private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        startCountdown();
    }                                        
    
    
    public void startCountdown() {
        SwingUtilities.invokeLater(new Runnable() {  //Note 1
            public void run() {
                
                for ( int i = 0; i < 2000; i++ ) {
                    System.out.println( i );
                    try {
                        wait(100);
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                    
                }
                
                
            }
        });
        
    }