44 lines
1.4 KiB
Java
44 lines
1.4 KiB
Java
// concurrency/SimpleDaemons.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// Daemon threads don't prevent the program from ending.
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import java.util.concurrent.*;
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public class SimpleDaemons implements Runnable {
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@Override
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public void run() {
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try {
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while(true) {
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TimeUnit.MILLISECONDS.sleep(100);
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System.out.println(
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Thread.currentThread() + " " + this);
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}
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} catch(InterruptedException e) {
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System.out.println("sleep() interrupted");
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}
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}
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public static void main(String[] args) throws Exception {
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for(int i = 0; i < 10; i++) {
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Thread daemon = new Thread(new SimpleDaemons());
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daemon.setDaemon(true); // Must call before start()
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daemon.start();
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}
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System.out.println("All daemons started");
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TimeUnit.MILLISECONDS.sleep(175);
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}
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}
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/* Output:
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All daemons started
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Thread[Thread-6,5,main] SimpleDaemons@b87187
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Thread[Thread-4,5,main] SimpleDaemons@1fb28c1
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Thread[Thread-8,5,main] SimpleDaemons@8ebcf
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Thread[Thread-7,5,main] SimpleDaemons@54761d
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Thread[Thread-9,5,main] SimpleDaemons@156afef
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Thread[Thread-0,5,main] SimpleDaemons@1320c4d
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Thread[Thread-3,5,main] SimpleDaemons@4683f2
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Thread[Thread-2,5,main] SimpleDaemons@4f80f2
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Thread[Thread-5,5,main] SimpleDaemons@29c11d
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Thread[Thread-1,5,main] SimpleDaemons@9df74c
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*/
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