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    <p>From <a href="http://docs.oracle.com/javase/6/docs/api/java/util/TimerTask.html" rel="nofollow noreferrer"><code>TimerTask.cancel()</code></a>:</p> <blockquote> <p>Note that calling this method from within the run method of a repeating timer task absolutely guarantees that the timer task will not run again.</p> </blockquote> <p>So once cancelled, it won't ever run again. You'd be better off instead using the more modern <a href="http://java.sun.com/j2se/1.5.0/docs/api/java/util/concurrent/ScheduledExecutorService.html" rel="nofollow noreferrer"><code>ScheduledExecutorService</code></a> (from Java 5+).</p> <p><strong>Edit:</strong> The basic construct is:</p> <pre><code>ScheduledExecutorService exec = Executors.newSingleThreadScheduledExecutor(); exec.scheduleAtFixedRate(runnable, 0, 1000, TimeUnit.MILLISECONDS); </code></pre> <p>but looking into it there's no way of cancelling that task once its started without shutting down the service, which is a bit odd.</p> <p><code>TimerTask</code> might be easier in this case but you'll need to create a new instance when you start one up. It can't be reused.</p> <p>Alternatively you could encapsulate each task as a separate transient service:</p> <pre><code>final ScheduledExecutorService exec = Executors.newSingleThreadScheduledExecutor(); Runnable task1 = new Runnable() { public void run() { a++; if (a == 3) { exec.shutdown(); exec = Executors.newSingleThreadScheduledExecutor(); exec.scheduleAtFixedRate(task2, 0, 1000, TimeUnit.MILLISECONDS) } } }; exec.scheduleAtFixedRate(task1, 0, 1000, TimeUnit.MILLISECONDS); </code></pre>
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    1. POPausing/stopping and starting/resuming Java TimerTask continuously?
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    1. COCould you show me how to implement the `ScheduledExceutorService` in the class above? thanks
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    2. COIt's not the best idea to shutdown the executor service, you can cancel a task via ScheduledFuture returned by scheduleAtFixedRate()
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    3. CO@axtavt: `cancel()` will stop a task already running
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