787: Highlights

• If you want to build a GUI, then adopt the model–view approach.
• If you want your program to react to model changes, then
  • Arrange for the model class to extend the Observable class.
  • Insert calls to setChanged and notifyObservers in the setters of the model.
  • Define an observer class that implements the Observer interface.
  • Define an update method in the observer class such that update fetches information from the model and relays that information to a view.
  • Connect an observer to the model using addObserver.
• If you want your program to react to view events, then
  • Define a listener class that implements an appropriate listener interface.
  • Define listener methods as dictated by the listener interface such that those methods fetch information from the view and relay that information to a model.
  • Connect the listener to the appropriate component.