How to Extend Thread Class

public class Threads1 extends Thread   
{
	public static void main(String args[])
	{
		Threads1 objThreads1 = new Threads1();
	}
	
	Threads1()
	{	
		start();
	}
	
	public void run()
	{
		System.out.println("Thread Started");
		
		for(int i=0;i<5;i++)
		{
			System.out.println(i);
			
			try 
			{
				Thread.sleep(1000);
			}
			catch (InterruptedException e) 
			{
				e.printStackTrace();
			}
		}
		
		System.out.println("Thread Completed");
	}
}