Thread: hi awl

i m students
i hope i will get here guidance frm experts.

sme error in dis programme


class NewThread extends Thread
{
NewThread()
{
super("demo thread:");
System.out.println("child Thread:"+this);
start();
}

public void van()
{
try
{
for(int i=5;i>0;i--)
{
System.out.println("child Thread:"+i);
Thread.sleep(500);
}
}

catch(InterruptedException e)
{
System.out.println("child Thread");
}
System.out.println("exiting child");
}
}

 
class NewThread extends Thread1
{
	NewThread()
	{
		super("demo thread:");
		System.out.println("child Thread:"+this);
		start();
	}
 
	public void van()
	{
		try
		{
			for(int i=5;i>0;i--)
			{
				System.out.println("child Thread:"+i);
				Thread.sleep(500);
			}
		}
 
		catch(InterruptedException e)
		{
			System.out.println("child Thread");
		}
		System.out.println("exiting child");
	}
}
 
class Three
{
	public static void main(String str[])
	{
		new Thread();
		try
		{
			for (int i=5;i>0;i--)
			{
				System.out.println("main Thread:"+i);
				Thread.sleep(1000);
			}
		}
		catch(interruptedException e)
		{
			System.out.println("main Thread......");
		}
		System.out.println("exiting Thread");
	}
}