synchronize类锁用父类作为锁能否锁住代码块

public class Demo {
    public void demo1(){
        synchronized (Demo.class){
            while (true){
                System.out.println(Thread.currentThread());
            }
        }
    }
}

public class DemoSon extends Demo implements Runnable{
    @Override
    public void run() {
        demo1();
    }
}

public class DemoSon2 extends Demo implements Runnable{
    @Override
    public void run() {
        demo1();
    }
}

public class Test {
    public static void main(String[] args) {
        Thread thread1 = new Thread(new DemoSon());
        Thread thread2 = new Thread(new DemoSon2());
        thread1.start();
        thread2.start();
    }
}