$\}$ catch $($MalformedURLException ex$)\{//$ Display an alert to the user Alert alert $=$ new Alert$($Alert$.$AlertType.ERROR, "Invalid URL entered: $"+$ ex$.$getMessage$(),$ ButtonType.OK$)$; alert.showAndWait$()$; return; $//$ Exit the method if an error occurs $\}$ catch $($IOException ex$)\{//$ Display an alert to the user Alert alert $=$ new Alert$($Alert$.$AlertType.ERROR, "IOException occurred: $"+$ ex$.$getMessage$(),$ ButtonType.OK$)$; alert.showAndWait$()$; return; $//$ Exit the method if an error occurs $\}$ catch $($Exception ex$)\{//$ Display an alert to the user Alert alert $=$ new Alert$($Alert$.$AlertType.ERROR, $"$An unexpected exception occurred: $"+$ ex$.$getMessage$(),$ ButtonType.OK$)$; alert.showAndWait$()$; return; $//$ Exit the method if an error occurs $\}$ ShowChart$("$f$1.$txt$","$f$2.$txt$")$;$\})$; $//$ Creates a GridPane layout and adds labels, text fields, and buttons to it$.$ GridPane pane $=$ new GridPane$()$; pane.setAlignment$($Pos$.$CENTER$)$; pane.setHgap$(15)$; pane.setVgap$(15)$; pane.add$($L$1,0,0)$; pane.add$($text$1,0,1)$; pane.add$($L$2,0,2)$; pane.add$($text$2,0,3)$; pane.add$($CompareButton$,0,4)$; pane.add$($ExitButton$,0,5)$; $//$Creates a scene with the specified GridPane and dimensions. Scene scene $=$ new Scene$($pane$,500,300)$; $//$Sets the stage title, scene, and shows the primary stage. primaryStage.setTitle$("$Website Comparison"$)$; primaryStage.setScene$($scene$)$; primaryStage.show$()$; $\}//$Defines a private method isValidURL that checks if a given string represents a valid URL private boolean isValidURL$($String url$)\{$ try $\{$ new URL$($url$)$; return true; $\}$ catch $($MalformedURLException e$)\{$ return false; $\}\}$

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