choubix alex

thanks for your input.
I still have to cover a lot of ground before I can develop a client that is "half correctly" baked ;)

Hi David,

For instance:

Software: Swing Client/Server/Database

User A is using the Swing Client, opens a Customer's file to update some info in the database (new email address and telephone number for instance)
User B opens the same Customer file to see info around the same time as he needs to call the customer and needs the phone number.

I believe User B will not see the changes in the Customer's profile unless he restarts his client? Am I right?

if so: is there a way to lock the document (Customer's file in that case) while User A is updating, let User B know that User A is working on this document, release the document when User A is done?

hello,

I am a bit intrigued by how java handles users and documents.
so I would have 2 questions:

Q1:
let's say that:
user A opens Document 1.
user B also open Document 1.

-> isn't there any conflict here ?

(for instance, the changes made by user A would be "erased" by user B without user B being able to see the modifications made by user A)

Q2:
also:
if user A creates document and saves it, does user B have to close and reopen his java client to see the document created by user A?

thanks!

Hello and thanks for your reply. I was posting here as I am a beginner.

I was thinking about :

H2 database
OpenJPA
Jetty / Tomcat webserver
and a Swing client

but since I am new to Java I would need some guidance (or some good references/books that I can buy to study)

Hello!

I'd like to start coding next week but I am struggling with the architecture...

Does anyone knows of a good book (or any other good resource) that would allow me to build up the skills/understanding necessary to code a 'basic' client/server application?

I'd really like to be able to have a remotely accessible application with a front end using either a browser or swing and connecting to a server where the H2 database will be installed (connection through internet & intranet since we'll be using laptop when traveling and desktop in the office).

I suppose it is quite an ambitious project but I am confident I'll be up to the tasks

Thanks!

Thanks again!

I've stumble on MiG shortly after posting my message and I have managed to position my labels in a much better way.
I was tempted to use a Visual builder (netbeans provides one I think) but I have decided to start coding my UI instead so that I can learn better/more.

hello,

I am learning the basics of Swing / Substance look and feel.
I'd like to add some icons to my Jbuttons. (load, save, delete...)

I came across the graphic library (from java.sun.com). it comes a Jar file that contains gif files.
I've built a class path for the Jar and it is now in the "reference library" folder.

but when I try to do "import thenameofmyjar.*;" where my code is it returns an error.

basically: I know how to import the jar in my project as a reference but I don't know how to make use of it

can someone tell me how to do please?

by the way: if I download a pack of gif from the web for my interface. how would I link these gif files to my project? (do I need to create a jar file for them? if so: is there a tutorial for that? do I need to put them in a folder and reference them manually?)

thanks!

Hi!

I am creating a login screen to get up to speed with Swing.
When I run the following code all the elements are displayed BUT their position on the screen is not correct.
is it possible to display the elements like this

username: (textfield here)
password: (passwordfield here)
comment: (comment field here)

etcetc

while aligning them so it looks nice? (all the labels / fields aligned)

thank you for your time

ps: please feel free to comment my code on my code as this is new for me and that I would like to progress fast


code:

package com.mywebsite.www.ui; import javax.swing.*; import org.jvnet.substance.skin.SubstanceBusinessLookAndFeel; public class LoginForm extends JFrame{ //Create Labels JLabel usernameLabel = new JLabel("username: "); JLabel passwordLabel = new JLabel("password: "); JLabel commentsLabel = new JLabel("comment:"); //Create fields JTextField username = new JTextField(20); JPasswordField password = new JPasswordField(20); JTextArea comments = new JTextArea(5,15); JScrollPane scroll = new JScrollPane(comments, //Create a Vertical Scroll for the comments ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); JButton login = new JButton("Login"); //Create the Frame, set size, add all elements and display public LoginForm() { super("Login Form"); this.setSize(300,300); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel pane = new JPanel(); pane.add(usernameLabel); pane.add(username); pane.add(passwordLabel); pane.add(password); pane.add(commentsLabel); pane.add(scroll); pane.add(login); //setContentPane(pane); //Similar to add(pane); add(pane); setVisible(true); } public static void main(String[] args) { JFrame.setDefaultLookAndFeelDecorated(true); SwingUtilities.invokeLater(new Runnable() { public void run() { try { UIManager.setLookAndFeel(new SubstanceBusinessLookAndFeel()); } catch (Exception e) { System.out.println("Look and Feel failed to initialize"); } LoginForm L = new LoginForm(); //loginForm.setVisible(true); } }); } }

Thank you Maneesh,

it works now!

hello everybody

I've just joined the bandwagon and I am learning java
Not having a strong IT background I've read 2 books so far
I am quite thrilled at the idea of developing my first UI.


