问如何在图形用户界面中使用GridLayout居中显示文本

EN

public class guiFrame {
    JLabel label;
    JMenuBar menubar;
    JTextArea area;

    public guiFrame() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(new Dimension(600,200));
        frame.getContentPane().setBackground(Color.BLACK);

        JPanel panel = new JPanel(new BorderLayout());
        panel.setLayout(new GridLayout(1, 2));
        frame.add(panel);

        JMenuBar menubar = new JMenuBar();
        frame.setJMenuBar(menubar);
        JMenu aenderFarb = new JMenu("Ändere Farbe");
        menubar.add(aenderFarb);
        JMenuItem blak = new JMenuItem("schwarz");
        JMenuItem whit = new JMenuItem("weiß");
        aenderFarb.add(blak);
        aenderFarb.add(whit);

        JTextArea area = new JTextArea("Hallo, Welt! Hier kann man Text reinschreiben...");
        panel.add(area);
        panel.setBackground(Color.BLACK);

        JLabel label = new JLabel("");
        label.setBackground(Color.BLACK);
        panel.add(label);
        frame.setVisible(true);
    }
}