//Adapted from Arnold and Gosling


public class PingPong extends Thread {
   private String word; // what word to print
   private int delay;   // how long to pause
   
   public PingPong (String whatToSay, int delayTime) {
      word = whatToSay;
      delay = delayTime;
   }

   public void run() {
      try {
         while (true) {
            System.out.print(word + " ");
            sleep(delay); // wait until next time
         }
      } catch (InterruptedException e) {
         return;          // end this thread
      }
   }

   public static void main(String[] args) {
      new PingPong("ping", 33).start(); // 1/30 sec
      new PingPong("PONG", 100).start(); // 1/10 sec
   }   
}