I stumble on Substance which looks very cool and I'd like to use it.
however I dont really understand how to make it work in Eclipse. (the instructions on the website are for more "advanced" developers )

has anyone tried to setup substance in Eclipse before and can help me with it please?

thanks!

well, right now I am at the "embryonic stage" hahaha ;)

but you are right: I've read that the use of Setters/Getters is not fully "OO" compliant. Nevertheless I am really trying to get things to work at the moment.

next on my list is to :
- have a clear roadmap of what I want to develop in terms of functionalities and look/feel (java, swing + webstart / JavaFX)
- get hold of JDBC

Then I will certainly have to design an "infrastructure" for what I want to achieve and finally work on the performance and scalability of the application
(I suppose that means using: Maven 2, Subversion, Hudson, Jira -as hopefully I'll get someone on board late next year and that implementing all these tools would help working with someone else!)

And I am not mentioning the various packages that I will undoubtedly stumble upon when looking for reporting capabilities, charting etcetc...

hello,

I've understood how to display decimals and change strings to upper/lower case (so many online resources on Java!)

I was wondering what should be best in the following code where I convert a string to:
1st character: upper string, subsequent characters, lower case. (line 25, first block of code)

the code is quite lengthy...

instead of calling "myaccount.GetAnyVariableNameHere" in the out.println(), shall I create a variable and call it ?
if so: should the name be the same as in the setter/getter or different?

thanks!


import static java.lang.System.out; import java.text.DecimalFormat; public class UseAccount { public static void main(String[] args) { // TODO Auto-generated method stub Account myAccount = new Account(); //DecimalFormat money = new DecimalFormat("$0.00"); DecimalFormat money = new DecimalFormat("'$' #,###.##"); myAccount.setFirstName("John"); myAccount.setLastName("doe"); myAccount.setAddress("21a white house Avenue"); myAccount.setBalance(200000000.5250); //Lower Case out.println(myAccount.getFirstName().toLowerCase()); //Upper case for the 1st character of the String out.println(myAccount.getLastName().substring(0,1).toUpperCase() +myAccount.getLastName().substring(1)); //Upper case the whole string out.println(myAccount.getAddress().toUpperCase()); // shows getBalance with $ sign first and 2 decimals // uses static import java.text.DecimalFormat // requires declaration: DecimalFormat new_variable = new DecimalFormat("$0.00"); // output needs: new_variable.format(getter); out.println(money.format(myAccount.getBalance())); //show getBalance on screen, no decimals //out.printf("%.0f", myAccount.getBalance()); } }

and


public class Account { /** * @param args */ private String firstName; private String lastName; private String address; private double balance; public void setFirstName(String name1) { firstName = name1; } public String getFirstName(){ return firstName; } public void setLastName(String name2) { lastName = name2; } public String getLastName(){ return lastName; } public void setAddress(String address1) { address = address1; } public String getAddress(){ return address; } public void setBalance(double balance1){ balance = balance1; } public double getBalance(){ return balance; } }

Hi!


Fred, Joe, Mark, Marco: thank you so much for spending of your time writing detailed answers.
I don't know yet if I'll be using multithreading (beginner with only 3 days of Java under my belt! ;) )
maybe it will be useful for what I intend to do but I have not yet reached that stage hehehe ;)

I dont foresen the company hiring programmers in the short term but I understand your point with the setters/getters.
Controlling the data stored in the variables is crucial (it can be quite messy if the code is not explicit! it's already quite difficult after a few days away from the office and when the code is not commented properly...) and can prevent users from storing something that shouldnt be there.

hi there,

I've come to the point where, in the 2 books I am using right now, the authors are mentioning the getters and setters as a way to "enforce" control over the variables. It doesnt quite make sense to me... the couple of examples I foudn online do not make much sense either...

can someone shed some light on this for me please?

basically: why would I NOT want to interact directly with the variables I have created in a class? it seesm more "natural" to me to use them directly...

and : is the use of constructors and getters/setters mutually exclusive? (it seems quite difficult to me to combine both at the same time even though the purpose is different)

thanks!

I think I have partially cornered the problem: I was a bit blur on how to use a 2D array properly in java.

for instance:

int[][] multiDollar = new int[1][dollarEarned2.length];

would mean that multiDollar has 2 rows and 3 columns (because dollarEarned2.length = 3).
and each row represents an array and each column represents the position within the array.


Still I have a problem understanding how to store correctly dollarEarned[] and DollarEarned2[] in multiDollar[][]
I've been trying using 2 "for" loops but with no success.

basically I am trying to get this (using loops to store):

multiDollar[0][0] = 100
multiDollar[0][1] = 200
multiDollar[0][2] = 350
multiDollar[1][0] = 2000
multiDollar[1][1] = 4000
multiDollar[1][2] = 5500


have someone a chunk of code lying around that would show how to store 2 arrays in a 2D array using doulbe nested loops please?
thanks!