Implementing The Observer Pattern In Java



The following examples shows you how to manually implement the Observer pattern in Java.

Since the interface is public, it has to be described in it’s own file.


The Java framework provides the java.lang.Observer and java.lang.Observable classes to standardise the way the observer pattern is implemented.

The problem is you can attach any Observer object to any Observable object, creating potential incorrect-type issues, especially when a project starts to grow in size.

Posted: June 15th, 2016 at 2:52 pm
Last Updated on: June 15th, 2016 at 5:47 pm