NetBeans中如何显示对话框? //范例:显示一个向导对话框.Dialog dialog = DialogDisplayer.getDefault().createDialog(wizardDescriptor);dialog.setVisible(true);dialog.toFront(); //显示一个错误信息框DialogDisplayer.getDefault().notify(new NotifyDescriptor.Message("数据库连接出错.请确认数据库连接配置正确.", NotifyDescriptor.ERROR_MESSAGE));