Step-by-Step: Using the Observer Pattern
1. Create two interfaces: Observable and Observer.
2. The Observable interface should contain the following methods:
- registerObserver() – registers Observers to receive updates
- removeObserver() – removes Observers from receive updates
- notifyObservers() – notify Observers of an updates using Push/Pull
- setChanged() – Optional, but let’s you control what updates should be sent
3. The Observer interface should contain the following method:
- update() – retrieves updated data from the Observable for Observers
jasonjkeller 