Worker and Co-ordinator threads.

Main.java

import java.lang.*;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

class Signal {
    ReadWriteLock lock = new ReentrantReadWriteLock();
    volatile boolean running = true;

    public void stop() {
        lock.writeLock().lock();
        running = false;
        lock.writeLock().unlock();
    }

    public boolean isStopped() {
        boolean running;

        lock.readLock().lock();
        running = this.running;
        lock.readLock().unlock();

        return !running;
    }
}

class QueueMonitor implements Runnable {
    final String queue;
    final Signal signal;

    public QueueMonitor(final String queue, final Signal signal) {
        this.queue = queue;
        this.signal = signal;
    }

    public void run() {
        try {
            for (; ; ) {
                // do some work...
                Thread.sleep(1000);
                System.out.println(queue);
                if (signal.isStopped()) break;
            }
        } catch(InterruptedException ex) {
            ex.printStackTrace();
        }
    }
}

class Coordinator implements Runnable {
    final Signal signal;
    public Coordinator(final Signal signal) {
        this.signal = signal;
    }

    public void run() {
        System.console().readLine();
        signal.stop();
    }
}

public class Main {
    public static void main(final String[] args) throws InterruptedException {
        final String[] queues = {"policies", "settlements", "claims", "quotes"};
        final Thread[] threads = new Thread[queues.length];
        final Signal signal = new Signal();

        for (int i = 0; i < queues.length; i++) {
            System.out.println(queues[i]);
            threads[i] = new Thread(new QueueMonitor(queues[i], signal));
            threads[i].start();
        }

        Thread t = new Thread(new Coordinator(signal));
        t.start();

        for (int j = 0; j < queues.length; j++) {
            threads[j].join();
        }
    }
}