The name of the design pattern is Observer. The intent of this design pattern is to provide a loose coupling between an observable subject and one or more observers . A subject notifies it observers whenever its (the subject’s) state changes.
Read moreWhen should you use Observer pattern?
Use the Observer pattern when changes to the state of one object may require changing other objects , and the actual set of objects is unknown beforehand or changes dynamically. You can often experience this problem when working with classes of the graphical user interface.
Read moreHow are observer and observable used?
The observer pattern in java is known for its use in design. Whenever an observable object changes its state, its corresponding observer classes are notified . Observable is implemented as a class which includes methods for managing Observer lists and notifying Observers.
Read moreWhy do we use observable in Java?
Observable is used to create subclasses that other parts of the program can observe . When an object of such subclass undergoes a change, observing classes are notified. The update( ) method is called when an observer is notified of a change.
Read moreWhat is an observer method?
The observer method is a Behavioral design Pattern which allows you to define or create a subscription mechanism to send the notification to the multiple objects about any new event that happens to the object that they are observing . The subject is basically observed by multiple objects.
Read moreWhat is the purpose of using an observer?
The responsibility of observers is to register (and unregister) themselves on a subject (to get notified of state changes) and to update their state (synchronize their state with the subject’s state) when they are notified.
Read more