public class QuickNotepadToolPanel extends JPanel
{
    private QuickNotepad pad;
    private JLabel label;

    public QuickNotepadToolPanel(QuickNotepad qnpad)
    {
        pad = qnpad;
        JToolBar toolBar = new JToolBar();
        toolBar.setFloatable(false);

        toolBar.add(makeCustomButton("quicknotepad.choose-file",
            new ActionListener() {
                public void actionPerformed(ActionEvent evt) {
                    QuickNotepadToolPanel.this.pad.chooseFile();
                }
            }));
        toolBar.add(makeCustomButton("quicknotepad.save-file",
            new ActionListener() {
                public void actionPerformed(ActionEvent evt) {
                    QuickNotepadToolPanel.this.pad.saveFile();
                }
            }));
        toolBar.add(makeCustomButton("quicknotepad.copy-to-buffer",
            new ActionListener() {
                public void actionPerformed(ActionEvent evt) {
                    QuickNotepadToolPanel.this.pad.copyToBuffer();
                }
            }));
        label = new JLabel(pad.getFilename(),
            SwingConstants.RIGHT);
        label.setForeground(Color.black);
        label.setVisible(jEdit.getProperty(
            QuickNotepadPlugin.OPTION_PREFIX
            + "show-filepath").equals("true"));
        this.setLayout(new BorderLayout(10, 0));
        this.add(BorderLayout.WEST, toolBar);
        this.add(BorderLayout.CENTER, label);
        this.setBorder(BorderFactory.createEmptyBorder(0, 0, 3, 10));
    }

    ...

}