I have an application with enum, that's behaviour changes based on the value of the enumerated type, see http://java.sun.com/developer/JDCTechTips/2005/tt0208.html#2 for more detail. The problem that I see in this Design Pattern that client of the enum should decide what VisitorImpl should be ...

Hi all,I have a situation where I feel the need of combining Annotations and the Observer pattern. I would like to record field changes on an Object. So I decided to use the Observer pattern this way:class PersonObserver implements Observer{private List<String> changedFields = new ...

Hi Guys, Please help me out.I have a list sayL with N Array lists in that .and i need to loop thru all the values in that to print all combinations.L = { L1,L2,L3....N}L1={ 1,2,3,4,5}L2={aa,bb,cc,dd,ee}L3={10,20,30}I need to loop thru all the values and print all like a odometer.like1,aa,101,aa,20 ...

<p>I'm kinda new in all this.</p><p>could someone give me search tips on how to find a good tutorial on how to build games(not applets), mainly about animation and graphics. Or just point me to a good tutorial. thanks ahead.</p>

Hey!Sorry if this is posted in the wrong place, but I'm excited because I made my first game in Java. It's a rock paper scissors game and it's online atwww.geocities.com/glopv2The reason I made it is because I wanted to make a computer RPS machine that would detect patterns in your playing ...

Im stressing and havent had time to do my final project for this class can someone help.. thanksDesign a Java art program that will give an artist a great variety of capabilities to draw, use images and use animations to create a dynamic multimedia art displayif you can help that would be ...

<p>Hi,</p><p>I would like to know if this book is good:</p><p>"Design Patterns In Java" - Steven John Metsker William C. Wake.</p><p>Thank's</p><p>Yael</p>

The question:Design a small, prototype, application, which creates, stores and amends warehouse records. This may have little more than a StockItem class.Using each of the patterns Strategy, Decorator, Adaptor and in turn provide three different adaptations to your prototype application which will ...

YEY!!!BOO!!!Well, I'm storing an image as a blob in a mysql database... great!I can read out the bytes too... great!What I'd like some help with is how to write to a file in unicode-16 format.I'm trying to use OutputStreamWriter... But I dont know what I'm actually doing. I checked out the ...

I have a question regarding using interfaces, in particular for domain objects, and visbility regarding bidirectional associations.Let me explain the problem I am having using this exampleinterface INode {INode getParent;void addNode(INode node);}class Node implements INode {private INode ...

Does anyone have a simple example / explanation of drawing a texture using JOGL? I'm getting confused about what I find on the internet. There are examples that use com.sun.opengl.util.texture.Texture and bind, enable en disable it upon rendering (but this doesn't draw anything in my tests, but ...

As my previous question did not receive any answers, I'll try to rephrase it.I need to change the volume of sounds during the game (changing pitch would be nice too). I tried to use:double currentVolume, volumeGain=.01, newVolume;FloatControl gainControl = ...

Hi all,I am having some doubt in Transfer Object pattern.. How should we implement that pattern exactly? Lets take an example of displaying data from customer table. In my customerDAO iam creating an arraylist (containing records retrieved) and sending back to the presentation tier through ...

<p>I want to develop a drag and drop based IDE.</p><p>How should I proceed ? Should I go for an example to follow</p>

<p>Hi,</p><p>Can any of u tell me the limitations of factory pattern.</p>

I have architectural question. At server side we have .Net web service, at client side we have java desktop application.Issue is that we have an object (large object), let say ObjectA, on client side and its copy on server side. We get ObjectA by calling web service.Now we need these two object ...

Dear allI have recently joined a project that is 2/3 through development of a medium sized application providing synchronous and asynchronous implementations for a number of Use Cases exposed as Web Services. The design is one that I have not come across before and am keen to understand.Web Service ...

<p>For me, The Eclipse IDE is the best IDE out there...</p>

Hi,sometimes I have Code that looks like public boolean equals(final Object o) {if (o == null) {return false;}if (o == this) {return true;}if (!getClass().equals(o.getClass())) {return false;}if (this.getId() == 0) {return false;}final Link cObject = (Link) o;if (this.id != cObject.id) {return ...

Hello,I am maintening a client/server app (Swing client, no Web pages), basically an order processing system. The biggest part of it is to verify the conformity of orders to a set of business rules.As usual, some of the verification can be made early on the client-side, but most of the verification ...

Hi friends i have done a school management software it collects overall details of the students,exam,marks,report. i have done in java swings.now i need to convert this stand alone proj into nertworking ie windows based. Which concept i need to use how can i do this.by ...

<p>If you are going to implement the MVC pattern in a webapp, what is the best framework to use? </p><p>I've done a tutorial with Struts. Is that a good framework?</p><p>Is there any disadvantages by using such frameworks?</p>

Hello everybody!!I would like to ask if anyone knows about MATLAB. Does anyone? I am trying to build a programme for the flow-shop sequence problem, and I though as the problem is almost maths, the MATLAB could help me. If the question is yes, is it easy to use MATLAB? ...

Hi...Can any one explain me what is the differnce between Java patterns and J2EE patterns ?

Hey again people, i hope my questions aren't to tiring, and thank you originalsup3rman for answering my last question. I didn't want to revive the thread for fear of annoying some random person.On to the question.I was just wondering the best way to go about having a MouseListener and a ...

Hi, I was asked this in an interview.. 1) how would you a design a app. when database connection is lot. 2) will you have a database replica in another machine, so that if the connection is lost, take the data from the secondary database. I am not sure about this. But I strongly feel we never ...

