- Alert per errori
JOptionPane.showMessageDialog(null, "Messaggio");- Logo
label.setIcon(new ImageIcon("http://3em.it/website/images/Home/3em_Logo_SMALL.png")); - Colore testo
label.setForeground(Color.RED) - Icona
ImageIcon img = new ImageIcon(pathToFileOnDisk);
frame.setIconImage(img.getImage());