if(!getBuffer(evt).undo()) getView(evt).getToolkit().beep();
View view = getView(evt); if(!view.getTextArea().isEditable()) { view.getToolkit().beep(); return; }  if(!view.getBuffer().undo()) view.getToolkit().beep();
	public void actionPerformed(ActionEvent evt)	{		if(!getBuffer(evt).undo())			getView(evt).getToolkit().beep();	}