public class ThreadDemo
{
    public static void main(String [] args)
    {
        new TestThread().start();
        while(true)
        {
           System.out.println("main thread is running");
        }
    }
}
class TestThread extends Thread
{
   public void run()
   {  
      while(true)
      {
          System.out.println(Thread.currentThread().getName()+" is running");
      }
   }
}