How to control character input in java dialog boxes?

Question

For example my variable was string and I just want the users can only input numbers? This was my code
tempStr = JOptionPane.ShowInputDialog("Age: ", JOptionPane.QUESTION_MESSAGE);

Answer 1

a) the user can enter anything and you check if the string contains only numbers.
If yes, continue with the program. If not, show a error message box and ask for age again.

b)
You could add a keylistener to your showInputDialog().
I think it should be possible to prevent the user entering nondigits using the keycode of the keyevent.

I think the best is you describe exactly how you imagine it and I try to help you with the code.

Answer 2

Jason Cuerbo

Here are two sample codes:

https://code.sololearn.com/cOVMncfFRe8L/?ref=app
https://code.sololearn.com/cYOCCt8GEn2h/?ref=app

Hope it helps. If you have questions just ask :)

Answer 3

Thank you so much, Denise.

Answer 4

Jason Cuerbo Your welcome :)

Answer 5

Thank you so much. I will describe it the best I can.

So our teacher give us a task to make a program about enrollment. I was only having a hard time in the age part

At first
tempStr = JOptionPane.ShowInputDialog("Age: ", JOptionPane.QUESTION_MESSAGE);
age = integer.parseInt(tempStr);

But when i input any character that is not integer it gives an error. I want that the users can only input >=15 and <=85 numbers. Our teacher said that research about keypressed or control character input but I couldn't find any. I think that my teacher was saying about B.