Format Checking in Java

Hello,
Many a times, i encountered one problem that, How do we check whether the input by user is in correct format or not?
While using SWING, i'm placing one text box and is prompting user to enter "Username". But user just typed some numeric value and then submitted. Then i got a exception.
Without catching this exception, is there any class that provide me the facility to check the format before submitting itself?
thanks in advance
Renjith

Hello,
Many a times, i encountered
one problem that, How do we check whether the input
by user is in correct format or not?
While using SWING, i'm placing
one text box and is prompting user to enter
"Username". But user just typed some numeric value
and then submitted. Then i got a exception.Why can't a user name consist of numerical values?
Without catching this exception,
is there any class that provide me the facility to
check the format before submitting itself?
thanks in advance
RenjithUse a formatted text field:
http://java.sun.com/docs/books/tutorial/uiswing/components/formattedtextfield.html

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