Java Data Type Tutorial - Java ThreadGroup.isDaemon()

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Syntax

ThreadGroup.isDaemon() has the following syntax.

public final boolean isDaemon()

Example

In the following code shows how to use ThreadGroup.isDaemon() method.

/*from w  w  w.  j  av a  2 s . com*/
public class Main {
  public static void main(String[] args) {
    ThreadGroupDemo tg = new ThreadGroupDemo();
  }
}

class ThreadGroupDemo implements Runnable {
  public ThreadGroupDemo(){

    ThreadGroup pGroup = new ThreadGroup("Parent ThreadGroup");

    ThreadGroup cGroup = new ThreadGroup(pGroup, "Child ThreadGroup");

    Thread t1 = new Thread(pGroup, this);
    System.out.println("Starting " + t1.getName());
    t1.start();

    Thread t2 = new Thread(cGroup, this);
    System.out.println("Starting " + t2.getName());
    t2.start();

    System.out.println("Active threads in " + pGroup.getName() + " = "
        + pGroup.activeCount());

    System.out.println("Is " + pGroup.getName() + " a daemon ThreadGroup? "
        + pGroup.isDaemon());
    System.out.println("Is " + cGroup.getName() + " a daemon ThreadGroup? "
        + cGroup.isDaemon());
  }
  public void run() {
    System.out.println(Thread.currentThread().getName()
        + " finished executing.");
  }
}

The code above generates the following result.

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