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Login without multiple windows

I'm using Windows builder for create an application in Java. I create a frame with the login interface. What i want is that if the user insert correct information he will write something.
I don't want to open another JFrame I would like that the Login frame will be substitute with another one in order to have only one windows.
Could you tell me the correct object that I must use?

The best options are using either a JOptionPane or a JDialog
JOptionPane works as a message box, and can be customized to your linking and usage. For example, if what you wanna show is a sucessfully logged in message, you could use:
JOptionPane.ShowMessageDialog(null, "Logged in sucessfully", "Logged in", JOptionPane.INFORMATION_MESSAGE);
You can find out about each parameter here. It's a pretty complete documentation of the JOptionPane.
JDialog is another time of window used by Window Builder, and is works as a window that cannot be switched, a classic modal dialog. While this screen is in usage you cannot acess others (as your JFrame), unless you command it to close. And to use this you can simply create it as you would with your Frame. It's modality is set by default.
From what I get of your message the first option would be the best alternative, but that decision's up to you.
I highly recommend you to look into some Window Builder documentation before you'd resort to Stack Overflow. This would be helpfull, it explains everything you need to know about the usage of Window Builder's windows and it's funcionalities.

you can close your current frame by using the command
this.dispose();
this will just close your current window. Just make sure you open the other window too.
JFrame frame = new [yourClassname]();
that should work just fine :)

JAVA - How do I make the user be able to utilize only the frame on top?

When two JFrames are enabled, I want the user to be able to use only one in the top (think of that like an error pop up on your screen, when you can't press anything but the popup itself). I am aware of the class JInternalFrame and I chose not to use it for my program. Thanks in advance :)

Use JDialog, you can set your main frame as the JDialog's parent frame, so that whenever your main frame and JDialog will display, you will be able to click only the JDialog, not your main frame.

You want a modal behaviour, then. I think you can try using JDialog instead of JFrame, something like:
JDialog dialog = new JDialog(parentFrame, title, true); //parameters: owner, title and modal
dialog.getContentPane().add(somePanel);
dialog.pack();
dialog.setVisible(true);
You can read more about it here: http://docs.oracle.com/javase/tutorial/uiswing/misc/modality.html

i have displayed a JDialog using JOptionPane.showOptionDialog , can someone tell me how to set it inVisible or Dispose it?

i have displyed this JDialog , and have passed an Object which is a JPanel on it , thus my JDialog displays my JPanel on it when Invoked as required.
and on this JPanel I have a JButton, on pressing i want some operations to happen which i have written in it's ActionListener and in the end i have to dispose that JDialog, but i have no clue how to do it !!
This s my JDialog Statement and help me with HOW TO EVEN REMOVE AN ICON from JDialog as even after keeping the ICON PARAMETER NULL it displays the ICON.
JOptionPane.showOptionDialog(null, "SELECT ITEM AND THEN EDIT THE DETAILS.",
"EDIT ITEM DETAILS", int1, int2 , null, objEditMorePane, null);

It sounds like you want to make it a JOptionPane.PLAIN_MESSAGE. That is what you need to put instead of whatever int2 is. I was going to link you to the tutorial but Space Pope already did that. You don't need to create a custom dialog to change the default icon, just change the message type to a plain message. The tutorial covers all this stuff.

You'll need to keep a reference to the dialog if you want to close it yourself. See the Oracle tutorial on custom Dialogs. The constructor you're using also puts in an icon by default; if you make your own dialog, you can control that part too.

JOptionPane closes its dialog when its value property changes. So, you can obtain the parent JOptionPane and set its value to close the window:
JOptionPane optionPane = (JOptionPane)
SwingUtilities.getAncestorOfClass(JOptionPane.class, button);
optionPane.setValue(JOptionPane.CLOSED_OPTION);
If the window wasn't created by JOptionPane, you can use the getTopLevelAncestor method of JComponent to obtain the parent window:
Window window = (Window) button.getTopLevelAncestor();
window.dispose();

How to get JOptionPane with three text fields

I want to know how i can do a messageBox from three input dialog ..
Like this:
JOptionPane.showInputMessageDialog("Enter your FirstName");
JOptionPane.showInputMessageDialog("Enter your MiddleName");
JOptionPane.showInputMessageDialog("Enter your LastName");
But I want one message has a three input boxes.

Build a JPanel (supose it's named inputPanel) with the three JtextFields to input and then do this:
if (JOptionPane.YES_OPTION == JOptionPane.showconfirmDialog(
parentComponent, inputPanel, "Enter your data", JOptionPane.YES_NO_OPTION) {
// retrieve data from the JTextFields and do things
} else {
// User close the dialog, do things... or not
}

You can't do that with JOptionPane. Create a JDialog and add three JTextField's to it instead. A JDialog will block the caller when you call setVisible(true), so it's easy to create a dialog that waits for user input before it returns.

showInputMessageDialog and its brethren are simple ways to whip up a simple "standard" dialog. For more complicated dialogs, I'm pretty sure you'll have to subclass JDialog or such.

As Telcontar has suggested you can add Swing components (like a JPanel) to an option pane. So it is easy to take advantage of the automatic creation of buttons rather than do it from scratch by building your own JDialog.
However, there is one small problem. The focus will be on the first button, not on the first component of your panel. To get around this problem you can try the solution presented in Dialog Focus.

You can find the standard Java Tutorial Example here:
Click Here to Open the example java file
The example has only one text box, but the example is clear enough for you to extend it.

How do I get "Goodbye Window" to show up in Java?

I have a Java network application and this is what I want to do:
After user logs out, his interface window closes.
Now, I want for another window to show up that will say something like: "Thank you for using our application".
This final window should be borderless and without any available option, more like a plain picture (jpeg? why not?). By clicking on it, user will be sure to close this final window.
I googled and couldn't fin anything on this matter, it's hard to phrase the question.
I hope someone helps me...

https://docs.oracle.com/javase/1.5.0/docs/api/javax/swing/JWindow.html
A JWindow is a borderless, undecorated JFrame (no titlebar or buttons).
This should be what you need.

This should help:
http://java.sun.com/docs/books/tutorial/uiswing/events/windowlistener.html
You're interested in the windowClosing and windowClosed events

You have various possibilities, depending on when you want this dialog to display :
if you want it to display juste before the app closes, use addShutdownHook
if you want it to display when the last window closes, use addWindowListener
You can then use a JWindow with your image inside, and use addMouseListener to wait for the user to click on it.