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

Next TopicThreadGroup in Java

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