public void actionPerformed(ActionEvent e) { if (e.getSource() == top) { tabbedpane.setTabPlacement(JTabbedPane.TOP); } else if (e.getSource() == left) { tabbedpane.setTabPlacement(JTabbedPane.LEFT); } else if (e.getSource() == bottom) { tabbedpane.setTabPlacement(JTabbedPane.BOTTOM); } else if (e.getSource() == right) { tabbedpane.setTabPlacement(JTabbedPane.RIGHT); } }