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

Next TopicMultithreading Java

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