老师，我这里又创建了一个线程3和1一样的 同时执行，为什么线程2每次唤醒的都是线程1，都是线程1拿到锁，而没有唤醒线程3，这是不是没体现notify的随机唤醒线程？？？
public class Wait {

public static Object object = new Object();

static class Thread1 extends Thread {

    @Override
    public void run() {
        synchronized (object) {
            System.out.println(Thread.currentThread().getName() + "开始执行了");
            try {
                object.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("线程" + Thread.currentThread().getName() + "获取到了锁。");
        }
    }
}

static class Thread2 extends Thread {

    @Override
    public void run() {
        synchronized (object) {
            object.notify();
            System.out.println("线程" + Thread.currentThread().getName() + "调用了notify()");
        }
    }
}

static class Thread3 extends Thread {

    @Override
    public void run() {
        synchronized (object) {
            System.out.println(Thread.currentThread().getName() + "开始执行了");
            try {
                object.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("线程" + Thread.currentThread().getName() + "获取到了锁。");
        }
    }
}

public static void main(String[] args) throws InterruptedException {
    Thread1 thread1 = new Thread1();
    Thread2 thread2 = new Thread2();
    Thread3 thread3 = new Thread3();
    thread1.start();
    thread3.start();
    Thread.sleep(200);
    thread2.start();
    System.out.println(thread3.getState());
}

}