Java ThreadGroup getParent() method with Examples

by Online Tutorials Library July 22, 2014

Java ThreadGroup getParent() method

The getParent() method of ThreadGroup class returns the parent of the thread group.

Syntax:

Return:

This method returns the parent of the thread group.

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 ThreadGroupGetParentExp   {      public static void main(String arg[]) throws InterruptedException,          SecurityException, Exception      {          // creating a parent threadGroup          ThreadGroup tg1 = new ThreadGroup(“Parent thread”);          // creating a child threadGroup           ThreadGroup tg2 = new ThreadGroup(tg1, “Child thread”);            // creating a thread           NewThread t1 = new NewThread(“Thread-1”, tg1);          System.out.println(“Starting Thread-1”);          t1.start();           // creating another thread           NewThread t2 = new NewThread(“Thread-2”, tg2);          System.out.println(“Starting Thread-2”);          t2.start();            // print the parentThreadGroup of parent thread          System.out.println(“ParentThreadGroup for ” +              tg1.getName() + ” is ” + tg1.getParent().getName());          // print the parentThreadGroup of child thread          System.out.println(“ParentThreadGroup for ” +              tg2.getName() + ” is ” + tg2.getParent().getName());          }  }  

Test it Now

Output:

Starting Thread-1  Starting Thread-2  ParentThreadGroup for Parent thread is main  ParentThreadGroup for Child thread is Parent thread  Thread-1 completed executing  Thread-2 completed executing

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Java ThreadGroup getParent() method with Examples

Java ThreadGroup getParent() method

Syntax:

Return:

Exception:

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