticket > 0) {
                    try {
                        Thread.sleep(100);// 休眠1s,模拟延迟
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println(Thread.currentThread().getName() + "卖票,票数剩余:" + ticket--);// 票数记得要"后--"
                }
            } // 同步块到此结束.同步块中包括:判断是否有票,和卖票两个操作
        }
    }

}

public class Test {
    public static void main(String[] args) {
        MyThread mt = new MyThread();
        new Thread(mt, "票贩子A").start();
        new Thread(mt, "票贩子B").start();
        new Thread(mt, "票贩子C").start();

    }
}