Keybinding JTabbedPane

Det kan sikkert gøres på mange måder, men lidt google fumleri ledte mig til følgende:

package november;

import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.SwingUtilities;

public class TabPanFun extends JFrame implements KeyListener {
    private static final int NOTABS = 5;
    private JTabbedPane tabs;
    private int curtab = 0;
    public TabPanFun() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setTitle("Tabbing demo");
        setLayout(new BorderLayout());
        tabs = new JTabbedPane();
        JPanel[] tab = new JPanel[NOTABS];;
        for(int i = 0; i < NOTABS; i++) {
            tab[i] = new JPanel();
            tab[i].setLayout(new BorderLayout());
            JLabel lbl = new JLabel();
            lbl.setFont(new Font(Font.SERIF, Font.PLAIN, 72));
            lbl.setText("I am tab #" + (i + 1));
            tab[i].add(lbl, BorderLayout.CENTER);
            tabs.addTab("tab" + (i + 1), tab[i]);
        }
        tabs.setFocusTraversalKeysEnabled(false);
        tabs.addKeyListener(this);
        getContentPane().add(tabs, BorderLayout.CENTER);
        setSize(600, 400);
    }
    @Override
    public void keyPressed(KeyEvent e) {
        if(e.getModifiers() == KeyEvent.CTRL_MASK
          && e.getKeyCode() == KeyEvent.VK_TAB) {
            curtab = (curtab + 1) % NOTABS;
            tabs.setSelectedIndex(curtab);
        } else if(e.getModifiers() == (KeyEvent.CTRL_MASK | KeyEvent.SHIFT_MASK)
                  && e.getKeyCode() == KeyEvent.VK_TAB) {
            curtab = (curtab - 1 + NOTABS) % 5;
            tabs.setSelectedIndex(curtab);
        }
    }
    @Override
    public void keyReleased(KeyEvent e) {
    }
    @Override
    public void keyTyped(KeyEvent e) {
    }
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame f = new TabPanFun();
                f.setVisible(true);
            }
        });
    }
}

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