JTabbedPaneにタブを閉じるアイコンを追加

public class JTabbedPaneWithCloseIcons extends JTabbedPane {
  public JTabbedPaneWithCloseIcons() {
    super();
    addMouseListener(new MouseAdapter() {
      @Override public void mouseClicked(MouseEvent e) {
        tabClicked(e);
      }
    });
  }

  public void addTab(String title, Component component) {
    this.addTab(title, component, null);
  }

  public void addTab(String title, Component component, Icon extraIcon) {
    super.addTab(title, new CloseTabIcon(extraIcon), component);
  }

  private void tabClicked(MouseEvent e) {
    int index = getUI().tabForCoordinate(this, e.getX(), e.getY());
    if (index < 0) {
      return;
    }
    Rectangle rect = ((CloseTabIcon) getIconAt(index)).getBounds();
    if (rect.contains(e.getX(), e.getY())) {
      removeTabAt(index);
    }
  }
}