public interface Observer
Observe
interface defines the notification API through which interested observers are notified of subject changes. In general, classes that are interested in being notified of state changes in subjects they reference should implement the Observer
interface.UpdateMessage
Modifier and Type | Method and Description |
---|---|
void |
update(java.lang.Object observed, UpdateMessage change)
Notification message.
|
void update(java.lang.Object observed, UpdateMessage change)
observed
- the subject whose state has changed.change
- what has changed.