java多线程同步模拟卖票过程的问题

java多线程同步模拟卖票过程的问题 Java两种方法实现模拟卖票 第一种继承Thread类

public class TestThread extends Thread{
    //定义静态变量,为所有对象所共有
    private static int ticket = 50;
    //定义静态对象 object，保证在使用时synchronized获得对象的唯一性
    //不然main方法里new多个对象就有多个锁
    private static Object object = new Object();
    //定义线程名称
    public TestThread(String name) {
        super(name);
    }
    @Override
    public void run(){
        while (true){
            //这里不能用this，这里的this代表test1，test2，test3三个对象，锁不唯一
            //方式一
            //synchronized(object){
            //方式二
            //获取TestThread1的class对象，class 类名 = 类名.class,类名.class只会加载一次
            synchronized(TestThread1.class){
                 if(ticket > 0){
                    try {
                        Thread.sleep(10);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println(Thread.currentThread().getName() + "卖票，票号为：" + ticket);
                    ticket--;
                }else{
                     break;
                 }
            }
        }
    }
    public static void main(String[] args) throws Exception {
        TestThread test1 = new TestThread("窗口1");
        TestThread test2 = new TestThread("窗口2");
        TestThread test3 = new TestThread("窗口3");

        test1.start();
        test2.start();
        test3.start();

    }
}

第二种实现Runnable接口

public class RunnableTest {
    public static void main(String[] args) {
        MyThear1 myThear1 = new MyThear1();

        Thread thread1 = new Thread(myThear1,"窗口1");
        Thread thread2 = new Thread(myThear1,"窗口2");
        Thread thread3 = new Thread(myThear1,"窗口3");

        thread1.start();
        thread2.start();
        thread3.start();


    }
}

class MyThear1 implements Runnable{
    private static int ticket = 30;
    //方式一 保证在使用时synchronized获得对象的唯一性
    Object object = new Object();
    //该子类应重写 Thread 类的 run 方法
    @Override
    public void run() {

        while (true){
            //方式一
            //synchronized(object){
            //方式二
            //此时的this唯一的MyThear1对象
            //synchronized (this){
            //方式三 获取的MyThear1的class对象
            synchronized(MyThear1.class){
                if (ticket > 0) {
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                    System.out.println(Thread.currentThread().getName() + "卖出票号：" + ticket);
                    ticket--;
                } else {
                    break;
                }
          }

        }
    }