Queuing processes - java

I need to do it in java, so that I can put processes in a queue and they are executed in turn.

Tipo: One process monitors the queue, if the queue is not equal to 0, it starts processes from this queue

How to implement this correctly, I just tried and then nothing works for me

Queue:

Queue<Thread> queue = new LinkedList<>();

The process monitoring the queue:

new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    if (queue.size() != 0) {
                        Thread th = queue.peek();
                        queue.remove();
                        th.start();
                        try {
                            th.join();
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }).start();

Function for adding processes to the queue:

private void sendToDevice(final String string) {
        queue.add(new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    outStream.write(string.getBytes());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }));
    }