Java ThreadGroup parentOf() Method with Examples

by Online Tutorials Library July 22, 2022

Java ThreadGroup parentOf() method

The parentOf() method of ThreadGroup class tests if the thread group is either the argument of thread group or one of its ancestor thread groups.

Syntax

Parameter

g: It is the thread group

Return

It returns true if the invoking thread is the parent of group. Otherwise, it returns false.

Example

  class NewThread extends Thread   {      NewThread(String threadname, ThreadGroup tg)      {          super(tg, threadname);      }  public void run()      {          for (int i = 0; i < 5; i++)           {              try              {                  Thread.sleep(10);              }              catch (InterruptedException ex){              }          }          System.out.println(Thread.currentThread().getName() + ” completed executing”);      }  }   public class ThreadGroupParentOfExp   {      public static void main(String arg[]) throws InterruptedException,          SecurityException, Exception      {          // creating the thread group          ThreadGroup g1 = new ThreadGroup(“Parent thread”);          ThreadGroup g2 = new ThreadGroup(g1, “Child thread”);             // creating a thread           NewThread t1 = new NewThread(“Thread-1″, g1);          System.out.println(t1.getName()+” starts”);          t1.start();                    // creating another thread           NewThread t2 = new NewThread(“Thread-2″, g1);          System.out.println(t2.getName()+” starts”);          t2.start();                    // checking who is parent thread          boolean isParent = g2.parentOf(g1);          System.out.println(g2.getName() + ” is the parent of ” + g1.getName() +”: “+ isParent);                    isParent = g1.parentOf(g2);          System.out.println(g1.getName() + ” is the parent of ” + g2.getName() +”: “+ isParent);      }  }  

Test it Now

Output:

Thread-1 starts  Thread-2 starts  Child thread is the parent of Parent thread: false  Parent thread is the parent of Child thread: true  Thread-1 completed executing  Thread-2 completed executing

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Java ThreadGroup parentOf() Method with Examples

Java ThreadGroup parentOf() method

Syntax

Parameter

Return

Example

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