javautilObservable
The java.util.Observable class was a fundamental part of Java's observer pattern implementation before its deprecation. It provided a mechanism for objects to notify other objects when their state changed. An Observable object maintained a list of observers and would notify them by calling their update() method. The update() method typically received a reference to the Observable object that triggered the notification.
To use Observable, a class would extend it. Then, other classes, designated as observers, would implement the
While Observable was widely used, it had certain limitations. It was not thread-safe, requiring developers to