public class ThreadMain
{
    public static void main(String[] args)
    {
        Thread1 t1 = new Thread1();
        t1.start();
        System.out.println("I'm from threadMain");
        System.out.println("wait for 5 seconds");
        try
        {
            Thread.sleep(5000);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        System.out.println("threadMain comes back");
    }
}

public class Thread1 extends Thread
{
    public void run()
    {
        System.out.println("I'm from thread1");
    }
}