ThreadDemo1.java

class ThreadDemo1_1 extends Thread   
{  
    ThreadDemo1_1(String a, ThreadGroup b)  
    {  
        super(b, a);  
    }  
    public void run()  
    {  
        for (int i = 0; i< 10; i++)   
        {  
            try  
            {  
                Thread.sleep(10);  
            }  
            catch (InterruptedException ex)   
            {  
                System.out.println(Thread.currentThread()
.getName());  
            }  
        }  
        System.out.println(Thread.currentThread()
.getName());  
    }  
}   
public class ThreadDemo1
{  
    public static void main(String arg[]) throws 
InterruptedException, SecurityException
    {  

        ThreadGroup obj1 = new ThreadGroup("Parent
 thread =====> ");  
        ThreadGroup obj2 = new ThreadGroup(obj1, 
"child thread =====> ");  
        ThreadDemo1_1 t1 = new ThreadDemo1_1("*******
Thread-1*******", obj1);  
        t1.start();   
        ThreadDemo1_1 t2 = new ThreadDemo1_1("*******
Thread-2*******", obj1);  
        t2.start();   
        obj1.checkAccess();  
        System.out.println(obj1.getName() + " has 
access");  
        obj2.checkAccess();  
        System.out.println(obj2.getName() + " has 
access");  
    }  
}