... JLabel(" ;Serial Ports& quot;, JLabel.RIGHT)); serialPortsChoice = new JComboBox(); centerPanel.add(serialPortsChoice); serialPortsChoice.setEnabled(false); centerPanel.add(new JLabel(" ;Parallel Ports& quot;, ... supports both serial (RS232/434, COM, or tty) and parallel (printer, LPT) ports. We’ll cover this in more detail later, but briefly, serial ports are used for modems and occasionally printers, and ... selectedPortIdentifier; /** The JComboBox for serial ports */ protected JComboBox serialPortsChoice; /** The JComboBox for parallel ports */ protected JComboBox parallelPortsChoice; /** The JComboBox for...