动态添加元素到工具栏（Java Swing）

Question

我必须向其他人开发的Java桌面应用程序工具栏添加一些新元素。 我从未使用过Java桌面应用程序。

现在是工具栏

这应该是

由于我没有Java Swing的经验，所以我不知道如何编辑代码。

这是生成工具栏的代码：

public class Window extends JFrame implements Runnable {

....
  private final JToolBar toolbar;
    private final JToolBar toolbar1;
    private final JPanel fbar;
    private final JTextField formulaBar;
    private JLabel barCaption;
    JMenuBar menuBar;
    RibbonBar Ribbon;

    toolbar = new JToolBar();
    toolbar1 = new JToolBar();
    fbar = new JPanel();
    formulaBar = new JTextField(70);
    menuBar = new JMenuBar();
    Ribbon = new RibbonBar(this);

        toolbar.add(fbar);

        formulaBar.setSize(500, 25);
        formulaBar.setFont(new Font("Arial", Font.PLAIN, 12));
           formulaBar.setBorder(BorderFactory.createCompoundBorder(formulaBar.getBorder(), BorderFactory.createEmptyBorder(0, 5, 0, 5)));

 fbar.setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
        fbar.setLayout(new GridBagLayout());
        GridBagConstraints c = new GridBagConstraints();

        //natural height, maximum width
        c.fill = GridBagConstraints.HORIZONTAL;
        c.gridx = 0;
        c.gridy = 0;
        c.ipadx = 0;
        fbar.add(Ribbon, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.gridx = 1;
        c.gridy = 0;
        c.ipadx = 0;
        //barCaption = new JLabel(" Formula :", SwingConstants.CENTER);
        barCaption = new JLabel("  ", SwingConstants.CENTER);

        barCaption.setBorder(BorderFactory.createCompoundBorder(barCaption.getBorder(), BorderFactory.createEmptyBorder(0, 17, 0, 17)));
        fbar.add(barCaption, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.weightx = 0.5;
        c.gridx = 2;
        c.gridy = 0;
        fbar.add(formulaBar, c);
        c.fill = GridBagConstraints.HORIZONTAL;
        c.weightx = 0;
        c.gridx = 0;
        c.gridy = 0;

        toolbar.setFloatable(false);
        setJMenuBar(menuBar);
        add(toolbar, BorderLayout.NORTH);
...
}

有人可以帮助我吗？