Another question...how do i test an alphabetical input?

Question

When a user enters letters instead of numbers the program should output a message saying "You can't type a letter". This is not working.
Anybody know what i might of done wrong in my code?
                   if (amount < 0) {
                       theOutput.setText("Try again");
                    else {
                        theStock.addStock(pn, amount);
                        Product pr = theStock.getDetails( pn );
                        theAction.setText(               
                        pr.getDescription() + " : " + 
                        theMoney.format(pr.getPrice()) +
                        " (" + pr.getQuantity() + ")" );
                catch (NumberFormatException e) {
                    theOutput.setText("You can't type a letter");Edited by: LevelSix on 17-Feb-2010 04:19

Answer 1

LevelSix wrote:
flounder wrote:
Of course you get an error. What heck is "([a-zA-Z])" supposed to do?Sorry, can you tell me how to write it properly.Difficult to say since the above ([a-zA-Z])" is nonsense.
If you have a compound boolean in the if statement, each boolean should stand be able to stand on it's own. All the statements should be bound within a parenthesis. Again, read the tutorials on if statements for more.
It's supposed to see if an alphabetical, of any case, letter has been entered.
Please don't get angry at me, i'm not trying cause any trouble.No one's mad at you, but you are somewhat reluctant to provide the details that have been requested above.