public void actionPerformed(ActionEvent e) {
   if ("disable".equals(e.getActionCommand())) {
     b2.setEnabled(false);
     b1.setEnabled(false);
     b3.setEnabled(true);
   } else {
     b2.setEnabled(true);
     b1.setEnabled(true);
     b3.setEnabled(false);
   }
 }
  public AdaptedCustomIconDemo() {
    Icon leftButtonIcon = new AdaptedArrowIcon(SwingConstants.RIGHT);
    Icon middleButtonIcon = createImageIcon("images/middle.gif", "the middle button");
    Icon rightButtonIcon = new AdaptedArrowIcon(SwingConstants.LEFT);

    b1 = new JButton("Disable middle button", leftButtonIcon);
    b1.setVerticalTextPosition(AbstractButton.CENTER);
    b1.setHorizontalTextPosition(AbstractButton.LEADING);
    b1.setMnemonic(KeyEvent.VK_D);
    b1.setActionCommand("disable");

    b2 = new JButton("Middle button", middleButtonIcon);
    b2.setVerticalTextPosition(AbstractButton.BOTTOM);
    b2.setHorizontalTextPosition(AbstractButton.CENTER);
    b2.setMnemonic(KeyEvent.VK_M);

    b3 = new JButton("Enable middle button", rightButtonIcon);
    // Use the default text position of CENTER, TRAILING (RIGHT).
    b3.setMnemonic(KeyEvent.VK_E);
    b3.setActionCommand("enable");
    b3.setEnabled(false);

    // Listen for actions on buttons 1 and 3.
    b1.addActionListener(this);
    b3.addActionListener(this);

    b1.setToolTipText("Click this button to disable the middle button.");
    b2.setToolTipText("This middle button does nothing when you click it.");
    b3.setToolTipText("Click this button to enable the middle button.");

    // Add Components to this container, using the default FlowLayout.
    add(b1);
    add(b2);
    add(b3);
  }