Develop Reference

Internalframe size is not always maximized ( alternating)

I am facing a weird issue that I can't see to understand why. I have a frame with an Internal JFrame that opens upon a menu click. This internal frame is supposed to be always maximized. When I run the program and click on the menu then it does what is expected. If I close the internal jframe and click the button again, the internal jframe is minimized. If I close it and click the button then it is maximimzed!! Why is it alternating like that. Here is the code that open the internal jframe. This method is inside the JFrame class
private void onButtonClick(){
InternalFrameProp intFrame = new InternalFrameProp ();
intFrame.setVisible(true);
jDesktopPane1.add(intFrame );
try {
intFrame .setMaximum(true);
} catch (PropertyVetoException ex) {
Logger.getLogger(MainHomePage.class.getName()).log(Level.SEVERE, null, ex);
}
}

As I was trying to put a runnable example, I noticed that this behaviour only happen in the Windows look and feel. To get around I did
jDesktopPane1.setDesktopManager(new DefaultDesktopManager());
That seemed to fix the problem! I have no idea why but it worked!

How do you add a jFrame to your main class in Netbeans?

So I have made a Jframe with a lot of elements and buttons and things in it, but I am new to using NetBeans. Upon creating the java application a main class.java was created and upon adding the jframe another jframe.java was created. How do I get the main class to open, read, and run my jframe.java? I can upload the specific code if need be.
Thanks in advance

To call a certain method from another class, you must first create a new object for that class, like this:
Jframe frame = new Jframe();
frame.setVisible(true); //or whatever the method is in jframe.class
Maybe rename the actual class name from jframe to something like frameone. I've heard that naming classes the same as classes in the Java API will cause trouble.
Or, you could put it all in one class, with either two separate methods or put it all in the main method. If this doesn't help, then please paste the exact code on pastebin.org and give a link.

Look at this sample example and learn how to set frame visible
import java.awt.*;
import javax.swing.*;
public class exp{
public static void main(String args[]){
JFrame jf=new JFrame("This is JFrame");
JPanel h=new JPanel();
h.setSize(100,100);
h.add(new JButton("Button"));
h.add(new JLabel("this is JLabel"));
h.setBackground(Color.RED);
jf.add(h);
jf.pack();
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setVisible(true);
}
}
Useful Links
Designing a Swing GUI in NetBeans IDE
Creating a GUI With Swing (As #MadProgrammer Commented)
Learning Swing with the NetBeans IDE

I'm new to this, but I got a form up. Woo hoo!
1) The project created my main function in japp1.java
2) I created a JFrame, file jfMain.java
3) While there was probably a way to reference it as it was, I didn't see how right away, so I moved it to a peer level with the japp1 file, both in a folder called japp1 which will cause them to get built together, having the same parent reference available.
src\
japp1\
japp1.java
jfMain.java
4) Then instead of creating a generic JFrame with a title, I created an instance of my class...
5) I gave it a size...
7) Then showed it...
public static void main(String[] args) {
// TODO code application logic here
JFrame frame = new japp1.jfMain();
frame.setPreferredSize(new Dimension(700, 500));
frame.pack();
frame.setVisible(true);
}
I had already put some code in my jframe... to show a messagedialog with JOptionPane from a mouseclick event on a button and set some text for some textfields.
Hope that helps.

Making a custom icon for a JFrame

Well I was wondering if I could make an icon image for a JFrame. I do know its posible, because, let me say, I am NOT digging the java logo.
Well if I just hava to use a Frame object I will.
Can someone tell me, I know its possible!

Use an ImageIcon.
ImageIcon icon = new ImageIcon( pathToIcon );
yourFrame.setIconImage(icon.getImage());
Good Luck!

