public class ThreadExemple1Bis extends Thread {

  private Exemple1Bis ex1 ;

  public ThreadExemple1Bis(Exemple1Bis e) {
    ex1 = e ;
    }

  public void run() {
    while ( true ) {
      try {
        sleep(50) ; }
      catch(Exception e) {} ;
      ex1.repaint() ; }
    }
  }