Hi Everyone,Please help me how to develop a utility for comparining two text files and display the output in the browser as givenAddedModifiedRemovedThanks

Can any body have code to calculate ranks for a class of students whose marks are stored in a database. Finally after rank calculation we have to insert those ranks as per their login IDs..Please help me......

I need to find data on the distribution of cut blades of grass across the virtual lawn. Consider a 10 x 10 grid of un-cut blades of grass. The lawn mower traverses the grid and displaces the blades of grass. Now, I need to find some way to determine a good lawn mower route from a poor lawn ...

Hi Java Game DevelopersMe and a friend from work developed a game in Java. Its at www.spacemercenaries.comIf you want to play click on play sm, this will load the client applet. It will also ask you to confirm a certificate, this is because the applet uses sockets to connect to the server and ...

HelloI am new to rss feedsI have deployed the project TestRome and feedservlet is giving output in xml formatFor eg:<?xml version="1.0" encoding="UTF-8" ?>*-* < http://localhost:8090/TestRome/feed##> <rss xmlns:content="* http://purl.org/rss/1.0/modules/content/*" ...

I have recently been asked to develop a game for a company.It is a simple game, nothing special but I was wondering ifanyone who has independently sold a game (or anything you programmed) had ideas on how to price it.Any ideas would be ...

How would you implement a side scroller with tiles ?

Hi, I want to implement Role-Module wise security for the User. e.g. Admin can do everything in the site.High Profile users can Insert/Update/View all the modules.Medium Profile users can Insert/Update/View limited modules.Visitors can only view static pages. I hear about Role pattern but no ...

Dear all,I'm trying to create a singleton webservice. (a webservice of which only 1 instance is allowed. All calls to the webservice should 'end' in this singleton)Reason for this; the application uses a multithreaded back-end controlled by a ThreadPoolExecutor. This only has effect when ...

Hi All,I am trying to understand Factory Method pattern from HF- Design pattern. However i am unable to understand how Subclassing the PizzaStore is better than creating the invidiual region specific PizzaFactories.The author gives an example of SimpleFactory and then creates region specific ...

hi,is it possible to use the reverse of observer patterni.e - observer pattern is described normally as there is 1 subject & many observers.So when the subject changes, it notifies the observers. My problem is I only 1 observer but many things change, so when each of the things (subjects ) ...

Before I start work on a DB- I thought to execute code with JSP- Formbean- Action Servlet- Business Class- DAO flow. Is it possible to hardcode values and retrieve it from DAO? Pardon me if this sounds dumb question. Thanks,

Hi All, Currently I am in the process of evaluating different design ideas for the search functionality of my application. I am looking for a best option for retrieving the data by executing some complex sql queries with huge query criteria and showing the single or multiple records to the ...

Hi friends.I want use DAO for create a Swing application, that acess to PostgreSQL.I want to retrieve a list of objects ( for example: clients), How is the best implementation?Client[] clients = ClientDAO.getClients();or javax.sql.RowSet clients = ClientDAO.getClients();I'll use result ...

I have 2 DB's (sybase & oracle). I need to pull information from both of them and put it in another DB- table (may be oracle). I am planning to implement DAO and here is my problem:-1. ShouldI use 2 DAO's for two DB- tables? or just one is sufficient using a DAO factory?

I have 2 DB's (sybase & oracle). I need to pull information from both of them and put it in another DB- table (may be oracle). I am planning to implement DAO and here is my problem:-1. ShouldI use 2 DAO's for two DB- tables? or just one is sufficient using a DAO factory?

*This topic was posted a while ago in "java programming" section but was suggested to try hereHi everyone,A couple of days ago I posted a topic on analyzing structure similarity between two web pages. After some researching, I know I need to work out some tree matching algorithms: tree edit ...

I wrote this script for finding superset of a set but it has limitations in the number of elements it can find for 19 elements after this it crashes memory heap limitation any other way to solve this problem is there any standard (or known) algorithms that resolves this problem NOTE: in TOPIC ...

Random r=new Random(); int pointNode1=r.nextInt(component1.size()); int pointNode2=r.nextInt(component2.size()); if(action=="Reprod"){//do Reproduction or Crossover System.out.println("--"); System.out.println("pointNode1:"+pointNode1); System.out.println("pointNode2:"+pointNode2); ...

Hello, I have 2 classes. Address & User. The relationship is Address belongs to User (& is a 1-1 in my case). As such I have an Address reference in my User class.Class User { Address addr; ...}Under what circumstances should I also include a reference to User within Address ?Class ...

Hey all! Alright, well i belive that the title of this describes what i'm basically looking for. Anyway, i'm writing a simple skateboarding game, and i need a steady framerate. I've tried multiple ways of keeping a steady framerate... all of which failed (obviously) which is why i'm here! ...

Hi,Can You advice me any 2D toolkit that will help me to create board and card games? The desireable features are:- On top of Java2D (OpenGL is less desireable)- Support for structures like sprites, layers, scenes- Operates with 2D geometry- Fast enoughI found Piccolo toolkit ...

Hi all,I've been reading about the Proxy Pattern and it seems like just normal encapsulation to me or do I misunderstand it?To me, Proxy looks like using a "middleman" class to delegate requests to the actual class so that the implementation of the actual class is hidden from the user.Another ...

WOW.Well, its not REALLY pong thus it is hard... So, take the classic pong game but change the shape of the paddle to lets say any polygon... When a ball hits any side of this polygon it should bounce off with the same angle as the incident angle but in the opposite dierection... Ok... So, how ...