889: Mainline

So that the run method in the MarqueeThread class has access to the appropriate instance of the Marquee class, that instance of the Marquee class is provided to the thread via the thread's constructor, and is held by the marquee instance variable.

Then, with the Marquee instance available as the value of the marquee instance variable, the run method is readily defined to call decrementPosition periodically.

public class MarqueeThread extends Thread { 
 private Marquee marquee;                     
 public MarqueeThread (Marquee c) {                
   marquee = c;                                           
 }                                                       
 public void run () { 
  while (true) { 
   // Call to decrementPosition 
   try{sleep(200);}                              
   catch (InterruptedException e) {}      
  } 
 } 
}