Java How to Program Fourth Edition - DCC

Appendix G Elevator Events and Listener Interfaces (on CD) 1391
1 // ElevatorModelListener.java
2 // Listener for ElevatorView from ElevatorModel
3 package com.deitel.jhtp4.elevator.event;
4
5 // ElevatorModelListener inherits all Listener interfaces
6 public interface ElevatorModelListener extends BellListener,
7 ButtonListener, DoorListener, ElevatorMoveListener,
8 LightListener, PersonMoveListener {
9 }
Fig. Fig. G.14 G.14 G.14 Interface ElevatorModelListener allows the model to send all
events to the view.
G.4 Component Diagrams Revisited
In Section 13.17, we introduced the component diagram for the elevator simulation. In our
simulation, the ElevatorView and every object in the model import package event.
Figure G.15 presents the component diagram for package event. Each component in
package event maps to a class from Fig. G.1–Fig. G.14. According to the component diagram,
ElevatorView.java of package view aggregates package event. In Java,
this aggregation translates to class ElevatorView importing package event. Also according
to Fig. G.15, package model aggregates package event—i.e., each component
in package model contains an aggregation with all components in pacckage event. (We
show all components of package model in a separate component diagram in Appendix H.)
In Java, this aggregation translates to each class in package model that imports ‘package
event.
This concludes the appendix on the events and listener interfaces of the elevator simulation.
We hope you have found it a useful reference for the material on event handling
discussed in “Thinking About Objects” Section 10.22. In the next two appendices, we
implement the design for the model and the view, and we provide the component diagrams
for packages model and view.