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    <p>Generally speaking, the way to do this is to have each of the other threads periodically check a flag. Often background threads loop, waiting for work - they just have to check the flag each time they go round a loop. If they're using <code>Object.wait()</code> or something similar to be told that there's more work, the same notification should be used to indicate that the thread should stop too. (Don't just spin until you're stopped - that will suck CPU. Don't just use sleep - that will delay termination.)</p> <p>That allows all threads to terminate cleanly, releasing resources appropriately. Other options such as <code>interrupt()</code> and the deprecated <code>destroy()</code> method are much harder to control properly, IMO. (Interrupting a thread is better than hard-aborting it, but it has its own set of problems - such as the interruption is only processed at certain points anyway.)</p> <p>EDIT: In code, it would look something like:</p> <pre><code>// Client code for (Task task : tasks) { task.stop(); } // Threading code public abstract class Task implements Runnable { private volatile boolean stopped = false; public void stop() { stopped = true; } protected boolean shouldStop() { return stopped; } public abstract void run(); } </code></pre> <p>Your tasks would then subclass <code>Task</code>. You would need to make it slightly more complicated if you wanted the <code>stop()</code> method to also notify a monitor, but that's the basic idea.</p> <p>Sample task:</p> <pre><code>public class SomeTask extends Task { public void run() { while (!shouldStop()) { // Do work } } } </code></pre>
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    1. POHow to stop threads in Java?
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    1. POHow to stop threads in Java?
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    1. COcan you please explain it pro grammatically. How can I implement it in my program. You can take a look at a portion of my program at http://stackoverflow.com/questions/1611822/how-to-join-one-thread-with-other-in-java
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      1. USYatendra Goel
    2. CO"Periodically checking a flag" is also called "Active Waiting" and not recommenend. Use wait/notify to avoid this.
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      1. USgia
    3. CO@pimpf0r: You only need to use wait/notify if you'd otherwise spin or sleep. If you have a constant stream of work, it's fine. Note that I've mentioned using wait() in the answer if you'd otherwise want to sleep.
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