Design Patterns Java™ Workbook

Mediator (Chapter 10)

SOLUTION 10.1

Figure B.12 shows a solution. The arrowheads in the link between PlaceA-Tub and PlaceATubMediator emphasize two-way navigability between these classes. A PlaceATub object has a mediator that it registers for events: public JTextField textField() { if (textField == null) { textField = new JTextField(); textField.setFont(font()); textField.addActionListener(mediator()); textField.addFocusListener(mediator()); } return textField; } Figure B.12. The PlaceATub class handles component building, and the PlaceATubMediator class handles events. The constructor for PlaceATubMediator accepts a PlaceATub object to which ...