[observer] Forum Topics

HI guys, as I was playing with observers today I came across something interesting. I have a program which keeps a list of users (Observers) and products (Observables) and the idea is that whenever the availability (that's a property of a product) changes the Observers are notified of this change. …

hi guys, I've come across observers while working ona very very large project, and I didn't quite understand how they were structured and I suppose this had something to do with the huge size of the project itself. Anyway, I then decided to delve a little more into that, I …

Hi, I'm working on my assignment there are two parts of the assignment first part was to create class (ClassOne,ClassTwo,ClassThree,ClassFour,ClassFive) ClassFive extends ClassTwo and ClassTwo is abstract the secod part is to add the iobserver and iSubject , but I don't know how to implemet this part in the UML …

Hi I have a scenario that i need to implement. the scenario is below. I have a class handler and a class Healthmonitor. every 10 seconds i have to send a msg to HealthMonitor to update a variable. in one point if it didnt send a msg in a multiple …

The problem with my code is that the update method doesn't get invoked even after I notify the observers. Did I miss something in my code? package com.observer3; import java.awt.FlowLayout; import java.util.Observable; import java.util.Observer; import javax.swing.JLabel; import javax.swing.JPanel; public class A extends JPanel implements Observer{ JLabel lbl; public A(){ setLayout(new …

HI Part 1: I have 4 classes Handler, ResultE, QueryE and the HealthMonitor. The Handler, ResultE, QueryE classes have to send a message every 1 min (for example, the time is defined in each class) to the HealthMonitor. So i implemented the Observer patter. The Handler, ResultE, QueryE as Subjects …

HI, how do i draw the observer pattern in a component diagram? appreciate if someone could point me to a link thanks,

Hello, I have a observer pattern based JTable. With time it is poulated with new data packets. I use addRow functionalities to add my rows. But I want to put always the last coming datapackets at the top. How to do it??

Hi there, I have been studying he Observer pattern among other design patterns, and I am having difficulty understanding how it works. I have read the design patterns book by Head First where applicable and researched it like crazy on the internet. I was wondering if anyone can point out …