display message if input is alpha character?

[R17]

i'm asking input from users of type integer... but when my user types alpha characters... i get an error...

i want to display a message telling my users only numbers are acceptable?

 

[borbjo]

try {
int i = Integer.parseInt(inputFromUser);
} catch(NumberFormatException nfe) {
// user did not enter integer, do something here.
}