07Java多线程-16. 线程通讯代码实现之同步代码块

/*
    同步代码块
    synchronized(同步监视器){
        //需要同步的代码
    }
    同步监视器:俗称 锁,可以是任何实例化的类.但是需要共用同一个实例.
 */
class WindowSell implements Runnable{
    Object obj = new Object();
    private int ticket = 100;
    @Override
    public void run() {
        while (true) {
            synchronized(obj){
                if (ticket > 0) {
                    System.out.println(Thread.currentThread().getName() + "sell " + ticket--);
                }else{
                    break;
                }
            }
            Thread.yield();
        }

    }
}
public class ThreadTestTicket {
    public static void main(String[] args) {
        WindowSell win = new WindowSell();
        Thread t1 = new Thread(win);
        t1.setName("1号窗口");
        Thread t2 = new Thread(win);
        t2.setName("2号窗口");
        Thread t3 = new Thread(win);
        t3.setName("3号窗口");

        t1.start();
        t2.start();
        t3.start();
    }
}