Java thread as argument to a class

Question

Can I pass a Thread (which runs an instance of a class) to another class which then runs as a Thread too and handle the first from the second?

This is some sample/explain code:

 Sender sender = new Sender(client, topic, qos,frequency);
 Thread t1;
 t1= new Thread(sender);
 t1.start();


 Receiver receiver = new Receiver(frequency,client, qos, topic,t1);
 Thread t2;
 t2 = new Thread(receiver);
 t2.start();

Both classes implement runnable and I want the sender to call wait himself but the receiver to notify it. I tried it but nothing happens, sender is still in waiting state.

I can provide the whole code if needed.

Answer 1

Here's some stripped down code that does what I think you are asking:

public class WaitTest {

    static class Waiter implements Runnable{

        @Override
        public void run() {
            System.out.println("Waiting");
            try {
                synchronized(this){
                    this.wait();
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            System.out.println("Running");
        }

    }

    static class Notifier implements Runnable{

        Object locked;

        public Notifier(Object locked){
            this.locked = locked;
        }

        @Override
        public void run() {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            synchronized(locked){
                locked.notifyAll();
            }

        }

    }

    public static void main(String[] args){

        Waiter waiter = new Waiter();
        Notifier notifier = new Notifier(waiter);

        Thread t1 = new Thread(waiter);
        Thread t2 = new Thread(notifier);

        t1.start();
        t2.start();
    }

}