This example displays the complete path of the current directory in the title whenever the current directory changes. 
    final JFileChooser chooser = new JFileChooser();
    
    // Initialize title with current directory
    File curDir = chooser.getCurrentDirectory();
    chooser.setDialogTitle(""+curDir.getAbsolutePath());
    
    // Add listener on chooser to detect changes to current directory
    chooser.addPropertyChangeListener(new PropertyChangeListener() {
        public void propertyChange(PropertyChangeEvent evt) {
            if (JFileChooser.DIRECTORY_CHANGED_PROPERTY.equals(evt.getPropertyName())) {
                File curDir = chooser.getCurrentDirectory();
    
                chooser.setDialogTitle(""+curDir.getAbsolutePath());
            }
        }
    }) ;