import java.lang.*;
public class MarqueeThread extends Thread {
 MarqueeCanvas canvas;                    
 MarqueeThread (MarqueeCanvas p) {               
   canvas = p;                           
 }                                      
 public void run () {
  while (true) {
   canvas.decrementPosition();
   try{sleep(200);}                                     
   catch (InterruptedException e) {stop();}             
  }
 }
}