继承法

package com.atguigu.java;
/**
 *使用同步方法
 *
 * @author Dxkstart
 * @create 2021-05-07 18:16
 */
public class WindowTest5 {
    public static void main(String[] args) {
        Window5 w1 = new Window5();
        Window5 w2 = new Window5();
        Window5 w3 = new Window5();
        w1.start();
        w2.start();
        w3.start();
    }
}
class Window5 extends Thread {
    private static int ticket = 100;//票数
    @Override
    public void run() {
        while(true){
            show();
        }
    }
    public static synchronized void show(){//同步监视器：Window5.class
//    public synchronized void show(){//同步监视器：w1、w2、w3,此种解决方法时错误的
        if(ticket > 0){
            try {
                sleep(50);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName() + ": 卖票，票号为" + ticket);
            ticket --;
        }
    }
}