Java ThreadGroup setDaemon() method

The setDaemon() method of ThreadGroup class tests if the thread group is a daemon thread group.

Syntax:

Parameter:

daemon: If true, marks the thread group as a daemon thread group; otherwise, marks the thread group as normal.

Exception:

SecurityException: If the current thread cannot modify the thread group.

Example

class NewThread extends Thread 
{
    NewThread(String threadname, ThreadGroup tg)
    {
        super(tg, threadname);
    }
    public void run()
    {
        for(int i = 0;i < 10;i++) 
        {
            i++;
        }
        System.out.println(Thread.currentThread().getName() + " completed executing");
    }
}
public class ThreadGroupSetDaemonExp 
{
    public static void main(String arg[]) throws InterruptedException,
        SecurityException, Exception
    {
        // creating a parent threadGroup
        ThreadGroup tg1 = new ThreadGroup("Parent thread");
        tg1.setDaemon(true);

        // creating a child threadGroup 
        ThreadGroup tg2 = new ThreadGroup(tg1, "Child thread");
        tg2.setDaemon(false);

        // creating a thread 
        NewThread t1 = new NewThread("Thread-1", tg1);
        t1.start();

       // creating another thread 
        NewThread t2 = new NewThread("Thread-2", tg2);
        t2.start();

        // returns true if this thread group is a daemon thread group
        System.out.println("Is " + tg1.getName() + " a daemon threadGroup? " + tg1.isDaemon());
        System.out.println("Is " + tg2.getName() + " a daemon threadGroup? " + tg2.isDaemon());
    }
}

Test it Now

Output:

Is Parent thread a daemon threadGroup? true
Is Child thread a daemon threadGroup? false
Thread-1 completed executing
Thread-2 completed executing

Next TopicThreadGroup in Java

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