Java ThreadGroup setDaemon() method with Examples

by Online Tutorials Library July 22, 2022

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

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Java ThreadGroup setDaemon() method with Examples

Java ThreadGroup setDaemon() method

Syntax:

Parameter:

Exception:

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