Java™ Application Development on Linux - Dator

16.7 Getting Down to Cases: Designing a GUI for BudgetPro357244 ActionListener creatAction = new ActionListener()245 {246 public void247 actionPerformed(ActionEvent e)248 {249 Account child;250 // get the info via a Dialog (of sorts)251 if (askem == null) {252 askem = new AcctDialog(frame, "New Subaccount");253 } else {254 askem.clear();255 askem.setVisible(true);256 }257 String subName = askem.getName();258 String subAmnt = askem.getAmnt();259260 // if empty, assume the operation was cancelled, else:261 if ((subName != null) && (subName.length() > 0)) {262 child = current.createSub(subName, subAmnt);263 setStatus();264 model.fireTableDataChanged(); // notify the table265 }266 }267 };268 creat.addActionListener(creatAction);We defined the action for the View Subaccount button (as we said youcould) elsewhere in the program. Its action is defined in lines 54–75. Then online 271 we connect the action to the button. (We’ll get back to this button’saction, too, once we’ve discussed the JTable.) But after we’ve attached the action,we also disable the button (line 273).270 // function is to get selection from table and cd there271 view.addActionListener(cdAction);272 // but it starts off disabled, since there is no data yet273 view.setEnabled(false);In Swing, a button is either enabled or disabled. Enabled buttons are theactive ones on which you can click. Disabled buttons are grayed out and notresponsive to clicks. We can make a button either active or inactive with amethod on the button called setEnabled() whose argument is aboolean—true to enable the button, false to disable it. For example: