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public class PingPong extends Thread  // save as PingPong.java
  {
    private String word;
    private int delay;
    public PingPong( String parole, int pendant )
      {word = parole; delay = pendant; }
    public void run()
      { try { for (;;)
                { System.out.print(word + " ");
                  sleep(delay);
                }
            }
        catch(InterruptedException e)
            { return; }
      }
  }

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public class Argue   // save as Argue.java
  {
    public static void main( String [] args )
      {
        new PingPong( "ping",  333 ).start();
        new PingPong( "PONG", 1000 ).start();
      }
  }

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