Java ThreadGroup enumerate() method with Examples

by Online Tutorials Library July 22, 2022

Java ThreadGroup enumerate() method

The enumerate() method of ThreadGroup class is used to copy every active thread’s thread group and its subgroup into the specified array. This method calls the enumerate method with the tarray argument.

Syntax

Parameter

tarray: It is an array of Thread objects to copy to.

Return

This method returns the number of threads put into the array.

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 ThreadGroupEnumerateExp  {      public static void main(String arg[])       {          // creating the ThreadGroup          ThreadGroup g1 = new ThreadGroup(“Parent thread”);          // creating a child ThreadGroup for parent ThreadGroup          ThreadGroup g2 = new ThreadGroup(g1, “child thread”);             // creating a thread           NewThread t1 = new NewThread(“Thread-1”, g1);          System.out.println(“Starting of Thread-1”);          t1.start();          // creating another thread           NewThread t2 = new NewThread(“Thread-2”, g1);          System.out.println(“Starting of Thread-2″);          t2.start();             // returns the number of threads put into the array          Thread[] tarray = new Thread[g1.activeCount()];          int count = g1.enumerate(tarray);                    // prints active threads          for (int i = 0; i < count; i++)               System.out.println(tarray[i].getName() + ” found”);      }  }  

Test it Now

Output:

Starting of Thread-1  Starting of Thread-2  Thread-1 found  Thread-2 found  Thread-2 completed executing  Thread-1 completed executing

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Java ThreadGroup enumerate() method with Examples

Java ThreadGroup enumerate() method

Syntax

Parameter

Return

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