Daemon Thread

Question

Hi buddies, What is Daemon Thread in java? Please give an example of Daemon Thread. Thanks!

Aarti · Answer

In Java, any thread can be a Daemon thread. Daemon threads are like a service providers for other threads or objects running in the same process as the daemon thread. Daemon threads are used for background supporting tasks and are only needed while normal threads are executing. If normal threads are not running and remaining threads are daemon threads then the interpreter exits. setDaemon(true/false) ? This method is used to specify that a thread is daemon thread. public boolean isDaemon() ? This method is used to determine the thread is daemon thread or not. The following program demonstrates the Daemon Thread: public class DaemonThread extends Thread { public void run() { System.out.println("Entering run method"); try { System.out.println("In run Method: currentThread() is" + Thread.currentThread()); while (true) { try { Thread.sleep(500); } catch (InterruptedException x) { } System.out.println("In run method: woke up again"); } } finally { System.out.println("Leaving run Method"); } } public static void main(String[] args) { System.out.println("Entering main Method"); DaemonThread t = new DaemonThread(); t.setDaemon(true); t.start(); try { Thread.sleep(3000); } catch (InterruptedException x) { } System.out.println("Leaving main method"); }

Sam Hobbs · Answer

The term Daemon is a Unix term; Windows does not use that term. I believe that in Unix a Daemon is what Windows calls a service, but I am not sure. So you really should have more context for your question. If this is a class assignment question, then you just need to do some reading. If you need an answer in the context of .Net or the wider context of Windows then you need to clarify your question.

John Penn · Answer

Umm... I'm not sure how many Java experts you're going to find at a C#.Net site, but in any event, Google is your friend .

Daemon Thread

Answers (3)