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    <p>I would do it with semaphores. The threads are requiring their own semaphore and when finished, release the next semaphore. You can of course also do this with monitors (<code>Object#wait() and Object#notify()</code>). To ensure them running in a circular fashion, you simply let them run in endless loops and waiting for the semaphores to be filled:</p> <pre><code>import java.util.concurrent.Semaphore; public class Main { private Semaphore a = new Semaphore(1), b = new Semaphore(0), c = new Semaphore(0); public class A implements Runnable { @Override public void run() { while (true) { try { a.acquire(1); Thread.sleep((long) (Math.random() * 1000)); System.out.println("performing task A"); b.release(1); } catch (InterruptedException e) {} } } } public class B implements Runnable { @Override public void run() { while (true) { try { b.acquire(1); Thread.sleep((long) (Math.random() * 1000)); System.out.println("performing task B"); c.release(1); } catch (InterruptedException e) {} } } } public class C implements Runnable { @Override public void run() { while (true) { try { c.acquire(1); Thread.sleep((long) (Math.random() * 1000)); System.out.println("performing task C"); a.release(1); } catch (InterruptedException e) {} } } } public void startThreads() { new Thread(new A()).start(); new Thread(new B()).start(); new Thread(new C()).start(); } public static void main(String[] args) throws InterruptedException { Main ld = new Main(); ld.startThreads(); } } </code></pre> <p>The cool thing with this solution as opposed to monitors is that you can simply fill up a semaphore from the outside to start a second "thread-worm" to run in circles.</p>
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