Skip to Main Content
Java Design Patterns: A Hands-On Experience with Real-World Examples
book

Java Design Patterns: A Hands-On Experience with Real-World Examples

by Vaskaran Sarcar
December 2018
Intermediate to advanced content levelIntermediate to advanced
512 pages
8h 51m
English
Apress
Content preview from Java Design Patterns: A Hands-On Experience with Real-World Examples
© Vaskaran Sarcar 2019
Vaskaran SarcarJava Design Patternshttps://doi.org/10.1007/978-1-4842-4078-6_14

14. Observer Pattern

Vaskaran Sarcar1 
(1)
Bangalore, Karnataka, India
 

This chapter covers the observer pattern.

GoF Definition

Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.

Concept

In this pattern, there are many observers (objects) that are observing a particular subject (also an object). Observers register themselves to a subject to get a notification when there is a change made inside that subject. When they lose interest of the subject, they simply unregister from the subject. It is also referred to as the publish-subscribe pattern . The whole idea ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Java Design Patterns: A Hands-On Experience with Real-World Examples

Java Design Patterns: A Hands-On Experience with Real-World Examples

Vaskaran Sarcar
Spring Microservices in Action, Second Edition

Spring Microservices in Action, Second Edition

John Carnell, Illary Huaylupo Sanchez
Java Concurrency in Practice

Java Concurrency in Practice

Brian Goetz, Tim Peierls, Joshua Bloch, Joseph Bowbeer, David Holmes, Doug Lea

Publisher Resources

ISBN: 9781484240786Purchase LinkPublisher Website