class NewThread extends Thread 
{
    NewThread()
    {
    	super("Demo1 Thread");
    	System.out.println("Child thread:"+this);
    	start();
    }
    
    public void run()
    {
    	try
    	{
    		for(int i=20;i>0;i--)
    			System.out.println("Child Thread :"+i);
    		Thread.sleep(5000);
    		
    	}catch(InterruptedException e)
    	{
    		System.out.println("Exiting child thread.");
    	}
    	System.out.println("Exiting child thread");
    }
    
}

class ExtendThread
{
	public static void main(String args[])
	{
		new NewThread();
		try
		{
			for(int i=15;i>0;i--)
			{
				System.out.println("Main Thread :"+i);
				Thread.sleep(1000);
			}
		}catch(InterruptedException e)
		{
			System.out.println("Main thread interrrupted.");
		}
		System.out.println("Main thread exting.");
	}
}