Java ThreadGroup activeGroupCount() method with Examples

by Online Tutorials Library July 22, 2022

Java ThreadGroup activeGroupCount() method

The activeGroupCount() method of ThreadGroup class returns an estimate of the number of active groups in this thread group and its subgroups. The returned value is only an estimate because the number of thread groups may change dynamically while this method traverses internal data structures.

Syntax

Return

It returns the number of active thread groups with this thread group as an ancestor.

Example

  class NewThread extends Thread   {      NewThread(String threadname, ThreadGroup tg)      {          super(tg, threadname);      }      public void run()      {          for (int i = 0; i < 10; i++)           {              try              {                  Thread.sleep(10);              }              catch (InterruptedException ex) {                  System.out.println(Thread.currentThread().getName()                                     + ” interrupted”); }          }          System.out.println(Thread.currentThread().getName() +                ” completed executing”);      }  }   public class ThreadGroupActiveGroupExp  {      public static void main(String arg[])      {          // creating the thread group          ThreadGroup tg1 = new ThreadGroup(“parent thread group”);          ThreadGroup tg2 = new ThreadGroup(tg1, “child threadGroup”);          ThreadGroup tg3 = new ThreadGroup(tg1, “child threadGroup”);               // creating the threads          NewThread t1 = new NewThread(“Thread-1″, tg1);          System.out.println(t1.getName() + ” starts”);          // this will call the run() method          t1.start();            // checking the number of active thread          System.out.println(“Number of active thread group: ”                             + tg1.activeGroupCount());      }  }  

Test it Now

Output:

Thread-1 starts  Number of active thread group: 2  Thread-1 completed executing

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Java ThreadGroup activeGroupCount() method with Examples

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Return

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