How are Observer and Observable used?

✍: Guest

Objects that subclass the Observable class maintain a list of observers. When an Observable object is updated, it invokes the update() method of each of its observers to notify the observers that it has changed state. The Observer interface is implemented by objects that observe Observable objects.

2012-05-31, 2910👍, 0💬

Popular Posts:

what is a service co...

what is a service contract, operation contract and Data Contract? - part 1 In the below sample we ha...

How Is the Width a P...

How Is the Width a Parent Element Related to Child Elements? - CSS Tutorials - Understanding Multipl...

How To Define a Sub ...

How To Define a Sub Function? - Oracle DBA FAQ - Creating Your Own PL/SQL Procedures and Functions A...

The object that cont...

The object that contains all the properties and methods for every ASP.NET page, that is built is .. ...

Function Calls...

What will be printed as the result of the operation below: #define swap(a,b) a=a+b;b=a-b;a=a-b; void...