e901. getting the file-type icon of a file.txt

这里面包含了一百多个JAVA源文件

The icon displayed next to directories and filenames in a file chooser dialog can be retrieved and used in other applications. 
    JFileChooser chooser = new JFileChooser();
    
    // Create a File instance of the file
    File file = new File("filename.txt");
    
    // Get the icon
    Icon icon = chooser.getIcon(file);
    
    // Some sample code to display the icon in a window
    JLabel label = new JLabel(""+file);
    label.setIcon(icon);
    JFrame frame = new JFrame();
    frame.getContentPane().add(label, BorderLayout.CENTER);
    frame.pack();
    frame.setVisible(true);