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The sleep() method is a static method of class Thread. You use it in your code to slow a thread down by forcing it to go into a sleep mode before coming back to runnable (where it still has to beg to be the currently running thread). When a thread sleeps, it drifts off somewhere and doesn t return to runnable until it wakes up.
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So why would you want a thread to sleep Well, you might think the thread is moving too quickly through its code. Or you might need to force your threads to take turns, since reasonable turn-taking isn t guaranteed in the Java specifications. Or imagine a thread that runs in a loop, downloading the latest stock prices and analyzing them. Downloading prices one after another would be a waste of time, as most would be quite similar, and even more importantly it would be an incredible waste of precious bandwidth. The simplest way to solve this is to cause a thread to pause (sleep) for five minutes after each download. You do this by invoking the static Thread.sleep() method, giving it a time in milliseconds as follows:
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try { Thread.sleep(5*60*1000); // Sleep for 5 minutes } catch (InterruptedException ex) { }
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Notice that the sleep() method can throw a checked InterruptedException (which you ll usually know if that were a possibility, since another thread has to explicitly do the interrupting), so you re forced to acknowledge the exception with a handle or declare. Typically, you just wrap each call to sleep in a try/catch, as in the preceding code. Let s modify our Fred, Lucy, Ricky code by using sleep to try to force the threads to alternate rather than letting one thread dominate for any period of time. Where do you think the sleep() method should go
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class NameRunnable implements Runnable { public void run() { for (int x = 1; x < 4; x++) { System.out.println("Run by " + Thread.currentThread().getName()); try { Thread.sleep(1000); } catch (InterruptedException ex) { } } } } public class ManyNames { public static void main (String [] args) { NameRunnable nr = new NameRunnable(); // Make one Runnable Thread one = new Thread(nr); one.setName("Fred"); Thread two = new Thread(nr); two.setName("Lucy"); Thread three = new Thread(nr);
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three.setName("Ricky"); one.start(); two.start(); three.start(); } }
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Running this code shows Fred, Lucy, and Ricky alternating nicely:
% java Run by Run by Run by Run by Run by Run by Run by Run by Run by ManyNames Fred Lucy Ricky Fred Lucy Ricky Fred Lucy Ricky
Just keep in mind that the behavior in the preceding output is still not guaranteed. You can t be certain how long a thread will actually run before it gets put to sleep, so you can t know with certainty that only one of the three threads will be in the runnable state when the running thread goes to sleep. In other words, if there are two threads awake and in the runnable pool, you can t know with certainty that the least-recentlyused thread will be the one selected to run. Still, using sleep() is the best way to help all threads get a chance to run! Or at least to guarantee that one thread doesn t get in and stay until it s done. When a thread encounters a sleep call, it must go to sleep for at least the specified number of milliseconds (unless it is interrupted before its wake-up time, in which case it immediately throws the InterruptedException).
Just because a thread s sleep() expires, and it wakes up, does not mean it will return to running! Remember, when a thread wakes up it simply goes back to the runnable state. So the time specified in sleep() is the minimum duration in which the thread won t run, but it is not the exact duration in which the thread won t run. So you can t, for example, rely on the sleep() method to give you a perfectly accurate timer. Although in many applications using sleep() as a timer is certainly good enough, you must know that a sleep() time is not a guarantee that the thread will start running again as soon as the time expires and the thread wakes.
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Remember that sleep() is a static method, so don t be fooled into thinking that one thread can put another thread to sleep. You can put sleep() code anywhere, since all code is being run by some thread. When the executing code (meaning the currently running thread s code) hits a sleep() call, it puts the currently running thread to sleep.
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