I have an inputDialog but I would like to know if you could add events to that dialog since I do not want to enter letters and that when I press a letter I just do not write it I only have this
JOptionPane.showInputDialog(null, "Ingrese la cantidad a llevar: ");
Can you explain yourself better?
'by pressing a letter simply do not write it down'
For Java there is a library called JavaFX that through programs like Scene Builder, allows you to graphically associate a method with events like 'onclick', etc. You could use this to get input dialog into a method associated with an event.
You can use a KeyEvent, a keyboard event, add a condition, where you call the KeyEvent and compare it with the data type of the variable where you have to save the data.