android java wait notify synchronized

class ThreadA extends Thread{
    public ThreadA(String name) {
        super(name);    }
    public void run() {
        synchronized (this) {
            try {
                Thread.sleep(1000); //  使当前线阻塞 1 s，确保主程序的 t1.wait(); 执行之后再执行 notify()              } catch (Exception e) {
                e.printStackTrace();            }
            System.out.println(Thread.currentThread().getName()+" call notify()");            // 唤醒当前的wait线程              this.notify();        }
    }
}
public class main {
    public static void main(String[] args) {
        ThreadA t1 = new ThreadA("t1");        synchronized(t1) {
            try {
                // 启动“线程t1”                  System.out.println(Thread.currentThread().getName()+" start t1");                t1.start();                // 主线程等待t1通过notify()唤醒。                  System.out.println(Thread.currentThread().getName()+" wait()");                t1.wait();  //  不是使t1线程等待，而是当前执行wait的线程等待                  System.out.println(Thread.currentThread().getName()+" continue");            } catch (InterruptedException e) {
                e.printStackTrace();            }
        }
    }
}