the static methods defined on TemporalQuery. Mrz 2012: G: Design Patterns für Programm: Allgemeine Java-Themen: 3: 16. observers is not specified. notifications on separate threads, or may guarantee that their Jun 2011: I: Wie populär ist Design by Contract in Java und was haltet ihr davon? Replaying Caching and Subjects. Tools Reference ; JShell User's Guide ; Javadoc Guide ; Language and Libraries. notifyObservers() method notifies observer about … arguments: this observable object and null. Allgemeine Java-Themen: 5: 11. This is the relation between the Observable and Observer classes.