First, you have to have an image file on your computer. It can be named anything. For this example, we will call this one "pic.jpg".
Next, you need to include it in the files that your application is using. For example, if you're using NetBeans, you simply click on "Files" in the left hand side of the IDE (not File as in the menu, mind you). Drag the picture's file over to the folder that houses the main package. This will include it for available use in the code.
Inside the method where you define the JFrame, you can create an image like this:
Image frameImage = new ImageIcon("pic.jpg").getImage();
You can now set it as the IconImage for the frame like this:
JFrame frame = new JFrame("Title");
frame.setIconImage(frameImage);
Hope that's helpful.
Note: the reason that the Image object has to be created like this is because Image is abstract and cannot be instantiated by saying new Image();
Props to you, btw, kid. I wish I would have started learning programming when I was your age. Keep at it!

You can do the following.
public Test {
public static void main(String[] args) {
JFrame frame = new JFrame("My Frame");
frame.setIconImage(new ImageIcon(Test.class.getResource("image.png"));
frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
frame.setVisible(true);
frame.setSize(100, 100);
//other stuffs....
}
}

How to close JFrame?

I have the main application frame. If user clicks the button he gets a new frame which has some chart in it. Now if I want to close that chart both chart and main application closes. How can I distinguish those two closings. Certainly I don't want my application to be closed after closing the frame in which I put chart.
Here's the code of the chart frame.
chartBttn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
final ShowChart sc = new ShowChart("Reserve Selection", getUtilExperiments() );
sc.pack();
RefineryUtilities.centerFrameOnScreen(sc);
sc.setVisible(true);
sc.setDefaultCloseOperation(ShowChart.DISPOSE_ON_CLOSE);
}
});

You can use the dispose() method. Or you can call setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); on the JFrame.

If I understood you correctly on your new JFrame build a method for your close button or X window button with:
setVisible(false);
dispose();
Otherwise please post your code on creating the new JFrame etc.

Certainly I don't want my application to be closed after closing the frame in which I put chart.
1) don't create lots of JFrames on the fly, create JFrame only once and re-use that for next usage(s), then
call only for visibility setVisible(false/true) with setDefaultCloseOperation(JFrame.NOTHING_ON_CLOSE)
or very simple workaround
setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE)
2) or JDialog with setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE)
3) NOTICE: but in this case isn't possible close the current JVM instance, you have to add JButton or JMenu/JMenuItem which accelerate for System.exit(1)

simply use super.dispose(); for closing previous jframe

Frame Showing Problem

I have made one project which is showing the inventory of the stock of one store.
In that inventory the software should store data of the products with their images.
There is one problem...
Bcz of the lots of stock, the screen on which is image is loading taking a lot of time.
So, i thought i should give the frame in which there will be on label which will show the "Loading Software".
But now when i am setting visible = true for that frame, but bcz of that images screen class loading problem my frame is not showing correctly. I have put screen shot, now my code.
JFrame f;
try{
f = new JFrame("This is a test");
f.setSize(300, 300);
Container content = f.getContentPane();
content.setBackground(Color.white);
content.setLayout(new FlowLayout());
JLabel jl = new JLabel();
jl.setText("Loading Please Wait....");
content.add(jl);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}catch(Exception e){
e.printStackTrace();
}
initComponents();
try {
addInverntory = new AddInventoryScreen();
showstock = new showStock(); // this class will take big time.
mf = new mainForm();
f.setVisible(false);
}catch (Exception ex) {
ex.printStackTrace();
}
How Can show some message that, other class is loading or "Loading Software" kind of thing in this situation.
Just For the know....this class is not screen on which the image will load.

It's hard to answer this because it's not clear what the effects (Swing-wise) are of the calls to new AddInventoryScreen(); and new showStock();. You should only touch the UI that the user sees right at the end (when all the processing is done).
You should really spin off methods that will take a long time into their own Thread (see SwingWorker. There are alternatives for Java 5.0). That way, the UI won't be blocked while it's processing.
Maybe what you want is a Splash Screen?

Try calling validate(); and pack(); methods before calling f.setVisible(true);
Your code can be
validate();
pack();
f.setVisible(false);

I think one big problem in your code (maybe not the only one however) is the fact that you should use a different thread for long operations.
GUI operations (creating swing components, adding them to panels, changing labels...) are to be performed exclusively in the "EDT" and must be short (typically, less than 100ms or even 50ms).
Long operations can be easily done by another thread if you use the SwingWorker API (part of JDK 1.6).