public void startCountdown(){
        
        for ( i = 5; i > 0; i-- ) {
            System.out.println( i );
            
            
            SwingUtilities.invokeLater(new Runnable() {  //Note 1
                public void run() {
                    jLabel1.setText(Integer.toString(i));
                }
            });
            
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
            
            
        }// end for loop
        
        
    }