public class MyThread extends Thread
{
   int threadID;

   // construtor
   MyThread (int ID)
   {
      threadID = ID;
   }

   // corpo da thread
   public void run ()
   {
      int i ;

      for (i = 0; i< 100 ; i++)
        System.out.println ("Hello from t" + threadID + "!") ;
   }

   // programa principal
   public static void main (String args[])
   {
      // cria três threads
      MyThread t1 = new MyThread (1);
      MyThread t2 = new MyThread (2);
      MyThread t3 = new MyThread (3);

      // inicia as três threads
      t1.start ();
      t2.start ();
      t3.start ();
   }
}