Problem in Threading , ThreadGroup

Class number 1

Code :

class PrintNameThread extends Thread
{
 
    public PrintNameThread(String name) {
        super(name);
    }
 
    public void run(){
        String name = super.getName();
        for(int x = 0 ; x < 10 ; x++)
        {
            System.out.println(name);
        }
    }
 
}

Class number 2

Code :

class PrintNameThreadv2 extends Thread
{
 
    public PrintNameThreadv2(String name) {
        super(name);
        super.setPriority(Thread.MAX_PRIORITY);
       // super.setDaemon(true);
        super.start();
    }
 
    public void run(){
        String name = super.getName();
        for(int x = 0 ; x < 10 ; x++)
        {
            System.out.println(name);
        }
    }
 
}

Class number 3

Code :

class PrintNameThreadv3 implements Runnable
{
    String name ;
    public PrintNameThreadv3(String name) {
        this.name = name ;
    }
 
    public void run(){
        for(int x = 0 ; x < 10 ; x++)
        {
            System.out.println(this.name);
        }
    }
}

Main Class

Code :

public class ThreadGroupDemo01 {
    public static void main(String args[])
    {
        PrintNameThread t1 = new PrintNameThread("System");
        t1.setPriority(Thread.MAX_PRIORITY);
        t1.start();
        PrintNameThreadv2 t2 = new PrintNameThreadv2("Access");
 
        PrintNameThreadv3 t3 = new PrintNameThreadv3("NEO");
        Thread th = new Thread(t3);
        th.start();
 
        //Define an array to store current threads.
        Thread threadArray[];
 
        //Return current  thread-group
        ThreadGroup tg = Thread.currentThread().getThreadGroup();
        int num = tg.activeCount();
        System.out.println("Total running thread are " + num);
 
        threadArray = new Thread[num];
        tg.enumerate(threadArray);
 
        for(int i = 0 ; i < num ; i++)
        {
            System.out.println("Thread name : " + threadArray[i].getName() + " , " +
                               "Thread priority : " + threadArray[i].getPriority()+ " , " +
                               "Group name : " + threadArray[i].getThreadGroup().getName());
        }
        /**/
 
 
    }
}

I want to ask about why it's print 2 of current running threads.It's have to be 4
System,Access,Neo,Main
There is something wrong i didn't knew it...So if any one have can say something about this
or i misunderstand something.