How to Load an Image Without Freezing Your Java Swing Form?

How to Display an Image Without Freezing the Form

In your code, when you click the button, the image loading process blocks the event dispatch thread, causing the form to freeze temporarily. To avoid this, you can use a separate thread to perform the image loading in the background.

Solution using javax.swing.SwingWorker

The javax.swing.SwingWorker class allows you to run a task in a separate thread while still updating the user interface (UI) from the task. Here's how you can use it to resolve your issue:

In your "client_Trackbus" class:

 SwingWorker<Image, Void> imageLoader = new SwingWorker<Image, Void>() {

     @Override
     protected Image doInBackground() throws Exception {
         // Load the image from URL in a separate thread
         URL imageURL = new URL("http://www.huddletogether.com/projects/lightbox2/images/image-2.jpg");
         Image image = Toolkit.getDefaultToolkit().createImage(imageURL);
         return image;
     }

     @Override
     protected void done() {
         try {
             // Display the loaded image on the panel
             ImageIcon icon = new ImageIcon(get());
             label.setIcon(icon);
             jPanel1.add(label);

             // Resize the panel to fit the image
             jPanel1.setSize(label.getPreferredSize());

             // Update the form
             getContentPane().add(jPanel1);
             revalidate();
             repaint();
         } catch (Exception ex) {
             // Handle any exceptions here
         }
     }
 };

 // Start the image loading task in the background
 imageLoader.execute();

This code creates a SwingWorker that runs in a separate thread. The doInBackground() method loads the image from the URL without blocking the event dispatch thread. When the image is loaded, the done() method is called on the event dispatch thread, where the image is displayed and the form is updated. This approach allows the form to remain responsive while the image is being loaded.

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