private boolean isDay() { int iHour = (new GregorianCalendar()).get(Calendar.HOUR_OF_DAY); return iHour >= 8 && iHour < 20;}private Image getImage(Component c) { Toolkit tk = c.getToolkit(); Image img1 = tk.getImage("c:\\1.jpg"); Image img2 = tk.getImage("c:\\2.jpg"); return (isDay())? img1: img2;}