GUI Image Display Error

Question

So I'm new to Java learning some basics from videos on YouTube, I'm learning to make a GUI/Window and at the moment I'm trying to get iamges to be displayed but I'm not sure if code is wrong/old or the images are not in the right spot/location. Here's what I've written up so far. Help would be much appreciated. Please and Thank you.

import java.awt.*;
import javax.swing.*;

public class FirstGUI extends JFrame {

    private static Object out;
    private JLabel label;
    private JButton button;
    private JTextField textfield;
    
    private ImageIcon image1;
    private JLabel label1;
    
    private ImageIcon image2;
    private JLabel label2;
    
    
    public FirstGUI() {
        
        setLayout (new FlowLayout());
        
        label = new JLabel("Hi, I'm a label!");
        add(label);
        
        textfield = new JTextField(15);
        add(textfield);
        
        button = new JButton("Click me!");
        add(button);
        
        button = new JButton("No, CLICK ME!!");
        add(button);
        
        label = new JLabel("This is the end of the program?");
        add(label);
        
        
        
        image1 = new ImageIcon(getClass().getResource("Apiary.png"));
        label1 = new JLabel(image1);
        
        image2 = new ImageIcon(getClass().getResource("bee.png"));
        label2 = new JLabel(image2);
    }

    
    
    public static void main(String[] args) {

        FirstGUI gui = new FirstGUI();
        gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//*     gui.setSize(400, 400);
        gui.setVisible(true);
        gui.setTitle("Hello World");
        gui.pack();
        
        

    }

}

What I get in the errors are:

Exception in thread "main" java.lang.NullPointerException

at javax.swing.ImageIcon.(Unknown Source)

at FirstGUI.(FirstGUI.java:39)

at FirstGUI.main(FirstGUI.java:50)

NOTE: This worked before the image display code was added. – MattRivas Jul 06 '16 at 08:33 — MattRivas, Jul 06 '16 at 08:33

score 0 · Accepted Answer · answered Jul 06 '16 at 09:31

0

First you're not adding the labels to the frame, so even if that executes it won't show the image icons. So don't forget to add the labels to the frame:

add(label1);
add(label2);

Second I tried your code and it worked fine for me, it only printed the error you mentioned when I didn't import the image icon to the package i'm working in. For this you need to do this:

Right click on your src package-> import-> General -> File System and then click next and select the directory that contains the images, click Ok and then add the images you specified in the code.

answered Jul 06 '16 at 09:31

Gherbi Hicham

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I tried to do what you said I found out how to point the images and import them like you said, then I tried to add labels as you said and this is the part in the code I added it to. http://pastebin.com/ynfqiE5F But after Running it I get this error. Exception in thread "main" java.lang.NullPointerException at javax.swing.ImageIcon.(Unknown Source) at FirstGUI.(FirstGUI.java:39) at FirstGUI.main(FirstGUI.java:52) Sorry if the comment is late, I must be in a different time zone. – MattRivas Jul 07 '16 at 01:06
The code in pastebin.com/ynfqiE5F is different because it specifies the full URL( ` image1 = new ImageIcon(getClass().getResource("/FirstGUI/src/assets/images/Apiary.png"));) ` , just use the code you mentioned in question with just the name of the image , After you import the images Apiary.png and bee.png to the package that has the classes there will be no need to specify the full URL. – Gherbi Hicham Jul 07 '16 at 10:24
Ok I found the problem after all. It seems I'm not allowed to have the pictures in a folder, and has to be in the main directory. I wanted folders in it to keep organized. – MattRivas Jul 07 '16 at 13:48
Ok i'm glad you have finally figured it out, keep it up :) – Gherbi Hicham Jul 07 '16 at 13:53

GUI Image Display Error

1 Answers1