Java Thread activeCount() method

The activeCount() method of thread class is used to return the number of active threads in the current thread's thread group. The value returned is only an estimate because the number of threads may change dynamically while this method traverses internal data structures.

Syntax

Return

It returns the number of active threads in the current thread's thread group.

Example

public class JavaActiveCountExp extends Thread 
{
    JavaActiveCountExp(String threadname, ThreadGroup tg)
    {
        super(tg, threadname);
        start();
    }
    public void run()
    {
       System.out.println("running thread name is: "+Thread.currentThread().getName());  
    }
    public static void main(String arg[])
    {
        // creating the thread group
        ThreadGroup g1 = new ThreadGroup("parent thread group");

        // creating a thread 
        JavaActiveCountExp t1 = new JavaActiveCountExp("Thread-1", g1);
        // creating another thread 
        JavaActiveCountExp t2 = new JavaActiveCountExp("Thread-2", g1);

        // checking the number of active thread
        System.out.println("number of active thread: "+ g1.activeCount());
    }
}

Test it Now

Output:

number of active thread: 2
running thread name is: Thread-1
running thread name is: Thread-2

Next TopicMultithreading Java

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Java Thread activeCount() method

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