Swing message doesn't get displayed until after Runtime.getRuntime().exec() finishes execution

Question

I am new to Swing. I am trying to create a swing wrapper to allow the user to browse and select a folder, and that folder path is used as a command line parameter to a cons

Answer 1

It seems you're doing it all in one thread.

Use event dispatch thread to call your gui code.

private void onLaunchProgram(ActionEvent evt) {
        String strExecutableFilename = "MyExecutableProgam";
        String strSourceFolder = txtFolder.getText();
        String strCommand = strExecutableFilename + " " + strSourceFolder;
        ImageIcon icon = new ImageIcon("clock.gif");
        javax.swing.SwingUtilities.invokeLater(
            new Runnable() {
                 public void run() {
                     lblMessage.setText("Processing");
                     lblPic.setIcon(icon);
                 }
            });

        try {
            Process procCommand = Runtime.getRuntime().exec(strCommand);
            try {
                procCommand.waitFor();
            } catch (InterruptedException exception) {
                exception.printStackTrace();
            } finally {
            }

            javax.swing.SwingUtilities.invokeLater(
                new Runnable() {
                    public void run() {
                      lblMessage.setText("Finished");
                    }
                 });
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
        }
    }