Alert in JAVA FX

Question

I want to display an alert when a file already exists when trying to create the file with same name . I have not completed the code fully. I want to retrieve the button value Ye

Answer 1

Simply use the Alert class. It provides functionality for most yes/no dialogs that you ever need.

Alert alert = new Alert(AlertType.WARNING, 
                        "File already exists. Do you want to override?", 
                        ButtonType.YES, ButtonType.NO);

Optional<ButtonType> result = alert.showAndWait();
if (result.get() == ButtonType.YES){
    // ... user chose YES
} else {
    // ... user chose NO or closed the dialog
}

Also here is a good tutorial.

Answer 2

I usually make a method, and call it if certain conditions are not met. Ex:

if(condition)
      alert();



public void alert(){  //alert box

Alert alert = new Alert(AlertType.WARNING,"", ButtonType.YES, ButtonType.NO);  //new alert object
    alert.setTitle("Warning!");  //warning box title
    alert.setHeaderText("WARNING!!!");// Header
    alert.setContentText("File already exists. Overwrite?"); //Discription of warning
    alert.getDialogPane().setPrefSize(200, 100); //sets size of alert box 

    Optional<ButtonType> result = alert.showAndWait();
    if (result.get() == ButtonType.YES){
        // ... user chose YES
    } else {
        // ... user chose NO or closed the dialog
    }

}

I grabbed some code from Jhonny007, credit to him.