Java ThreadGroup list() method

The list() method of ThreadGroup class is used to display the information about the thread group. It is useful only for debugging.

Syntax

Return

This method does not return any value.

Example

class List extends Thread 
{
    List(String threadname, ThreadGroup tgob)
    {
        super(tgob, threadname);
    }
    public void run()
    {
        for (int i = 0; i < 10; i++) 
        {
            try
            {
                Thread.sleep(10);
            }
            catch (InterruptedException ex){
            }
        }
        System.out.println(Thread.currentThread().getName() + " completed executing");
    }
} 
public class ThreadGroupListExp 
{
    public static void main(String arg[]) throws InterruptedException,
        SecurityException, Exception
    {
        // creating the thread group
        ThreadGroup tg1 = new ThreadGroup("Parent thread");
        ThreadGroup tg2 = new ThreadGroup(tg1, "Child thread");
        
        // creating a thread
        List t1 = new List("Thread-1", tg1);
        System.out.println(t1.getName() +" starts");
        t1.start();
        
        // creating an another thread
        List t2 = new List("Thread-2", tg1);
        System.out.println(t2.getName() +" starts");
        t2.start();
 
        // listing contents of parent ThreadGroup
        System.out.println("\nListing parentThreadGroup: " + tg1.getName() + ":");
        // prints information about this thread group to the standard output
        tg1.list();
    }
}

Test it Now

Output:

Thread-1 starts
Thread-2 starts

Listing parentThreadGroup: Parent thread:
java.lang.ThreadGroup[name=Parent thread,maxpri=10]
    Thread[Thread-1,5,Parent thread]
    Thread[Thread-2,5,Parent thread]
    java.lang.ThreadGroup[name=Child thread,maxpri=10]
Thread-1 completed executing
Thread-2 completed executing

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