Once the string is received from the user, you need to check each character of that string to see if any of them is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. Then, if it is, you need to throw an appropriate exception. How can I check that is a number???
[ January 05, 2005: Message edited by: Dmitri Mayer ]