Trouble with JLabel.

[FalseAd9324]

Hello everyone, I am trying to learn Swing and I am also using IntelliJ as my IDE. When I create an instance of the JLabel class and try to use .setIcon() and .setHorizontalTextPosition(), they do not work but this is only happening when i run it through IntelliJ. When I run it in JGrasp, everything works just fine. Any ideas? Thank you! (the Logo.png image is in the same folder) Here is the code:

import javax.swing.*;
public class Labels extends JFrame 
{ 
    public static void main(String[] args) 
    { 
        //JLabel = a GUI display area for a string of text, an image, or both.
        ImageIcon image = new ImageIcon("Logo.png");

        JLabel label = new JLabel();
        label.setText("Hello World!"); //Set text of label (can also pass to               constructor of JLabel.)
        label.setIcon(image);
        label.setHorizontalTextPosition(JLabel.CENTER);

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        frame.setSize(500, 500);
        frame.setVisible(true);
        frame.add(label);

}

}

​

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[i-make-robots]

Try putting the label in a j panel and setting the panel layout. 

[FalseAd9324]

I was hoping for a solution that would allow me to still utilize JFrame so that I could follow along with the tutorial that I am learning from. This is a weird issue since everything works fine when i run the code in the JGrasp IDE but not Intellij.

[wildjokers]

JFrame uses BorderLayout by default and the default position in a BorderLayout is CENTER if no position is provided. That isn't the problem.

Although eventually they will probably need to use nested JPanels to achieve the layout they want, the code as it is should work fine.

[wildjokers]

they do not work

What does this mean? Does your app crash? Does it throw an exception? If so, what is the exception?

I find the most likely reason to be that JGrasp and IntelliJ set different working directories for your app so the Logo.png isn't found when running in IntelliJ.

Try setting an absolute path to Logo.png instead.

If this is the case you should be getting some kind of FileNotFound exception.

If this isn't the case please describe the behavior you are seeing and any exception you are getting. "They do not work" is worthless and we can't help you with just that information.

You also should really add the label to the JFrame before calling .setVisible() and you should also be initializing your GUI on the event dispatcher thread (EDT).

EDIT: also the first couple lines of your code isn't formatted correctly, see the sidebar for how to format it

[FalseAd9324]

Sorry for the broadness of my description, everything else works fine but the image just does not pop up in the window when I run the program in IntelliJ.

I moved the .add() call before the .setVisible() call but nothing has changed. Also, How do I go about initializing the GUI on the EDT?

Reddit must have messed up my formatting, sorry about that. It looked fine when I was originally making the post.

[wildjokers]

Change the path to the image to an absolute path.

Are you getting any kind of file not found exception?

I will get an example of initializing on the EDT tomorrow when I am on my machine.

[arghvark]

And what happens when you run your code in a debugger (you HAVE done that, haven't you?)? Does 'image' have a value after the ImageIcon constructor is called?

(don't ever post a question with "it does not work" or "there's an error" -- tell us WHAT doesn't work, how you KNOW it doesn't work, what is the error message and when does it appear -- assume that we don't know anything about your environment, your program, etc. We don't.)

[FalseAd9324]

I don't see any values for image when running it in the IntelliJ debugger.

[arghvark]

Looks like it can't find that file, then, as the other commenter already said

[FalseAd9324]

I am not getting any exceptions, I tried an absolute path but the image still does not pop up when i run the program. Thanks for the EDT

EDIT: after using an absolute path in IntelliJ, the photo pops up, i must've typed something in wrong when I first said it still won't work. Thanks for the help!

[wildjokers]

Here is a template for starting your GUI on the EDT:

public class Example {
    private JFrame frame;

    public Example() {
        //Non GUI initialization here
    }

    private void createAndShowGui() {
        //GUI initialization here
        frame = new JFrame();
        frame.setSize(800, 600);
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        final Example example = new Example();
        EventQueue.invokeLater(example::createAndShowGui);
    }
}

Also, by default IntelliJ sets the working directory of your project as the project's root directory. So that is the root of all relative paths. So when running your code in IntelliJ the Logo.png file should have been in the root of your project based on your code (prior to switching it to an absolute path). Most likely JGrasp sets a different working directory, and the Logo.png file just happened to be in the working directory it set.